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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Securities [Abstract]    
Percentage of total investment with unrealized losses 97.20% 72.40%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 552,317 $ 973,642
12 months or more 898,838 97,329
Total 1,451,155 1,070,971
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (42,877) (15,851)
12 months or more (145,686) (1,832)
Total (188,563) (17,683)
Available-for-sale, fair value [Abstract]    
Less than 12 months 509,440 957,791
12 months or more 753,152 95,497
Total 1,262,592 1,053,288
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 174,884 249,990
12 months or more 234,630 14,505
Total 409,514 264,495
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (9,685) (4,123)
12 months or more (30,031) (64)
Total (39,716) (4,187)
Available-for-sale, fair value [Abstract]    
Less than 12 months 165,199 245,867
12 months or more 204,599 14,441
Total 369,798 260,308
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 138,322 197,592
12 months or more 184,173 19,126
Total 322,495 216,718
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (19,957) (4,779)
12 months or more (48,227) (760)
Total (68,184) (5,539)
Available-for-sale, fair value [Abstract]    
Less than 12 months 118,365 192,813
12 months or more 135,946 18,366
Total 254,311 211,179
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 191,768 473,831
12 months or more 434,704 62,330
Total 626,472 536,161
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (11,796) (6,759)
12 months or more (65,898) (1,006)
Total (77,694) (7,765)
Available-for-sale, fair value [Abstract]    
Less than 12 months 179,972 467,072
12 months or more 368,806 61,324
Total 548,778 528,396
Asset-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 47,343 52,229
12 months or more 45,331 1,368
Total 92,674 53,597
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (1,439) (190)
12 months or more (1,530) (2)
Total (2,969) (192)
Available-for-sale, fair value [Abstract]    
Less than 12 months 45,904 52,039
12 months or more 43,801 1,366
Total $ 89,705 $ 53,405