FAIR VALUES - Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial assets:
Cash and due from financial institutions	$ 33,040	$ 27,966
Interest-earning deposits in other financial institutions	96,932	2,763
Securities available for sale	242,258	293,091
Securities held to maturity	4,875	3,781
Loans, net and loans held for sale (2)	1,292,962	1,290,663
Loans held for sale	502	542
Accrued interest receivable	3,703	3,758
Deposits:
Time deposits	150,226	118,362
Securities sold under agreements to repurchase	0	10,000	$ 27,606
FHLBNY overnight advances	0	57,700
FHLBNY term advances	0	2,000
Carrying Amount
Financial assets:
Cash and due from financial institutions	33,040	27,966
Interest-earning deposits in other financial institutions	96,932	2,763
Equity investments	1,909	1,192
Securities available for sale	242,258	293,091
Securities held to maturity	4,875	3,781
FHLBNY and FRBNY stock	3,138	5,784
Loans, net and loans held for sale (2)	1,293,464	1,290,663
Loans held for sale		542
Accrued interest receivable	4,480	4,642
Derivative assets	3,142	974
Deposits:
Demand, savings, and insured money market accounts	1,419,011	1,349,084
Time deposits	150,226	118,362
Securities sold under agreements to repurchase	0	10,000
FHLBNY overnight advances	0	57,700
FHLBNY term advances	0	2,000
Accrued interest payable	232	148
Derivative liabilities	3,282	1,049
Estimated Fair Value
Financial assets:
Cash and due from financial institutions	33,040	27,966
Interest-earning deposits in other financial institutions	96,932	2,763
Equity investments	1,909	1,192
Securities available for sale	242,258	293,091
Securities held to maturity	4,858	3,776
Loans, net and loans held for sale (2)	1,287,495	1,289,584
Loans held for sale		542
Accrued interest receivable	4,480	4,642
Derivative assets	3,142	974
Deposits:
Demand, savings, and insured money market accounts	1,419,011	1,349,084
Time deposits	150,938	118,598
Securities sold under agreements to repurchase	0	10,058
FHLBNY overnight advances	0	57,700
FHLBNY term advances	0	2,001
Accrued interest payable	232	148
Derivative liabilities	3,282	1,049
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and due from financial institutions	33,040	27,966
Interest-earning deposits in other financial institutions	96,932	2,763
Equity investments	1,909	1,192
Securities available for sale	0	0
Securities held to maturity	0	0
FHLBNY and FRBNY stock	0	0
Loans, net and loans held for sale (2)	0	0
Loans held for sale		0
Accrued interest receivable	80	1
Derivative assets	0	0
Deposits:
Demand, savings, and insured money market accounts	1,419,011	1,349,084
Time deposits	0	0
Securities sold under agreements to repurchase	0	0
FHLBNY overnight advances	0	0
FHLBNY term advances	0	0
Accrued interest payable	26	24
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
Equity investments	0	0
Securities available for sale	242,258	293,091
Securities held to maturity	1,838	1,830
FHLBNY and FRBNY stock	0	0
Loans, net and loans held for sale (2)	0	0
Loans held for sale		542
Accrued interest receivable	697	867
Derivative assets	3,142	974
Deposits:
Demand, savings, and insured money market accounts	0	0
Time deposits	150,938	118,598
Securities sold under agreements to repurchase	0	10,058
FHLBNY overnight advances	0	57,700
FHLBNY term advances	0	2,001
Accrued interest payable	206	124
Derivative liabilities		974
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	0	0
Securities held to maturity	3,020	1,946
FHLBNY and FRBNY stock	0	0
Loans, net and loans held for sale (2)	1,287,495	1,289,584
Loans held for sale		0
Accrued interest receivable	3,703	3,774
Derivative assets	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	0
FHLBNY term advances	0	0
Accrued interest payable	$ 0	0
Derivative liabilities		$ 75