FAIR VALUE - Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial assets:
Cash and due from financial institutions	$ 52,563	$ 29,309
Interest-earning deposits in other financial institutions	23,017	26,560
Securities available for sale	569,004	632,589
Securities held to maturity	1,804	2,424
Loans, net and loans held for sale	1,910,436	1,809,789
Derivative assets	32,923	27,141
Deposits [Abstract]
FHLBNY overnight advances	0	95,810
Derivative Liabilities	32,923	27,196
Recurring
Financial assets:
Securities available for sale	569,004	632,589
Derivative assets	32,923	27,141
Deposits [Abstract]
Derivative Liabilities	32,923	27,196
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Securities available for sale	55,000	55,574
Derivative assets	0	0
Deposits [Abstract]
Derivative Liabilities	0	0
Recurring | Significant Other Observable Inputs (Level 2)
Financial assets:
Securities available for sale	506,544	577,015
Derivative assets	32,923	27,141
Deposits [Abstract]
Derivative Liabilities	32,923	27,196
Recurring | Significant Unobservable Inputs (Level 3)
Financial assets:
Securities available for sale	7,460	0
Derivative assets	0	0
Deposits [Abstract]
Derivative Liabilities	0	0
Recurring | Carrying Amount
Financial assets:
Cash and due from financial institutions	52,563	29,309
Interest-earning deposits in other financial institutions	23,017	26,560
Equity investments	2,811	2,830
Securities available for sale	569,004	632,589
Securities held to maturity	1,804	2,424
FHLBNY and FRBNY stock	4,053	8,197
Loans, net and loans held for sale	1,910,436	1,809,789
Accrued interest receivable	9,422	8,682
Derivative assets	32,923	27,141
Deposits [Abstract]
Demand, savings, and insured money market accounts	1,882,311	1,924,843
Time deposits	591,188	402,384
FHLBNY overnight advances	0	95,810
Accrued interest payable	4,089	864
Derivative Liabilities	32,923	27,196
Recurring | Estimated Fair Value
Financial assets:
Cash and due from financial institutions	52,563	29,309
Interest-earning deposits in other financial institutions	23,017	26,560
Equity investments	2,811	2,830
Securities available for sale	569,004	632,589
Securities held to maturity	1,779	2,402
Loans, net and loans held for sale	1,830,014	1,757,171
Accrued interest receivable	9,422	8,682
Derivative assets	32,923	27,141
Deposits [Abstract]
Demand, savings, and insured money market accounts	1,882,311	1,924,843
Time deposits	593,637	403,572
FHLBNY overnight advances	0	95,819
Accrued interest payable	4,089	864
Derivative Liabilities	32,923	27,196
Recurring | Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and due from financial institutions	52,563	29,309
Interest-earning deposits in other financial institutions	23,017	26,560
Equity investments	2,811	2,830
Securities available for sale	55,000	55,574
Securities held to maturity	0	0
FHLBNY and FRBNY stock	0	0
Loans, net and loans held for sale	0	0
Accrued interest receivable	233	132
Derivative assets	0	0
Deposits [Abstract]
Demand, savings, and insured money market accounts	1,882,311	1,924,843
Time deposits	0	0
FHLBNY overnight advances	0	0
Accrued interest payable	121	66
Derivative Liabilities	0	0
Recurring | Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and due from financial institutions	0	0
Interest-earning deposits in other financial institutions	0	0
Equity investments	0	0
Securities available for sale	506,544	577,015
Securities held to maturity	955	1,450
FHLBNY and FRBNY stock	0	0
Loans, net and loans held for sale	0	0
Accrued interest receivable	1,957	2,002
Derivative assets	32,923	27,141
Deposits [Abstract]
Demand, savings, and insured money market accounts	0	0
Time deposits	593,637	403,572
FHLBNY overnight advances	0	95,819
Accrued interest payable	3,968	798
Derivative Liabilities	32,923	27,196
Recurring | Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and due from financial institutions	0	0
Interest-earning deposits in other financial institutions	0	0
Equity investments	0	0
Securities available for sale	7,460	0
Securities held to maturity	824	952
FHLBNY and FRBNY stock	0	0
Loans, net and loans held for sale	1,830,014	1,757,171
Accrued interest receivable	7,232	6,548
Derivative assets	0	0
Deposits [Abstract]
Demand, savings, and insured money market accounts	0	0
Time deposits	0	0
FHLBNY overnight advances	0	0
Accrued interest payable	0	0
Derivative Liabilities	$ 0	$ 0