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Investment Securities - Summary of Available-for-sale Securities with Unrealized Loss (Details) $ in Thousands | Mar. 31, 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 | $ 308,921 | $ 257,325
Less than 12 months, unrealized loss | $ 5,432 | $ 9,578
Less than 12 months, Number of securities | security | 126 | 168
12 months or more, fair value | $ 764,271 | $ 768,333
12 months or more, unrealized loss | $ 122,803 | $ 137,832
12 months or more, Number of securities | security | 456 | 444
Total fair value | $ 1,073,192 | $ 1,025,658
Total unrealized loss | 128,235 | 147,410
U.S. Treasury and government agencies |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 12,281 | 10,003
Less than 12 months, unrealized loss | $ 46 | $ 174
Less than 12 months, Number of securities | security | 8 | 11
12 months or more, fair value | $ 2,062 | $ 2,299
12 months or more, unrealized loss | $ 15 | $ 34
12 months or more, Number of securities | security | 9 | 10
Total fair value | $ 14,343 | $ 12,302
Total unrealized loss | 61 | 208
U.S. government sponsored agencies |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 141,400 | 130,518
Less than 12 months, unrealized loss | $ 3,090 | $ 5,816
Less than 12 months, Number of securities | security | 23 | 27
12 months or more, fair value | $ 71,663 | $ 70,982
12 months or more, unrealized loss | $ 7,671 | $ 9,321
12 months or more, Number of securities | security | 13 | 13
Total fair value | $ 213,063 | $ 201,500
Total unrealized loss | 10,761 | 15,137
States and political subdivisions |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 30,058 | 28,400
Less than 12 months, unrealized loss | $ 910 | $ 1,188
Less than 12 months, Number of securities | security | 35 | 55
12 months or more, fair value | $ 165,447 | $ 160,210
12 months or more, unrealized loss | $ 26,949 | $ 27,601
12 months or more, Number of securities | security | 154 | 138
Total fair value | $ 195,505 | $ 188,610
Total unrealized loss | 27,859 | 28,789
Residential mortgage-backed securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 116,813 | 85,043
Less than 12 months, unrealized loss | $ 1,313 | $ 2,300
Less than 12 months, Number of securities | security | 54 | 69
12 months or more, fair value | $ 477,184 | $ 482,609
12 months or more, unrealized loss | $ 80,237 | $ 91,175
12 months or more, Number of securities | security | 255 | 256
Total fair value | $ 593,997 | $ 567,652
Total unrealized loss | 81,550 | 93,475
Commercial mortgage-backed securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 8,369 | 2,868
Less than 12 months, unrealized loss | $ 73 | $ 93
Less than 12 months, Number of securities | security | 6 | 5
12 months or more, fair value | $ 44,267 | $ 46,619
12 months or more, unrealized loss | $ 7,579 | $ 9,316
12 months or more, Number of securities | security | 23 | 24
Total fair value | $ 52,636 | $ 49,487
Total unrealized loss | 7,652 | 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 | $ 3,648 | $ 5,614
12 months or more, unrealized loss | $ 352 | $ 385
12 months or more, Number of securities | security | 2 | 3
Total fair value | $ 3,648 | $ 6,107
Total unrealized loss | $ 352 | $ 392

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