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Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Securities [Abstract]    
Percentage of total investment with unrealized losses 88.80% 95.50%
Available-for-sale, amortized cost [Abstract]    
Less than 12 months $ 71,568 $ 68,231
12 months or more 946,081 1,071,609
Total 1,017,649 1,139,840
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (654) (1,202)
12 months or more (95,071) (129,956)
Total (95,725) (131,158)
Available-for-sale, fair value [Abstract]    
Less than 12 months 70,914 67,029
12 months or more 851,010 941,653
Total 921,924 1,008,682
U.S. Treasury and Government Agencies [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 1,951 1,396
12 months or more 238,299 351,315
Total 240,250 352,711
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (6) (2)
12 months or more (10,128) (18,614)
Total (10,134) (18,616)
Available-for-sale, fair value [Abstract]    
Less than 12 months 1,945 1,394
12 months or more 228,171 332,701
Total 230,116 334,095
State and Political Subdivisions [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 4,527 14,262
12 months or more 285,485 288,445
Total 290,012 302,707
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (223) (192)
12 months or more (39,139) (50,851)
Total (39,362) (51,043)
Available-for-sale, fair value [Abstract]    
Less than 12 months 4,304 14,070
12 months or more 246,346 237,594
Total 250,650 251,664
Agency Mortgage-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 65,090 28,028
12 months or more 401,088 416,270
Total 466,178 444,298
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months (425) (994)
12 months or more (45,706) (60,428)
Total (46,131) (61,422)
Available-for-sale, fair value [Abstract]    
Less than 12 months 64,665 27,034
12 months or more 355,382 355,842
Total 420,047 382,876
Asset-backed Securities [Member]    
Available-for-sale, amortized cost [Abstract]    
Less than 12 months 0 24,545
12 months or more 21,209 15,579
Total 21,209 40,124
Available-for-sale, gross unrealized losses [Abstract]    
Less than 12 months 0 (14)
12 months or more (98) (63)
Total (98) (77)
Available-for-sale, fair value [Abstract]    
Less than 12 months 0 24,531
12 months or more 21,111 15,516
Total $ 21,111 $ 40,047