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Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Loans receivable
Total loans	$ 1,274,677		$ 1,321,751
Net deferred loan origination costs	1,213		1,266
Allowance for loan losses	(8,103)	$ (8,179)	(8,366)	$ (8,374)	$ (8,374)	$ (8,122)	$ (8,127)
Loans, net	1,267,787		1,314,651
One-to-four family residential real estate loans [Member]
Loans receivable
Total loans	77,591		97,814
Allowance for loan losses	(762)		(850)
Multi-family mortgage loans [Member]
Loans receivable
Total loans	581,880		588,383
Allowance for loan losses	(3,722)		(3,849)
Nonresidential real estate loans [Member]
Loans receivable
Total loans	148,010		169,971
Allowance for loan losses	(1,410)		(1,605)
Construction and land loans [Member]
Loans receivable
Total loans	1,130		1,358
Allowance for loan losses	(27)		(32)
Commercial loans [Member]
Loans receivable
Total loans	167,547		152,552
Allowance for loan losses	(1,482)		(1,357)
Commercial leases [Member]
Loans receivable
Total loans	297,103		310,076
Allowance for loan losses	(684)		(655)
Consumer loans [Member]
Loans receivable
Total loans	1,416		1,597
Allowance for loan losses	$ (16)		$ (18)

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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- Definition

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 before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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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