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Investment Securities - Summary of Available-for-sale Securities with Unrealized Loss (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value $ 72,891 $ 257,325
Less than 12 months, unrealized loss $ 582 $ 9,578
Less than 12 months, Number of securities | security 26 168
12 months or more, fair value $ 816,338 $ 768,333
12 months or more, unrealized loss $ 103,522 $ 137,832
12 months or more, Number of securities | security 462 444
Total fair value $ 889,229 $ 1,025,658
Total unrealized loss 104,104 147,410
U.S. Treasury and government agencies    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 10,694 10,003
Less than 12 months, unrealized loss $ 37 $ 174
Less than 12 months, Number of securities | security 6 11
12 months or more, fair value $ 1,349 $ 2,299
12 months or more, unrealized loss $ 7 $ 34
12 months or more, Number of securities | security 6 10
Total fair value $ 12,043 $ 12,302
Total unrealized loss 44 208
U.S. government sponsored agencies    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 30,639 130,518
Less than 12 months, unrealized loss $ 371 $ 5,816
Less than 12 months, Number of securities | security 4 27
12 months or more, fair value $ 115,692 $ 70,982
12 months or more, unrealized loss $ 6,996 $ 9,321
12 months or more, Number of securities | security 27 13
Total fair value $ 146,331 $ 201,500
Total unrealized loss 7,367 15,137
States and political subdivisions    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 6,993 28,400
Less than 12 months, unrealized loss $ 159 $ 1,188
Less than 12 months, Number of securities | security 10 55
12 months or more, fair value $ 165,192 $ 160,210
12 months or more, unrealized loss $ 21,663 $ 27,601
12 months or more, Number of securities | security 148 138
Total fair value $ 172,185 $ 188,610
Total unrealized loss 21,822 28,789
Residential mortgage-backed securities    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 23,837 85,043
Less than 12 months, unrealized loss $ 10 $ 2,300
Less than 12 months, Number of securities | security 4 69
12 months or more, fair value $ 489,167 $ 482,609
12 months or more, unrealized loss $ 68,126 $ 91,175
12 months or more, Number of securities | security 256 256
Total fair value $ 513,004 $ 567,652
Total unrealized loss 68,136 93,475
Commercial mortgage-backed securities    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 728 2,868
Less than 12 months, unrealized loss $ 5 $ 93
Less than 12 months, Number of securities | security 2 5
12 months or more, fair value $ 41,210 $ 46,619
12 months or more, unrealized loss $ 6,458 $ 9,316
12 months or more, Number of securities | security 23 24
Total fair value $ 41,938 $ 49,487
Total unrealized loss 6,463 9,409
Bank-issued trust preferred securities    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 0 493
Less than 12 months, unrealized loss $ 0 $ 7
Less than 12 months, Number of securities | security 0 1
12 months or more, fair value $ 3,728 $ 5,614
12 months or more, unrealized loss $ 272 $ 385
12 months or more, Number of securities | security 2 3
Total fair value $ 3,728 $ 6,107
Total unrealized loss $ 272 $ 392