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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2021
Debt Instrument [Line Items] |  |  |
Overnight borrowings with FHLB |  | $ 15,000 |
Unused commitments from FHLB | $ 1,900,000 |  |
Unused short-term or overnight borrowings from correspondent banks | 22,000 |  |
Unused short-term or overnight borrowings from FRB | 1,100,000 |  |
Borrowings from the federal reserve’s PPPLF | $ 48,496 | 177,086 |
Paycheck protection program liquidity facility interest rate | 0.35% |  |
Paycheck protection program liquidity facility term | 2 years |  |
Prepaid FHLB advances |  | 105,000 |
FHLB prepayment penalty |  | 4,800 |
Interest Rate Swap [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notional amount |  |  | $ 15,000
FHLB advance |  |  | $ 15,000
Federal Reserve Bank of New York [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Overnight borrowings with FHLB | $ 0 | $ 0 |

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