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FEDERAL HOME LOAN BANK ADVANCES AND SHORT-TERM BORROWINGS - Summary of Advances (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Federal Home Loan Bank, Advances [Line Items]
Debt issuance costs	$ 6,200
Outstanding balance	461,000	$ 730,000
Variable bank advances	$ 85,000	$ 465,000
FHLB variable-rate, weighted average interest rate (percent)	0.17%	1.66%
Federal Home Loan Bank Advances Maturing May 27, 2021
Federal Home Loan Bank, Advances [Line Items]
Outstanding balance	$ 5,000
Company advances weighted average interest rate (percent)	0.00%
Minimum
Federal Home Loan Bank, Advances [Line Items]
Company advances weighted average interest rate (percent)	0.00%	1.82%
Maximum
Federal Home Loan Bank, Advances [Line Items]
Company advances weighted average interest rate (percent)	3.32%	3.32%
Weighted Average
Federal Home Loan Bank, Advances [Line Items]
Company advances weighted average interest rate (percent)	2.51%	2.66%

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Federal Home Loan Bank, Advances, General Debt Obligations, Disclosure, Weighted Average Interest Rate, Variable

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Amount of unearned commitment fees on advances made and reported by Federal Home Loan Bank (FHLBank).

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States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

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Amount of Federal Home Loan Bank (FHLB) advances which have fixed interest.

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Amount of Federal Home Loan Bank (FHLB) advances which have floating interest rates.

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