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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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Federal Home Loan Bank Advances Activity cash flow hedge, term.

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Federal home loan bank prepayment penalty.

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Amount of unused borrowing capacity under the short-term or overnight borrowings financing arrangement with Federal Reserve Bank.

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Prepaid federal home loan bank advances.

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The calculated weighted average interest rate for Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

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The maximum balance outstanding at any month end during the period as of the Balance Sheet date.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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