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Loans Receivable - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for loan losses and the loans receivable by portfolio segment
Individually evaluated for impairment	$ 0	$ 27
Collectively evaluated for impairment	7,632	8,443
Allowance for loan losses	7,632	8,470	$ 8,366
Individually evaluated for impairment	2,743	3,141
Collectively evaluated for impairment	1,171,985	1,328,053
Total loans	1,174,728	1,331,194
Net deferred loan origination costs	912	1,069
Loans, net	1,168,008	1,323,793
One-to-four family residential real estate loans [Member]
Allowance for loan losses and the loans receivable by portfolio segment
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	675	699
Allowance for loan losses	675	699	850
Individually evaluated for impairment	1,835	2,218
Collectively evaluated for impairment	53,915	68,153
Total loans	55,750	70,371
Multi-family mortgage loans [Member]
Allowance for loan losses and the loans receivable by portfolio segment
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3,676	3,991
Allowance for loan losses	3,676	3,991	3,849
Individually evaluated for impairment	620	653
Collectively evaluated for impairment	563,130	619,217
Total loans	563,750	619,870
Nonresidential Real Estate [Member]
Allowance for loan losses and the loans receivable by portfolio segment
Individually evaluated for impairment	0	27
Collectively evaluated for impairment	1,176	1,449
Allowance for loan losses	1,176	1,476
Individually evaluated for impairment	288	270
Collectively evaluated for impairment	134,386	152,172
Total loans	134,674	152,442
Construction and land loans [Member]
Allowance for loan losses and the loans receivable by portfolio segment
Individually evaluated for impairment		0
Collectively evaluated for impairment		4
Allowance for loan losses		4
Individually evaluated for impairment		0
Collectively evaluated for impairment		172
Total loans	0	172
Commercial loans [Member]
Allowance for loan losses and the loans receivable by portfolio segment
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,308	1,517
Allowance for loan losses	1,308	1,517
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	145,714	187,406
Total loans	145,714	187,406
Commercial leases [Member]
Allowance for loan losses and the loans receivable by portfolio segment
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	757	755
Allowance for loan losses	757	755	$ 655
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	272,629	299,394
Total loans	272,629	299,394
Consumer loans [Member]
Allowance for loan losses and the loans receivable by portfolio segment
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	40	28
Allowance for loan losses	40	28
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,211	1,539
Total loans	$ 2,211	$ 1,539

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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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 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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