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v3.23.3

Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 98.90% | 97.40%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 46,468 | $ 416,778
12 months or more | 1,265,661 | 981,280
Total | 1,312,129 | 1,398,058
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (3,078) | (21,324)
12 months or more | (185,319) | (153,300)
Total | (188,397) | (174,624)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 43,390 | 395,454
12 months or more | 1,080,342 | 827,980
Total | 1,123,732 | 1,223,434
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 4,781 | 144,305
12 months or more | 370,697 | 249,424
Total | 375,478 | 393,729
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (6) | (6,953)
12 months or more | (35,802) | (29,906)
Total | (35,808) | (36,859)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 4,775 | 137,352
12 months or more | 334,895 | 219,518
Total | 339,670 | 356,870
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 25,808 | 94,277
12 months or more | 287,629 | 225,019
Total | 313,437 | 319,296
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (2,565) | (6,257)
12 months or more | (66,825) | (55,419)
Total | (69,390) | (61,676)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 23,243 | 88,020
12 months or more | 220,804 | 169,600
Total | 244,047 | 257,620
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 15,879 | 139,314
12 months or more | 518,517 | 454,357
Total | 534,396 | 593,671
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (507) | (6,883)
12 months or more | (81,637) | (66,950)
Total | (82,144) | (73,833)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 15,372 | 132,431
12 months or more | 436,880 | 387,407
Total | 452,252 | 519,838
Asset-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 0 | 38,882
12 months or more | 88,818 | 52,480
Total | 88,818 | 91,362
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | 0 | (1,231)
12 months or more | (1,055) | (1,025)
Total | (1,055) | (2,256)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 0 | 37,651
12 months or more | 87,763 | 51,455
Total | $ 87,763 | $ 89,106

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