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Investment Securities - Available-for-sale Securities with Unrealized Loss (Details) $ in Thousands | Sep. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
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Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | $ 169,408 | $ 299,453
Less than 12 months, unrealized loss | $ 9,454 | $ 12,051
Less than 12 months, Number of securities | security | 236 | 254
12 months or more, fair value | $ 837,356 | $ 803,481
12 months or more, unrealized loss | $ 184,491 | $ 158,373
12 months or more, Number of securities | security | 446 | 308
Total fair value | $ 1,006,764 | $ 1,102,934
Total unrealized loss | 193,945 | 170,424
U.S. Treasury and government agencies |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 15,992 | 112,730
Less than 12 months, unrealized loss | $ 374 | $ 2,772
Less than 12 months, Number of securities | security | 19 | 13
12 months or more, fair value | $ 26,476 | $ 39,692
12 months or more, unrealized loss | $ 2,367 | $ 3,279
12 months or more, Number of securities | security | 12 | 11
Total fair value | $ 42,468 | $ 152,422
Total unrealized loss | 2,741 | 6,051
U.S. government sponsored agencies |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 29,514 | 15,166
Less than 12 months, unrealized loss | $ 450 | $ 249
Less than 12 months, Number of securities | security | 17 | 17
12 months or more, fair value | $ 74,418 | $ 66,706
12 months or more, unrealized loss | $ 13,766 | $ 13,407
12 months or more, Number of securities | security | 17 | 18
Total fair value | $ 103,932 | $ 81,872
Total unrealized loss | 14,216 | 13,656
States and political subdivisions |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 47,093 | 60,324
Less than 12 months, unrealized loss | $ 3,358 | $ 714
Less than 12 months, Number of securities | security | 106 | 114
12 months or more, fair value | $ 170,282 | $ 156,900
12 months or more, unrealized loss | $ 39,189 | $ 35,028
12 months or more, Number of securities | security | 156 | 117
Total fair value | $ 217,375 | $ 217,224
Total unrealized loss | 42,547 | 35,742
Residential mortgage-backed securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 68,958 | 104,959
Less than 12 months, unrealized loss | $ 4,928 | $ 8,087
Less than 12 months, Number of securities | security | 85 | 105
12 months or more, fair value | $ 519,488 | $ 488,452
12 months or more, unrealized loss | $ 117,194 | $ 95,302
12 months or more, Number of securities | security | 238 | 139
Total fair value | $ 588,446 | $ 593,411
Total unrealized loss | 122,122 | 103,389
Commercial mortgage-backed securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 7,851 | 1,874
Less than 12 months, unrealized loss | $ 344 | $ 129
Less than 12 months, Number of securities | security | 9 | 2
12 months or more, fair value | $ 42,767 | $ 48,175
12 months or more, unrealized loss | $ 11,400 | $ 10,913
12 months or more, Number of securities | security | 21 | 21
Total fair value | $ 50,618 | $ 50,049
Total unrealized loss | 11,744 | 11,042
Bank-issued trust preferred securities |  |
Available-for-sale securities that had an unrealized loss: |  |
Less than 12 months, fair value | 0 | 4,400
Less than 12 months, unrealized loss | $ 0 | $ 100
Less than 12 months, Number of securities | security | 0 | 3
12 months or more, fair value | $ 3,925 | $ 3,556
12 months or more, unrealized loss | $ 575 | $ 444
12 months or more, Number of securities | security | 2 | 2
Total fair value | $ 3,925 | $ 7,956
Total unrealized loss | $ 575 | $ 544

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