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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Securities [Abstract]    
Percentage of total investment with unrealized losses 43.60% 16.20%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 570,341 $ 87,261
12 months or more 26,790 75,247
Total 597,131 162,508
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (5,073) (375)
12 months or more (134) (411)
Total (5,207) (786)
Available-for-sale, fair value [Abstract]    
Less than 12 months 565,268 86,886
12 months or more 26,656 74,836
Total 591,924 161,722
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 111,855 5,604
12 months or more 22,311 46,163
Total 134,166 51,767
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (837) (7)
12 months or more (94) (190)
Total (931) (197)
Available-for-sale, fair value [Abstract]    
Less than 12 months 111,018 5,597
12 months or more 22,217 45,973
Total 133,235 51,570
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 101,456 534
12 months or more 532 0
Total 101,988 534
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (2,151) (3)
12 months or more (16) 0
Total (2,167) (3)
Available-for-sale, fair value [Abstract]    
Less than 12 months 99,305 531
12 months or more 516 0
Total 99,821 531
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 330,841 58,463
12 months or more 2,468 2,801
Total 333,309 61,264
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (2,020) (336)
12 months or more (8) (42)
Total (2,028) (378)
Available-for-sale, fair value [Abstract]    
Less than 12 months 328,821 58,127
12 months or more 2,460 2,759
Total 331,281 60,886
Other Debt Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 26,189 22,660
12 months or more 1,479 26,283
Total 27,668 48,943
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (65) (29)
12 months or more (16) (179)
Total (81) (208)
Available-for-sale, fair value [Abstract]    
Less than 12 months 26,124 22,631
12 months or more 1,463 26,104
Total $ 27,587 $ 48,735