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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
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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

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