Biggest changeThe following table provides the tax equivalent basis yield or rate for each component of the tax equivalent net interest margin for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Average Yield/ Average Yield/ Average Yield/ Balance Interest Rate Balance Interest Rate Balance Interest Rate Assets Interest-earning assets: Federal funds sold and securities purchased under reverse repurchase agreements $ 1,492 $ 80 5.36 % $ 1,753 $ 74 4.22 % $ 79 $ — — Securities available for sale: Taxable 2,090,201 35,359 1.69 % 2,932,054 38,799 1.32 % 2,573,533 30,453 1.18 % Nontaxable 4,657 182 3.91 % 4,997 195 3.90 % 5,166 199 3.85 % Securities held to maturity: Taxable 1,454,450 30,741 2.11 % 911,010 20,918 2.30 % 423,763 8,245 1.95 % Nontaxable 1,854 81 4.37 % 5,623 227 4.04 % 12,765 495 3.88 % PPP loans — — — 14,868 639 4.30 % 350,668 36,726 10.47 % Loans (LHFS and LHFI) 12,801,531 788,719 6.16 % 11,236,388 485,246 4.32 % 10,377,941 375,330 3.62 % Other earning assets 728,181 37,135 5.10 % 907,414 8,080 0.89 % 1,825,134 2,767 0.15 % Total interest-earning assets 17,082,366 892,297 5.22 % 16,014,107 554,178 3.46 % 15,569,049 454,215 2.92 % Other assets 1,718,058 1,567,921 1,599,114 Allowance for credit losses (125,942 ) (104,138 ) (110,170 ) Total Assets $ 18,674,482 $ 17,477,890 $ 17,057,993 Liabilities and Shareholders' Equity Interest-bearing liabilities: Interest-bearing demand deposits $ 4,871,977 121,138 2.49 % $ 4,585,955 16,409 0.36 % $ 4,096,746 4,906 0.12 % Savings deposits 3,838,791 28,605 0.75 % 4,579,742 9,654 0.21 % 4,622,167 7,912 0.17 % Time deposits 2,691,682 96,208 3.57 % 1,153,983 3,006 0.26 % 1,287,663 4,127 0.32 % Federal funds purchased and securities sold under repurchase agreements 410,945 20,419 4.97 % 283,328 6,127 2.16 % 172,782 232 0.13 % Other borrowings 984,315 50,441 5.12 % 198,672 4,963 2.50 % 125,554 1,037 0.83 % Subordinated notes 123,364 4,751 3.85 % 123,144 4,751 3.86 % 122,933 4,752 3.87 % Junior subordinated debt securities 61,856 4,392 7.10 % 61,856 2,215 3.58 % 61,856 1,194 1.93 % Total interest-bearing liabilities 12,982,930 325,954 2.51 % 10,986,680 47,125 0.43 % 10,489,701 24,160 0.23 % Noninterest-bearing demand deposits 3,532,134 4,452,046 4,531,642 Other liabilities 589,320 434,310 266,499 Shareholders' equity 1,570,098 1,604,854 1,770,151 Total Liabilities and Shareholders' Equity $ 18,674,482 $ 17,477,890 $ 17,057,993 Net Interest Margin 566,343 3.32 % 507,053 3.17 % 430,055 2.76 % Less tax equivalent adjustments: Investments 55 89 146 Loans 13,410 12,256 11,558 Net Interest Margin per Consolidated Statements of Income $ 552,878 $ 494,708 $ 418,351 42 The table below shows the change from year to year for each component of the tax equivalent net interest margin in the amount generated by volume changes and the amount generated by changes in the yield or rate (tax equivalent basis) for the periods presented ($ in thousands): 2023 Compared to 2022 2022 Compared to 2021 Increase (Decrease) Due To: Increase (Decrease) Due To: Yield/ Yield/ Volume Rate Net Volume Rate Net Interest earned on: Federal funds sold and securities purchased under reverse repurchase agreements $ (12 ) $ 18 $ 6 $ — $ 74 $ 74 Securities available for sale: Taxable (12,720 ) 9,280 (3,440 ) 4,508 3,838 8,346 Nontaxable (13 ) — (13 ) (7 ) 3 (4 ) Securities held to maturity: Taxable 11,669 (1,846 ) 9,823 10,962 1,711 12,673 Nontaxable (164 ) 18 (146 ) (287 ) 19 (268 ) PPP loans (319 ) (320 ) (639 ) (22,339 ) (13,748 ) (36,087 ) Loans, net of unearned income (LHFS and LHFI) 74,788 228,685 303,473 32,932 76,984 109,916 Other earning assets (1,898 ) 30,953 29,055 (2,008 ) 7,321 5,313 Total interest-earning assets 71,331 266,788 338,119 23,761 76,202 99,963 Interest paid on: Interest-bearing demand deposits 1,093 103,636 104,729 648 10,855 11,503 Savings deposits (1,806 ) 20,757 18,951 (73 ) 1,815 1,742 Time deposits 8,831 84,371 93,202 (399 ) (722 ) (1,121 ) Federal funds purchased and securities sold under repurchase agreements 3,676 10,616 14,292 233 5,662 5,895 Other borrowings 35,951 9,527 45,478 881 3,045 3,926 Subordinated notes 10 (10 ) — 9 (10 ) (1 ) Junior subordinated debt securities — 2,177 2,177 — 1,021 1,021 Total interest-bearing liabilities 47,755 231,074 278,829 1,299 21,666 22,965 Change in net interest income on a tax equivalent basis $ 23,576 $ 35,714 $ 59,290 $ 22,462 $ 54,536 $ 76,998 The change in interest due to both volume and yield or rate has been allocated to change due to volume and change due to yield or rate in proportion to the absolute value of the change in each.
Biggest changeOther interest expense decreased $33.2 million, or 55.7%, while the rate on other borrowings decreased to 4.60% compared to 5.09%, when 2024 is compared to 2023, principally due to a decrease in the amount of short-term FHLB advances obtained from the FHLB of Dallas during the year. 43 The following table provides the tax equivalent basis yield or rate for each component of the tax equivalent net interest margin for the periods presented ($ in thousands): Years Ended December 31, 2024 2023 2022 Average Yield/ Average Yield/ Average Yield/ Balance Interest Rate Balance Interest Rate Balance Interest Rate Assets Interest-earning assets: Securities available for sale: Taxable $ 1,789,685 $ 55,932 3.13 % $ 2,090,201 $ 35,359 1.69 % $ 2,932,054 $ 38,799 1.32 % Nontaxable — — — 4,657 182 3.91 % 4,997 195 3.90 % Securities held to maturity: Taxable 1,388,531 29,989 2.16 % 1,454,450 30,741 2.11 % 911,010 20,918 2.30 % Nontaxable 112 5 4.46 % 1,854 81 4.37 % 5,623 227 4.04 % PPP loans — — — — — — 14,868 639 4.30 % Loans (LHFS and LHFI) 13,283,829 857,307 6.45 % 12,801,531 788,719 6.16 % 11,236,388 485,246 4.32 % Other earning assets 548,336 29,667 5.41 % 729,673 37,215 5.10 % 909,167 8,154 0.90 % Total interest-earning assets 17,010,493 972,900 5.72 % 17,082,366 892,297 5.22 % 16,014,107 554,178 3.46 % Other assets 1,685,971 1,718,058 1,567,921 Allowance for credit losses (148,564 ) (125,942 ) (104,138 ) Total Assets $ 18,547,900 $ 18,674,482 $ 17,477,890 Liabilities and Shareholders' Equity Interest-bearing liabilities: Interest-bearing demand deposits $ 5,348,043 148,888 2.78 % $ 4,871,977 121,138 2.49 % $ 4,585,955 16,409 0.36 % Savings deposits 3,506,829 30,121 0.86 % 3,838,791 28,605 0.75 % 4,579,742 9,654 0.21 % Time deposits 3,331,543 150,372 4.51 % 2,691,682 96,208 3.57 % 1,153,983 3,006 0.26 % Federal funds purchased and securities sold under repurchase agreements 398,884 20,154 5.05 % 410,945 20,419 4.97 % 283,328 6,127 2.16 % Other borrowings 388,266 17,146 4.42 % 984,315 50,441 5.12 % 198,672 4,963 2.50 % Subordinated notes 123,584 4,751 3.84 % 123,364 4,751 3.85 % 123,144 4,751 3.86 % Junior subordinated debt securities 61,856 4,477 7.24 % 61,856 4,392 7.10 % 61,856 2,215 3.58 % Total interest-bearing liabilities 13,159,005 375,909 2.86 % 12,982,930 325,954 2.51 % 10,986,680 47,125 0.43 % Noninterest-bearing demand deposits 3,179,641 3,532,134 4,452,046 Other liabilities 383,627 589,320 434,310 Shareholders' equity 1,825,627 1,570,098 1,604,854 Total Liabilities and Shareholders' Equity $ 18,547,900 $ 18,674,482 $ 17,477,890 Net Interest Margin 596,991 3.51 % 566,343 3.32 % 507,053 3.17 % Less tax equivalent adjustments: Investments 1 55 89 Loans 12,569 13,410 12,256 Net Interest Margin per Consolidated Statements of Income $ 584,421 $ 552,878 $ 494,708 44 The table below shows the change from year to year for each component of the tax equivalent net interest margin in the amount generated by volume changes and the amount generated by changes in the yield or rate (tax equivalent basis) for the periods presented ($ in thousands): 2024 Compared to 2023 2023 Compared to 2022 Increase (Decrease) Due To: Increase (Decrease) Due To: Yield/ Yield/ Volume Rate Net Volume Rate Net Interest earned on: Securities available for sale: Taxable $ (5,721 ) $ 26,294 $ 20,573 $ (12,720 ) $ 9,280 $ (3,440 ) Nontaxable (91 ) (91 ) (182 ) (13 ) — (13 ) Securities held to maturity: Taxable (1,449 ) 697 (752 ) 11,669 (1,846 ) 9,823 Nontaxable (78 ) 2 (76 ) (164 ) 18 (146 ) PPP loans — — — (319 ) (320 ) (639 ) Loans, net of unearned income (LHFS and LHFI) 30,490 38,098 68,588 74,788 228,685 303,473 Other earning assets (9,700 ) 2,152 (7,548 ) (1,910 ) 30,971 29,061 Total interest-earning assets 13,451 67,152 80,603 71,331 266,788 338,119 Interest paid on: Interest-bearing demand deposits 12,660 15,090 27,750 1,093 103,636 104,729 Savings deposits (2,570 ) 4,086 1,516 (1,806 ) 20,757 18,951 Time deposits 25,699 28,465 54,164 8,831 84,371 93,202 Federal funds purchased and securities sold under repurchase agreements (596 ) 331 (265 ) 3,676 10,616 14,292 Other borrowings (27,163 ) (6,132 ) (33,295 ) 35,951 9,527 45,478 Subordinated notes 10 (10 ) — 10 (10 ) — Junior subordinated debt securities — 85 85 — 2,177 2,177 Total interest-bearing liabilities 8,040 41,915 49,955 47,755 231,074 278,829 Change in net interest income on a tax equivalent basis $ 5,411 $ 25,237 $ 30,648 $ 23,576 $ 35,714 $ 59,290 The change in interest due to both volume and yield or rate has been allocated to change due to volume and change due to yield or rate in proportion to the absolute value of the change in each.