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Investment Securities - Summary of Available-for-sale Securities with Unrealized Loss (Details) $ in Thousands | Jun. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | $ 144,217 | $ 107,930
Less than 12 months, unrealized loss | $ 1,147 | $ 1,532
Less than 12 months, Number of securities | security | 95 | 132
12 months or more, fair value | $ 864,017 | $ 831,720
12 months or more, unrealized loss | $ 147,657 | $ 137,674
12 months or more, Number of securities | security | 509 | 420
Total fair value | $ 1,008,234 | $ 939,650
Total unrealized loss | 148,804 | 139,206
U.S. Treasury and government agencies |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 6,912 | 8,568
Less than 12 months, unrealized loss | $ 71 | $ 83
Less than 12 months, Number of securities | security | 9 | 22
12 months or more, fair value | $ 17,240 | $ 11,631
12 months or more, unrealized loss | $ 1,068 | $ 912
12 months or more, Number of securities | security | 19 | 5
Total fair value | $ 24,152 | $ 20,199
Total unrealized loss | 1,139 | 995
U.S. government sponsored agencies |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 86,183 | 14,439
Less than 12 months, unrealized loss | $ 117 | $ 35
Less than 12 months, Number of securities | security | 10 | 4
12 months or more, fair value | $ 80,062 | $ 74,211
12 months or more, unrealized loss | $ 10,575 | $ 10,497
12 months or more, Number of securities | security | 16 | 15
Total fair value | $ 166,245 | $ 88,650
Total unrealized loss | 10,692 | 10,532
States and political subdivisions |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 20,633 | 18,268
Less than 12 months, unrealized loss | $ 675 | $ 136
Less than 12 months, Number of securities | security | 54 | 32
12 months or more, fair value | $ 171,173 | $ 167,346
12 months or more, unrealized loss | $ 29,044 | $ 26,959
12 months or more, Number of securities | security | 149 | 138
Total fair value | $ 191,806 | $ 185,614
Total unrealized loss | 29,719 | 27,095
Residential mortgage-backed securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 28,049 | 58,671
Less than 12 months, unrealized loss | $ 271 | $ 1,150
Less than 12 months, Number of securities | security | 20 | 66
12 months or more, fair value | $ 542,532 | $ 529,895
12 months or more, unrealized loss | $ 96,913 | $ 89,517
12 months or more, Number of securities | security | 295 | 238
Total fair value | $ 570,581 | $ 588,566
Total unrealized loss | 97,184 | 90,667
Commercial mortgage-backed securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 451 | 6,000
Less than 12 months, unrealized loss | $ 2 | $ 112
Less than 12 months, Number of securities | security | 1 | 7
12 months or more, fair value | $ 49,464 | $ 44,656
12 months or more, unrealized loss | $ 9,604 | $ 9,270
12 months or more, Number of securities | security | 28 | 21
Total fair value | $ 49,915 | $ 50,656
Total unrealized loss | 9,606 | 9,382
Bank-issued trust preferred securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 1,989 | 1,984
Less than 12 months, unrealized loss | $ 11 | $ 16
Less than 12 months, Number of securities | security | 1 | 1
12 months or more, fair value | $ 3,546 | $ 3,981
12 months or more, unrealized loss | $ 453 | $ 519
12 months or more, Number of securities | security | 2 | 3
Total fair value | $ 5,535 | $ 5,965
Total unrealized loss | $ 464 | $ 535

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