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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Overnight borrowings with FHLB |  | $ 15,000
Unused commitments from FHLB | $ 1,700,000 |
Unused short-term or overnight borrowings from correspondent banks | 22,000 |
Unused short-term or overnight borrowings from FRB | 1,000,000 |
Borrowings from the federal reserve’s PPPLF | $ 83,586 | 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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