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FAIR VALUE OF FINANCIAL INSTRUMENTS - Financial Instruments Not Measured at Fair Value (Details) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021 | Jan. 01, 2021
--- | --- | --- | ---
Financial Assets [Abstract] |  |  |
Securities held-to-maturity | $ 511,054,000 | $ 177,354,000 | $ 0
Carrying Amount |  |  |
Financial Assets [Abstract] |  |  |
Cash and due from banks | 312,996,000 | 393,722,000 |
Securities held-to-maturity | 591,403,000 | 179,309,000 |
Loans held for investment, net | 10,033,553,000 | 9,158,908,000 |
Accrued interest receivable | 41,567,000 | 40,149,000 |
Financial Liabilities [Abstract] |  |  |
Savings, money market and checking accounts | 9,557,896,000 | 9,605,731,000 |
Certificates of Deposits ("CDs") | 930,774,000 | 853,242,000 |
FHLBNY Advances | 620,000,000 | 25,000,000 |
Subordinated debt, net | 200,305,000 | 197,096,000 |
Other short-term borrowings | 2,124,000 | 1,862,000 |
Accrued interest payable | 4,548,000 | 870,000 |
Fair Value |  |  |
Financial Assets [Abstract] |  |  |
Cash and due from banks | 312,996,000 | 393,722,000 |
Securities held-to-maturity | 511,054,000 | 177,354,000 |
Loans held for investment, net | 9,594,094,000 | 9,169,872,000 |
Accrued interest receivable | 41,567,000 | 40,149,000 |
Financial Liabilities [Abstract] |  |  |
Savings, money market and checking accounts | 9,557,896,000 | 9,605,731,000 |
Certificates of Deposits ("CDs") | 922,132,000 | 857,342,000 |
FHLBNY Advances | 619,993,000 | 25,014,000 |
Subordinated debt, net | 184,305,000 | 202,334,000 |
Other short-term borrowings | 2,124,000 | 1,862,000 |
Accrued interest payable | 4,548,000 | 870,000 |
Level 1 Inputs | Fair Value |  |  |
Financial Assets [Abstract] |  |  |
Cash and due from banks | 312,996,000 | 393,722,000 |
Financial Liabilities [Abstract] |  |  |
Savings, money market and checking accounts | 9,557,896,000 | 9,605,731,000 |
Other short-term borrowings | 2,124,000 | 1,862,000 |
Level 2 Inputs | Fair Value |  |  |
Financial Assets [Abstract] |  |  |
Securities held-to-maturity | 511,054,000 | 177,354,000 |
Accrued interest receivable | 4,971,000 | 4,481,000 |
Financial Liabilities [Abstract] |  |  |
Certificates of Deposits ("CDs") | 922,132,000 | 857,342,000 |
FHLBNY Advances | 619,993,000 | 25,014,000 |
Subordinated debt, net | 184,305,000 | 202,334,000 |
Accrued interest payable | 4,548,000 | 870,000 |
Level 3 Inputs | Fair Value |  |  |
Financial Assets [Abstract] |  |  |
Loans held for investment, net | 9,594,094,000 | 9,169,872,000 |
Accrued interest receivable | $ 36,596,000 | $ 35,668,000 |

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