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Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 8,470	$ 8,366
Loans charged off	(56)	(97)
Recoveries	27	330
Net charge-off	29	(233)
Recovery of loan losses	(87)	(258)
Ending balance	8,354	8,341
One-to-four family residential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	699
Loans charged off	(23)	(97)
Recoveries	17	99
Ending balance	649
Multi-family mortgage loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,991
Recoveries	8	8
Ending balance	4,079
Nonresidential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,476
Loans charged off	(28)	0
Ending balance	1,487
Construction and land loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4
Ending balance	3
Commercial loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,517
Recoveries	2	223
Ending balance	1,422
Commercial leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	755
Ending balance	690
Consumer loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	28
Loans charged off	(5)	$ 0
Ending balance	$ 24

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Allowance for loan and lease losses charge offs, net.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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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 expense related to estimated loss from loan and lease transactions.

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