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SECURITIES - Summary of Available For Sale and Held to Maturity Securities (Details) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | $ 1,448,323,000 | $ 1,376,969,000
Gross Unrealized Gain | 90,000 | 30,244,000
Gross Unrealized Losses | (256,227,000) | (8,655,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 1,192,186,000 | 1,398,558,000
Information related to held-to-maturity securities |  |
Amortized Cost | 127,820,000 | 0
Fair Value | 103,326,000 | 0
Allowance for credit losses for held-to-maturity | 0 |
U.S. Treasury securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 1,994,000 | 900,000
Gross Unrealized Gain | 0 | 0
Gross Unrealized Losses | (26,000) | 0
Allowance for Credit Losses | 0 | 0
Fair Value | 1,968,000 | 900,000
U.S. government sponsored agencies |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 159,169,000 | 145,858,000
Gross Unrealized Gain | 0 | 39,000
Gross Unrealized Losses | (27,914,000) | (2,445,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 131,255,000 | 143,452,000
Mortgage-backed securities: residential |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 597,258,000 | 487,157,000
Gross Unrealized Gain | 80,000 | 4,455,000
Gross Unrealized Losses | (92,582,000) | (4,936,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 504,756,000 | 486,676,000
Mortgage-backed securities: commercial |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost |  | 522,000
Gross Unrealized Gain |  | 1,000
Gross Unrealized Losses |  | 0
Allowance for Credit Losses |  | 0
Fair Value |  | 523,000
State and municipal securities |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Amortized Cost | 689,902,000 | 742,532,000
Gross Unrealized Gain | 10,000 | 25,749,000
Gross Unrealized Losses | (135,705,000) | (1,274,000)
Allowance for Credit Losses | 0 | 0
Fair Value | 554,207,000 | $ 767,007,000
Information related to held-to-maturity securities |  |
Amortized Cost | 127,820,000 |
Gross Unrealized Gain | 0 |
Gross Unrealized Losses | (24,494,000) |
Allowance for Credit Losses | 0 |
Fair Value | $ 103,326,000 |

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