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FAIR VALUE OF FINANCIAL INSTRUMENTS - Balance Sheet Groupings (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets [Abstract] |  |
Securities held-to-maturity | $ 177,354 | $ 0
Carrying Amount |  |
Financial Assets [Abstract] |  |
Cash and due from banks | 393,722 | 243,603
Securities held-to-maturity | 179,309 |
Loans held for investment, net | 9,158,908 | 5,580,583
Accrued interest receivable | 40,149 | 34,815
Financial Liabilities [Abstract] |  |
Savings, money market and checking accounts | 9,605,731 | 3,202,484
Certificates of Deposits ("CDs") | 853,242 | 1,322,638
FHLBNY Advances | 25,000 | 1,204,010
Subordinated debt, net | 197,096 | 114,052
Other short-term borrowings | 1,862 | 120,000
Accrued interest payable | 870 | 1,734
Fair Value |  |
Financial Assets [Abstract] |  |
Cash and due from banks | 393,722 | 243,603
Securities held-to-maturity | 179,309 |
Loans held for investment, net | 9,169,872 | 5,598,787
Accrued interest receivable | 40,149 | 34,815
Financial Liabilities [Abstract] |  |
Savings, money market and checking accounts | 9,605,731 | 3,202,484
Certificates of Deposits ("CDs") | 857,342 | 1,328,554
FHLBNY Advances | 25,014 | 1,207,890
Subordinated debt, net | 202,334 | 114,340
Other short-term borrowings | 1,862 | 120,000
Accrued interest payable | 870 | 1,734
Level 1 Inputs [Member] | Fair Value |  |
Financial Assets [Abstract] |  |
Cash and due from banks | 393,722 | 243,603
Accrued interest receivable |  | 2
Financial Liabilities [Abstract] |  |
Savings, money market and checking accounts | 9,605,731 | 3,202,484
Other short-term borrowings | 1,862 | 120,000
Level 2 Inputs [Member] | Fair Value |  |
Financial Assets [Abstract] |  |
Securities held-to-maturity | 179,309 |
Accrued interest receivable | 4,481 | 1,584
Financial Liabilities [Abstract] |  |
Certificates of Deposits ("CDs") | 857,342 | 1,328,554
FHLBNY Advances | 25,014 | 1,207,890
Subordinated debt, net | 202,334 | 114,340
Accrued interest payable | 870 | 1,734
Level 3 Inputs [Member] | Fair Value |  |
Financial Assets [Abstract] |  |
Loans held for investment, net | 9,169,872 | 5,598,787
Accrued interest receivable | $ 35,668 | $ 33,229

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