FAIR VALUE - Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financial Assets [Abstract]
Cash and due from financial institutions	$ 26,275	$ 28,205
Interest-bearing deposits in other financial institutions	99,410	45,957
Securities available for sale	302,581	303,402
Securities held to maturity	3,912	4,912
Loans, net	1,219,291	1,186,037
Accrued interest receivable	3,136	3,192
Financial liabilities [Abstract]
Securities sold under agreements to repurchase	15,215	27,606
FHLBNY term advances	9,065	9,093
Recurring
Financial Assets [Abstract]
Securities available for sale	302,581	303,402
Derivative assets	747	693
Financial liabilities [Abstract]
Derivative liabilities	812	761
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets [Abstract]
Cash and due from financial institutions	26,275	28,205
Interest-bearing deposits in other financial institutions	99,410	45,957
Trading assets	826	774
Securities available for sale	175	170
Securities held to maturity	0	0
FHLBNY and FRBNY stock	0	0
Loans, net	0	0
Loans held for sale	0	0
Accrued interest receivable	4	9
Derivative assets	0	0
Financial liabilities [Abstract]
Demand, savings, and insured money market accounts	1,403,637	1,312,237
Time deposits	0	0
Securities sold under agreements to repurchase	0	0
FHLBNY term advances	0	0
Accrued interest payable	23	25
Derivative liabilities	0	0
Recurring | Significant Other Observable Inputs (Level 2)
Financial Assets [Abstract]
Cash and due from financial institutions	0	0
Interest-bearing deposits in other financial institutions	0	0
Trading assets	0	0
Securities available for sale	302,155	302,982
Securities held to maturity	977	981
FHLBNY and FRBNY stock	0	0
Loans, net	0	0
Loans held for sale	20	412
Accrued interest receivable	909	784
Derivative assets	747	693
Financial liabilities [Abstract]
Demand, savings, and insured money market accounts	0	0
Time deposits	140,934	144,460
Securities sold under agreements to repurchase	15,398	27,880
FHLBNY term advances	9,138	9,189
Accrued interest payable	149	185
Derivative liabilities	747	693
Recurring | Significant Unobservable Inputs (Level 3)
Financial Assets [Abstract]
Cash and due from financial institutions	0	0
Interest-bearing deposits in other financial institutions	0	0
Trading assets	0	0
Securities available for sale	251	250
Securities held to maturity	2,935	3,931
FHLBNY and FRBNY stock	0	0
Loans, net	1,229,871	1,205,814
Loans held for sale	0	0
Accrued interest receivable	3,153	3,207
Derivative assets	0	0
Financial liabilities [Abstract]
Demand, savings, and insured money market accounts	0	0
Time deposits	0	0
Securities sold under agreements to repurchase	0	0
FHLBNY term advances	0	0
Accrued interest payable	0	0
Derivative liabilities	65	68
Recurring | Carrying Amount
Financial Assets [Abstract]
Cash and due from financial institutions	26,275	28,205
Interest-bearing deposits in other financial institutions	99,410	45,957
Trading assets	826	774
Securities available for sale	302,581	303,402
Securities held to maturity	3,721	4,705
FHLBNY and FRBNY stock	3,597	4,041
Loans, net	1,219,291	1,186,037
Loans held for sale	20	412
Accrued interest receivable	4,066	4,000
Derivative assets	747	693
Financial liabilities [Abstract]
Demand, savings, and insured money market accounts	1,403,637	1,312,237
Time deposits	140,614	144,106
Securities sold under agreements to repurchase	15,215	27,606
FHLBNY term advances	9,065	9,093
Accrued interest payable	172	210
Derivative liabilities	812	761
Recurring | Estimated Fair Value
Financial Assets [Abstract]
Cash and due from financial institutions	26,275	28,205
Interest-bearing deposits in other financial institutions	99,410	45,957
Trading assets	826	774
Securities available for sale	302,581	303,402
Securities held to maturity	3,912	4,912
Loans, net	1,229,871	1,205,814
Loans held for sale	20	412
Accrued interest receivable	4,066	4,000
Derivative assets	747	693
Financial liabilities [Abstract]
Demand, savings, and insured money market accounts	1,403,637	1,312,237
Time deposits	140,934	144,460
Securities sold under agreements to repurchase	15,398	27,880
FHLBNY term advances	9,138	9,189
Accrued interest payable	172	210
Derivative liabilities	$ 812	$ 761