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Investment Securities - Summary of Available-for-sale Securities with Unrealized Loss (Details) $ in Thousands | Jun. 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 | $ 190,495 | $ 257,325
Less than 12 months, unrealized loss | $ 5,679 | $ 9,578
Less than 12 months, Number of securities | security | 111 | 168
12 months or more, fair value | $ 750,655 | $ 768,333
12 months or more, unrealized loss | $ 115,314 | $ 137,832
12 months or more, Number of securities | security | 448 | 444
Total fair value | $ 941,150 | $ 1,025,658
Total unrealized loss | 120,993 | 147,410
U.S. Treasury and government agencies |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 983 | 10,003
Less than 12 months, unrealized loss | $ 5 | $ 174
Less than 12 months, Number of securities | security | 4 | 11
12 months or more, fair value | $ 1,578 | $ 2,299
12 months or more, unrealized loss | $ 11 | $ 34
12 months or more, Number of securities | security | 7 | 10
Total fair value | $ 2,561 | $ 12,302
Total unrealized loss | 16 | 208
U.S. government sponsored agencies |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 106,894 | 130,518
Less than 12 months, unrealized loss | $ 3,443 | $ 5,816
Less than 12 months, Number of securities | security | 24 | 27
12 months or more, fair value | $ 72,437 | $ 70,982
12 months or more, unrealized loss | $ 6,920 | $ 9,321
12 months or more, Number of securities | security | 13 | 13
Total fair value | $ 179,331 | $ 201,500
Total unrealized loss | 10,363 | 15,137
States and political subdivisions |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 17,399 | 28,400
Less than 12 months, unrealized loss | $ 1,056 | $ 1,188
Less than 12 months, Number of securities | security | 34 | 55
12 months or more, fair value | $ 164,776 | $ 160,210
12 months or more, unrealized loss | $ 25,866 | $ 27,601
12 months or more, Number of securities | security | 151 | 138
Total fair value | $ 182,175 | $ 188,610
Total unrealized loss | 26,922 | 28,789
Residential mortgage-backed securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 57,009 | 85,043
Less than 12 months, unrealized loss | $ 1,117 | $ 2,300
Less than 12 months, Number of securities | security | 42 | 69
12 months or more, fair value | $ 463,844 | $ 482,609
12 months or more, unrealized loss | $ 75,030 | $ 91,175
12 months or more, Number of securities | security | 252 | 256
Total fair value | $ 520,853 | $ 567,652
Total unrealized loss | 76,147 | 93,475
Commercial mortgage-backed securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 8,210 | 2,868
Less than 12 months, unrealized loss | $ 58 | $ 93
Less than 12 months, Number of securities | security | 7 | 5
12 months or more, fair value | $ 44,367 | $ 46,619
12 months or more, unrealized loss | $ 7,141 | $ 9,316
12 months or more, Number of securities | security | 23 | 24
Total fair value | $ 52,577 | $ 49,487
Total unrealized loss | 7,199 | 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 | $ 3,653 | $ 5,614
12 months or more, unrealized loss | $ 346 | $ 385
12 months or more, Number of securities | security | 2 | 3
Total fair value | $ 3,653 | $ 6,107
Total unrealized loss | $ 346 | $ 392

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