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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Securities [Abstract]    
Percentage of total investment with unrealized losses 97.30% 97.40%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 35,971 $ 416,778
12 months or more 1,234,191 981,280
Total 1,270,162 1,398,058
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (1,544) (21,324)
12 months or more (136,221) (153,300)
Total (137,765) (174,624)
Available-for-sale, fair value [Abstract]    
Less than 12 months 34,427 395,454
12 months or more 1,097,970 827,980
Total 1,132,397 1,223,434
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 3,761 144,305
12 months or more 361,038 249,424
Total 364,799 393,729
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (5) (6,953)
12 months or more (26,567) (29,906)
Total (26,572) (36,859)
Available-for-sale, fair value [Abstract]    
Less than 12 months 3,756 137,352
12 months or more 334,471 219,518
Total 338,227 356,870
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 16,154 94,277
12 months or more 284,397 225,019
Total 300,551 319,296
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (1,250) (6,257)
12 months or more (47,040) (55,419)
Total (48,290) (61,676)
Available-for-sale, fair value [Abstract]    
Less than 12 months 14,904 88,020
12 months or more 237,357 169,600
Total 252,261 257,620
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 16,056 139,314
12 months or more 500,763 454,357
Total 516,819 593,671
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (289) (6,883)
12 months or more (61,847) (66,950)
Total (62,136) (73,833)
Available-for-sale, fair value [Abstract]    
Less than 12 months 15,767 132,431
12 months or more 438,916 387,407
Total 454,683 519,838
Asset-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 0 38,882
12 months or more 87,993 52,480
Total 87,993 91,362
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months 0 (1,231)
12 months or more (767) (1,025)
Total (767) (2,256)
Available-for-sale, fair value [Abstract]    
Less than 12 months 0 37,651
12 months or more 87,226 51,455
Total $ 87,226 $ 89,106