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INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 558,057 | $ 466,806 |
Gross Unrealized Gains | 125 | 9,487 |
Gross Unrealized Losses | 54,586 | 3,855 |
Fair Value | 503,596 | 472,438 |
U.S. Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 20,074 | 20,084 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 2,959 | 382 |
Fair Value | 17,115 | 19,702 |
States and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 254,603 | 185,437 |
Gross Unrealized Gains | 125 | 8,606 |
Gross Unrealized Losses | 34,692 | 673 |
Fair Value | 220,036 | 193,370 |
GSE residential MBSs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 64,258 | 41,260 |
Gross Unrealized Gains | 0 | 44 |
Gross Unrealized Losses | 5,055 | 578 |
Fair Value | 59,203 | 40,726 |
GSE residential CMOs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 70,964 | 66,430 |
Gross Unrealized Gains | 0 | 436 |
Gross Unrealized Losses | 6,814 | 944 |
Fair Value | 64,150 | 65,922 |
Non-agency CMOs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 31,346 | 30,676 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 2,374 | 978 |
Fair Value | 28,972 | 29,698 |
Asset-backed |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 116,427 | 122,520 |
Gross Unrealized Gains | 0 | 401 |
Gross Unrealized Losses | 2,692 | 300 |
Fair Value | 113,735 | 122,621 | $ 72,800
Other |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 385 | 399 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | $ 385 | $ 399 |

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