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SECURITIES - Unrealized Loss Analysis on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | $ 888,199 | $ 496,891
12 months or more, fair value | 292,062 | 51,468
Total fair value | 1,180,261 | 548,359
Less than 12 months, unrealized losses | 179,054 | 6,714
12 Months or more, unrealized losses | 77,173 | 1,941
Total unrealized losses | 256,227 | 8,655
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 1,968 |
12 months or more, fair value | 0 |
Total fair value | 1,968 |
Less than 12 months, unrealized losses | 26 |
12 Months or more, unrealized losses | 0 |
Total unrealized losses | 26 |
U.S. government sponsored agencies |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 47,754 | 85,968
12 months or more, fair value | 83,501 | 28,676
Total fair value | 131,255 | 114,644
Less than 12 months, unrealized losses | 9,295 | 1,364
12 Months or more, unrealized losses | 18,619 | 1,081
Total unrealized losses | 27,914 | 2,445
Mortgage-backed securities: residential |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 336,939 | 272,264
12 months or more, fair value | 164,085 | 22,792
Total fair value | 501,024 | 295,056
Less than 12 months, unrealized losses | 52,248 | 4,076
12 Months or more, unrealized losses | 40,334 | 860
Total unrealized losses | 92,582 | 4,936
State and municipal securities |  |
Schedule of Available-for-sale Securities |  |
Less than 12 months, fair value | 501,538 | 138,659
12 months or more, fair value | 44,476 | 0
Total fair value | 546,014 | 138,659
Less than 12 months, unrealized losses | 117,485 | 1,274
12 Months or more, unrealized losses | 18,220 | 0
Total unrealized losses | 135,705 | $ 1,274
Schedule of Held-to-Maturity Securities |  |
Less than 12 months, fair value | 103,326 |
12 months or more, fair value | 0 |
Total fair value | 103,326 |
Less than 12 months, unrealized losses | (24,494) |
12 Months or more, unrealized losses | 0 |
Total unrealized losses | $ (24,494) |

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