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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 88.80% | 95.50%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 71,568 | $ 68,231
12 months or more | 946,081 | 1,071,609
Total | 1,017,649 | 1,139,840
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (654) | (1,202)
12 months or more | (95,071) | (129,956)
Total | (95,725) | (131,158)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 70,914 | 67,029
12 months or more | 851,010 | 941,653
Total | 921,924 | 1,008,682
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 1,951 | 1,396
12 months or more | 238,299 | 351,315
Total | 240,250 | 352,711
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (6) | (2)
12 months or more | (10,128) | (18,614)
Total | (10,134) | (18,616)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 1,945 | 1,394
12 months or more | 228,171 | 332,701
Total | 230,116 | 334,095
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 4,527 | 14,262
12 months or more | 285,485 | 288,445
Total | 290,012 | 302,707
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (223) | (192)
12 months or more | (39,139) | (50,851)
Total | (39,362) | (51,043)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 4,304 | 14,070
12 months or more | 246,346 | 237,594
Total | 250,650 | 251,664
Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 65,090 | 28,028
12 months or more | 401,088 | 416,270
Total | 466,178 | 444,298
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (425) | (994)
12 months or more | (45,706) | (60,428)
Total | (46,131) | (61,422)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 64,665 | 27,034
12 months or more | 355,382 | 355,842
Total | 420,047 | 382,876
Asset-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 0 | 24,545
12 months or more | 21,209 | 15,579
Total | 21,209 | 40,124
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | 0 | (14)
12 months or more | (98) | (63)
Total | (98) | (77)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 0 | 24,531
12 months or more | 21,111 | 15,516
Total | $ 21,111 | $ 40,047

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