FAIR VALUES - Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial assets:
Cash and due from financial institutions	$ 27,966	$ 28,205
Interest-earning deposits in other financial institutions	2,763	45,957
Securities available for sale	293,627	303,402
Securities held to maturity	3,781	4,705
Loans, net	1,290,663	1,186,037
Loans held for sale	542	412
Accrued interest receivable	3,758	3,192
Deposits:
Time deposits	118,362	144,106
Securities sold under agreements to repurchase	10,000	27,606	$ 28,453
FHLBNY overnight advances	57,700	0
FHLBNY term advances	2,000	9,093
Carrying Amount
Financial assets:
Cash and due from financial institutions	27,966	28,205
Interest-earning deposits in other financial institutions	2,763	45,957
Trading assets	988	774
Securities available for sale	293,627	303,402
Securities held to maturity	3,781	4,705
FHLBNY and FRBNY stock	5,784	4,041
Loans, net	1,290,663	1,186,037
Loans held for sale	542	412
Accrued interest receivable	4,642	4,000
Derivative Asset	974	693
Deposits:
Demand, savings, and insured money market accounts	1,349,084	1,312,237
Time deposits	118,362	144,106
Securities sold under agreements to repurchase	10,000	27,606
FHLBNY term advances	2,000	9,093
Accrued interest payable	148	210
Derivative liabilities	1,049	761
Estimated Fair Value
Financial assets:
Cash and due from financial institutions	27,966	28,205
Interest-earning deposits in other financial institutions	2,763	45,957
Trading assets	988	774
Securities available for sale	293,627	303,402
Securities held to maturity	3,776	4,912
Loans, net	1,289,584	1,205,814
Loans held for sale	542	412
Accrued interest receivable	4,642	4,000
Derivative Asset	974	693
Deposits:
Demand, savings, and insured money market accounts	1,349,084	1,312,237
Time deposits	118,598	144,460
Securities sold under agreements to repurchase	10,058	27,880
FHLBNY overnight advances	57,700
FHLBNY term advances	2,001	9,189
Accrued interest payable	148	210
Derivative liabilities	1,049	761
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and due from financial institutions	27,966	28,205
Interest-earning deposits in other financial institutions	2,763	45,957
Trading assets	988	774
Securities available for sale	204	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	1	9
Derivative Asset	0	0
Deposits:
Demand, savings, and insured money market accounts	1,349,084	1,312,237
Time deposits	0	0
Securities sold under agreements to repurchase	0	0
FHLBNY overnight advances	0
FHLBNY term advances	0	0
Accrued interest payable	24	25
Derivative liabilities	0	0
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
Trading assets	0	0
Securities available for sale	293,423	302,982
Securities held to maturity	1,830	981
FHLBNY and FRBNY stock	0	0
Loans, net	0	0
Loans held for sale	542	412
Accrued interest receivable	867	784
Derivative Asset	974	693
Deposits:
Demand, savings, and insured money market accounts	0	0
Time deposits	118,598	144,460
Securities sold under agreements to repurchase	10,058	27,880
FHLBNY overnight advances	57,700
FHLBNY term advances	2,001	9,189
Accrued interest payable	124	185
Derivative liabilities	974	693
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
Trading assets	0	0
Securities available for sale	0	250
Securities held to maturity	1,946	3,931
FHLBNY and FRBNY stock	0	0
Loans, net	1,289,584	1,205,814
Loans held for sale	0	0
Accrued interest receivable	3,774	3,207
Derivative Asset	0	0
Deposits:
Demand, savings, and insured money market accounts	0	0
Time deposits	0	0
Securities sold under agreements to repurchase	0	0
FHLBNY overnight advances	0
FHLBNY term advances	0	0
Accrued interest payable	0	0
Derivative liabilities	$ 75	$ 68