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SECURITIES - Unrealized Loss Analysis on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | $ 1,066,966 | $ 496,891
12 months or more, fair value | 146,940 | 51,468
Total fair value | 1,213,906 | 548,359
Less than 12 months, unrealized losses | 149,243 | 6,714
12 Months or more, unrealized losses | 27,245 | 1,941
Total unrealized losses | 176,488 | 8,655
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 2,234 |
12 months or more, fair value | 0 |
Total fair value | 2,234 |
Less than 12 months, unrealized losses | 15 |
12 Months or more, unrealized losses | 0 |
Total unrealized losses | 15 |
U.S. government sponsored agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 106,954 | 85,968
12 months or more, fair value | 35,307 | 28,676
Total fair value | 142,261 | 114,644
Less than 12 months, unrealized losses | 13,796 | 1,364
12 Months or more, unrealized losses | 5,530 | 1,081
Total unrealized losses | 19,326 | 2,445
Mortgage-backed securities: residential |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 447,418 | 272,264
12 months or more, fair value | 100,785 | 22,792
Total fair value | 548,203 | 295,056
Less than 12 months, unrealized losses | 43,772 | 4,076
12 Months or more, unrealized losses | 18,018 | 860
Total unrealized losses | 61,790 | 4,936
State and municipal securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 510,360 | 138,659
12 months or more, fair value | 10,848 | 0
Total fair value | 521,208 | 138,659
Less than 12 months, unrealized losses | 91,660 | 1,274
12 Months or more, unrealized losses | 3,697 | 0
Total unrealized losses | 95,357 | $ 1,274
Schedule of Held-to-Maturity Securities |  |
Less than 12 months, fair value | 113,350 |
12 months or more, fair value | 0 |
Total fair value | 113,350 |
Less than 12 months, unrealized losses | 14,061 |
12 Months or more, unrealized losses | 0 |
Total unrealized losses | $ 14,061 |

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