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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Securities [Abstract]    
Percentage of total investment with unrealized losses 87.70% 72.40%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 1,201,284 $ 973,642
12 months or more 204,363 97,329
Total 1,405,647 1,070,971
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (66,809) (15,851)
12 months or more (20,023) (1,832)
Total (86,832) (17,683)
Available-for-sale, fair value [Abstract]    
Less than 12 months 1,134,475 957,791
12 months or more 184,340 95,497
Total 1,318,815 1,053,288
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 395,941 249,990
12 months or more 50,328 14,505
Total 446,269 264,495
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (17,249) (4,123)
12 months or more (3,325) (64)
Total (20,574) (4,187)
Available-for-sale, fair value [Abstract]    
Less than 12 months 378,692 245,867
12 months or more 47,003 14,441
Total 425,695 260,308
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 204,547 197,592
12 months or more 67,941 19,126
Total 272,488 216,718
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (19,287) (4,779)
12 months or more (10,630) (760)
Total (29,917) (5,539)
Available-for-sale, fair value [Abstract]    
Less than 12 months 185,260 192,813
12 months or more 57,311 18,366
Total 242,571 211,179
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 524,844 473,831
12 months or more 84,800 62,330
Total 609,644 536,161
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (29,719) (6,759)
12 months or more (6,061) (1,006)
Total (35,780) (7,765)
Available-for-sale, fair value [Abstract]    
Less than 12 months 495,125 467,072
12 months or more 78,739 61,324
Total 573,864 528,396
Asset-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 75,952 52,229
12 months or more 1,294 1,368
Total 77,246 53,597
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (554) (190)
12 months or more (7) (2)
Total (561) (192)
Available-for-sale, fair value [Abstract]    
Less than 12 months 75,398 52,039
12 months or more 1,287 1,366
Total $ 76,685 $ 53,405