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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 94.30% | 97.30%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 51,448 | $ 35,971
12 months or more | 1,092,127 | 1,234,191
Total | 1,143,575 | 1,270,162
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (246) | (1,544)
12 months or more | (107,491) | (136,221)
Total | (107,737) | (137,765)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 51,202 | 34,427
12 months or more | 984,636 | 1,097,970
Total | 1,035,838 | 1,132,397
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 0 | 3,761
12 months or more | 351,541 | 361,038
Total | 351,541 | 364,799
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | 0 | (5)
12 months or more | (17,297) | (26,567)
Total | (17,297) | (26,572)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 0 | 3,756
12 months or more | 334,244 | 334,471
Total | 334,244 | 338,227
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 635 | 16,154
12 months or more | 289,200 | 284,397
Total | 289,835 | 300,551
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (24) | (1,250)
12 months or more | (40,392) | (47,040)
Total | (40,416) | (48,290)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 611 | 14,904
12 months or more | 248,808 | 237,357
Total | 249,419 | 252,261
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 26,266 | 16,056
12 months or more | 435,447 | 500,763
Total | 461,713 | 516,819
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (188) | (289)
12 months or more | (49,728) | (61,847)
Total | (49,916) | (62,136)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 26,078 | 15,767
12 months or more | 385,719 | 438,916
Total | 411,797 | 454,683
Asset-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 24,547 | 0
12 months or more | 15,939 | 87,993
Total | 40,486 | 87,993
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (34) | 0
12 months or more | (74) | (767)
Total | (108) | (767)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 24,513 | 0
12 months or more | 15,865 | 87,226
Total | $ 40,378 | $ 87,226

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