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Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Loans receivable
Total loans	$ 1,220,609		$ 1,331,194
Net deferred loan origination costs	942		1,069
Allowance for loan losses	(7,603)	$ (7,824)	(8,470)	$ (8,103)	$ (8,179)	$ (8,366)
Loans, net	1,213,948		1,323,793
One-to-four family residential real estate loans [Member]
Loans receivable
Total loans	60,757		70,371
Allowance for loan losses	(580)		(699)
Multi-family mortgage loans [Member]
Loans receivable
Total loans	577,656		619,870
Allowance for loan losses	(3,728)		(3,991)
Nonresidential real estate loans [Member]
Loans receivable
Total loans	140,410		152,442
Allowance for loan losses	(1,217)		(1,476)
Construction and land loans [Member]
Loans receivable
Total loans	88		172
Allowance for loan losses	(2)		(4)
Commercial loans [Member]
Loans receivable
Total loans	163,846		187,406
Allowance for loan losses	(1,308)		(1,517)
Commercial leases [Member]
Loans receivable
Total loans	275,800		299,394
Allowance for loan losses	(732)		(755)
Consumer loans [Member]
Loans receivable
Total loans	2,052		1,539
Allowance for loan losses	$ (36)		$ (28)

X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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