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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
FHLB advance | $ 15,000 |
FHLB advance rate | 0.36% |
Cash flow hedge, term | 3 years |
Overnight borrowings with FHLB | $ 15,000 | $ 15,000
Unused commitments from FHLB | 1,800,000 |
Unused short-term or overnight borrowings from correspondent banks | 22,000 |
Unused short-term or overnight borrowings from FRB | 990,000 |
Borrowings from the federal reserve’s PPPLF | $ 168,180 | 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] |  |
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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