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Investment Securities - Summary of Available-for-sale Securities with Unrealized Loss (Details) $ in Thousands | Sep. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | $ 50,769 | $ 107,930
Less than 12 months, unrealized loss | $ 625 | $ 1,532
Less than 12 months, Number of securities | security | 52 | 132
12 months or more, fair value | $ 823,889 | $ 831,720
12 months or more, unrealized loss | $ 113,184 | $ 137,674
12 months or more, Number of securities | security | 441 | 420
Total fair value | $ 874,658 | $ 939,650
Total unrealized loss | 113,809 | 139,206
U.S. Treasury and government agencies |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 1,456 | 8,568
Less than 12 months, unrealized loss | $ 7 | $ 83
Less than 12 months, Number of securities | security | 6 | 22
12 months or more, fair value | $ 13,408 | $ 11,631
12 months or more, unrealized loss | $ 595 | $ 912
12 months or more, Number of securities | security | 11 | 5
Total fair value | $ 14,864 | $ 20,199
Total unrealized loss | 602 | 995
U.S. government sponsored agencies |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 32,550 | 14,439
Less than 12 months, unrealized loss | $ 376 | $ 35
Less than 12 months, Number of securities | security | 12 | 4
12 months or more, fair value | $ 72,534 | $ 74,211
12 months or more, unrealized loss | $ 7,746 | $ 10,497
12 months or more, Number of securities | security | 13 | 15
Total fair value | $ 105,084 | $ 88,650
Total unrealized loss | 8,122 | 10,532
States and political subdivisions |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 9,831 | 18,268
Less than 12 months, unrealized loss | $ 125 | $ 136
Less than 12 months, Number of securities | security | 30 | 32
12 months or more, fair value | $ 167,599 | $ 167,346
12 months or more, unrealized loss | $ 22,568 | $ 26,959
12 months or more, Number of securities | security | 134 | 138
Total fair value | $ 177,430 | $ 185,614
Total unrealized loss | 22,693 | 27,095
Residential mortgage-backed securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 4,941 | 58,671
Less than 12 months, unrealized loss | $ 108 | $ 1,150
Less than 12 months, Number of securities | security | 3 | 66
12 months or more, fair value | $ 517,339 | $ 529,895
12 months or more, unrealized loss | $ 74,060 | $ 89,517
12 months or more, Number of securities | security | 256 | 238
Total fair value | $ 522,280 | $ 588,566
Total unrealized loss | 74,168 | 90,667
Commercial mortgage-backed securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 0 | 6,000
Less than 12 months, unrealized loss | $ 0 | $ 112
Less than 12 months, Number of securities | security | 0 | 7
12 months or more, fair value | $ 49,447 | $ 44,656
12 months or more, unrealized loss | $ 7,777 | $ 9,270
12 months or more, Number of securities | security | 25 | 21
Total fair value | $ 49,447 | $ 50,656
Total unrealized loss | 7,777 | 9,382
Bank-issued trust preferred securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 1,991 | 1,984
Less than 12 months, unrealized loss | $ 9 | $ 16
Less than 12 months, Number of securities | security | 1 | 1
12 months or more, fair value | $ 3,562 | $ 3,981
12 months or more, unrealized loss | $ 438 | $ 519
12 months or more, Number of securities | security | 2 | 3
Total fair value | $ 5,553 | $ 5,965
Total unrealized loss | $ 447 | $ 535

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