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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 96.80% | 97.30%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 18,667 | $ 35,971
12 months or more | 1,200,303 | 1,234,191
Total | 1,218,970 | 1,270,162
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (256) | (1,544)
12 months or more | (142,363) | (136,221)
Total | (142,619) | (137,765)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 18,411 | 34,427
12 months or more | 1,057,940 | 1,097,970
Total | 1,076,351 | 1,132,397
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 2,785 | 3,761
12 months or more | 351,685 | 361,038
Total | 354,470 | 364,799
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1) | (5)
12 months or more | (27,574) | (26,567)
Total | (27,575) | (26,572)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 2,784 | 3,756
12 months or more | 324,111 | 334,471
Total | 326,895 | 338,227
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 11,081 | 16,154
12 months or more | 297,619 | 284,397
Total | 308,700 | 300,551
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (234) | (1,250)
12 months or more | (49,574) | (47,040)
Total | (49,808) | (48,290)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 10,847 | 14,904
12 months or more | 248,045 | 237,357
Total | 258,892 | 252,261
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 2,869 | 16,056
12 months or more | 479,271 | 500,763
Total | 482,140 | 516,819
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (18) | (289)
12 months or more | (64,756) | (61,847)
Total | (64,774) | (62,136)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 2,851 | 15,767
12 months or more | 414,515 | 438,916
Total | 417,366 | 454,683
Asset-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 1,932 | 0
12 months or more | 71,728 | 87,993
Total | 73,660 | 87,993
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (3) | 0
12 months or more | (459) | (767)
Total | (462) | (767)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 1,929 | 0
12 months or more | 71,269 | 87,226
Total | $ 73,198 | $ 87,226

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