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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Securities [Abstract]    
Percentage of total investment with unrealized losses 61.00% 16.20%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 920,980 $ 87,261
12 months or more 21,402 75,247
Total 942,382 162,508
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (11,746) (375)
12 months or more (124) (411)
Total (11,870) (786)
Available-for-sale, fair value [Abstract]    
Less than 12 months 909,234 86,886
12 months or more 21,278 74,836
Total 930,512 161,722
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 206,535 5,604
12 months or more 15,963 46,163
Total 222,498 51,767
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (1,996) (7)
12 months or more (66) (190)
Total (2,062) (197)
Available-for-sale, fair value [Abstract]    
Less than 12 months 204,539 5,597
12 months or more 15,897 45,973
Total 220,436 51,570
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 194,869 534
12 months or more 532 0
Total 195,401 534
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (5,363) (3)
12 months or more (18) 0
Total (5,381) (3)
Available-for-sale, fair value [Abstract]    
Less than 12 months 189,506 531
12 months or more 514 0
Total 190,020 531
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 470,340 58,463
12 months or more 3,487 2,801
Total 473,827 61,264
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (4,257) (336)
12 months or more (39) (42)
Total (4,296) (378)
Available-for-sale, fair value [Abstract]    
Less than 12 months 466,083 58,127
12 months or more 3,448 2,759
Total 469,531 60,886
Asset-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 49,236 22,660
12 months or more 1,420 26,283
Total 50,656 48,943
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (130) (29)
12 months or more (1) (179)
Total (131) (208)
Available-for-sale, fair value [Abstract]    
Less than 12 months 49,106 22,631
12 months or more 1,419 26,104
Total $ 50,525 $ 48,735