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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Advances from Federal Home Loan Banks | $ 0 | $ 105,000,000.0
FHLB interest rate |  | 3.20%
Prepaid FHLB advances | 105,000,000.0 |
FHLB prepayment penalty | 4,784,000 |
Short-term or overnight borrowings with FHLB | 15,000,000 | $ 128,100,000
Rate of overnight borrowings with FHLB |  | 1.81%
FHLB advance | $ 15,000,000.0 | $ 15,000,000.0
FHLB advance rate | 0.34% | 1.79%
Cash flow hedge, term | 3 years |
Unused commitments from FHLB | $ 1,800,000,000 |
Unused short-term or overnight borrowings from correspondent banks | 22,000,000.0 |
Unused short-term or overnight borrowings from FRB | 987,700,000,000 |
Borrowings from the federal reserve’s PPPLF | $ 177,086,000 |
Paycheck protection program liquidity facility interest rate | 0.35% |
Paycheck protection program liquidity facility term | 2 years |
Federal Reserve Bank of New York [Member] |  |
Debt Instrument [Line Items] |  |
Short-term or overnight borrowings with FHLB |  | $ 113,100,000
Residential Mortgage [Member] | Fixed Rate Advances [Member] |  |
Debt Instrument [Line Items] |  |
Mortgages pledged as collateral for advances |  | 347,500,000
Multifamily Mortgage [Member] | Fixed Rate Advances [Member] |  |
Debt Instrument [Line Items] |  |
Mortgages pledged as collateral for advances |  | 773,100,000
Securities [Member] | Fixed Rate Advances [Member] |  |
Debt Instrument [Line Items] |  |
Mortgages pledged as collateral for advances |  | $ 154,300,000

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition The calculated weighted average interest rate for Federal Home Loan Bank advances outstanding as of the Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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