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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Securities [Abstract]    
Percentage of total investment with unrealized losses 90.20% 95.50%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 60,437 $ 68,231
12 months or more 945,191 1,071,609
Total 1,005,628 1,139,840
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (810) (1,202)
12 months or more (107,489) (129,956)
Total (108,299) (131,158)
Available-for-sale, fair value [Abstract]    
Less than 12 months 59,627 67,029
12 months or more 837,702 941,653
Total 897,329 1,008,682
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 3,260 1,396
12 months or more 250,876 351,315
Total 254,136 352,711
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (3) (2)
12 months or more (12,180) (18,614)
Total (12,183) (18,616)
Available-for-sale, fair value [Abstract]    
Less than 12 months 3,257 1,394
12 months or more 238,696 332,701
Total 241,953 334,095
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 10,030 14,262
12 months or more 283,887 288,445
Total 293,917 302,707
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (374) (192)
12 months or more (45,143) (50,851)
Total (45,517) (51,043)
Available-for-sale, fair value [Abstract]    
Less than 12 months 9,656 14,070
12 months or more 238,744 237,594
Total 248,400 251,664
Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 22,604 28,028
12 months or more 395,468 416,270
Total 418,072 444,298
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (418) (994)
12 months or more (50,022) (60,428)
Total (50,440) (61,422)
Available-for-sale, fair value [Abstract]    
Less than 12 months 22,186 27,034
12 months or more 345,446 355,842
Total 367,632 382,876
Asset-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 24,543 24,545
12 months or more 14,960 15,579
Total 39,503 40,124
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (15) (14)
12 months or more (144) (63)
Total (159) (77)
Available-for-sale, fair value [Abstract]    
Less than 12 months 24,528 24,531
12 months or more 14,816 15,516
Total $ 39,344 $ 40,047