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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Groupings (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Amount |  |
Financial Assets [Abstract] |  |
Cash and due from banks | $ 1,184,183 | $ 243,603
Loans, net | 9,453,871 | 5,580,583
Accrued interest receivable | 47,209 | 34,815
Financial Liabilities [Abstract] |  |
Savings, money market and checking accounts | 9,765,228 | 3,212,495
Certificates of Deposits ("CDs") | 1,300,965 | 1,322,638
FHLBNY Advances | 25,000 | 1,204,010
Subordinated debt, net | 197,188 | 114,052
Other borrowings | 1,841 | 120,000
Accrued interest payable | 1,068 | 1,734
Fair Value |  |
Financial Assets [Abstract] |  |
Cash and due from banks | 1,184,183 | 243,603
Loans, net | 9,523,466 | 5,598,787
Accrued interest receivable | 47,209 | 34,815
Financial Liabilities [Abstract] |  |
Savings, money market and checking accounts | 9,765,228 | 3,212,495
Certificates of Deposits ("CDs") | 1,307,876 | 1,328,554
FHLBNY Advances | 25,013 | 1,207,890
Subordinated debt, net | 203,201 | 114,340
Other borrowings | 1,841 | 120,000
Accrued interest payable | 1,068 | 1,734
Fair Value | Level 1 Inputs [Member] |  |
Financial Assets [Abstract] |  |
Cash and due from banks | 1,184,183 | 243,603
Accrued interest receivable |  | 2
Financial Liabilities [Abstract] |  |
Savings, money market and checking accounts | 9,765,228 | 3,212,495
Other borrowings | 1,841 | 120,000
Fair Value | Level 2 Inputs [Member] |  |
Financial Assets [Abstract] |  |
Accrued interest receivable | 3,415 | 1,584
Financial Liabilities [Abstract] |  |
Certificates of Deposits ("CDs") | 1,307,876 | 1,328,554
FHLBNY Advances | 25,013 | 1,207,890
Subordinated debt, net | 203,201 | 114,340
Accrued interest payable | 1,068 | 1,734
Fair Value | Level 3 Inputs [Member] |  |
Financial Assets [Abstract] |  |
Loans, net | 9,523,466 | 5,598,787
Accrued interest receivable | $ 43,794 | $ 33,229

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- Definition Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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