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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Securities [Abstract]    
Percentage of total investment with unrealized losses 72.40% 16.20%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 973,642 $ 87,261
12 months or more 97,329 75,247
Total 1,070,971 162,508
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (15,851) (375)
12 months or more (1,832) (411)
Total (17,683) (786)
Available-for-sale, fair value [Abstract]    
Less than 12 months 957,791 86,886
12 months or more 95,497 74,836
Total 1,053,288 161,722
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 249,990 5,604
12 months or more 14,505 46,163
Total 264,495 51,767
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (4,123) (7)
12 months or more (64) (190)
Total (4,187) (197)
Available-for-sale, fair value [Abstract]    
Less than 12 months 245,867 5,597
12 months or more 14,441 45,973
Total 260,308 51,570
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 197,592 534
12 months or more 19,126 0
Total 216,718 534
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (4,779) (3)
12 months or more (760) 0
Total (5,539) (3)
Available-for-sale, fair value [Abstract]    
Less than 12 months 192,813 531
12 months or more 18,366 0
Total 211,179 531
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 473,831 58,463
12 months or more 62,330 2,801
Total 536,161 61,264
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (6,759) (336)
12 months or more (1,006) (42)
Total (7,765) (378)
Available-for-sale, fair value [Abstract]    
Less than 12 months 467,072 58,127
12 months or more 61,324 2,759
Total 528,396 60,886
Asset-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 52,229 22,660
12 months or more 1,368 26,283
Total 53,597 48,943
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (190) (29)
12 months or more (2) (179)
Total (192) (208)
Available-for-sale, fair value [Abstract]    
Less than 12 months 52,039 22,631
12 months or more 1,366 26,104
Total $ 53,405 $ 48,735