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Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		$ 8,374	$ 8,366	$ 8,127
Loans charged off	$ (90)	(103)	(396)	(464)
Recoveries	37	580	391	726
Net charge-off	53	(477)	5	(262)
Recovery of loan losses	(23)	(225)	(258)	(15)
Ending balance	8,103	8,374	8,103	8,374
One-to-four family residential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			850
Loans charged off	(84)	(89)	(214)	(282)
Recoveries	25	15	130	100
Ending balance	762		762
Multi-family mortgage loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			3,849
Loans charged off	0	(7)	(35)	(10)
Recoveries	8	11	26	62
Ending balance	3,722		3,722
Nonresidential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,605
Loans charged off	0	0	0	(165)
Recoveries	0	10	0	10
Ending balance	1,410		1,410
Construction and land loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			32
Recoveries	2	0	2	0
Ending balance	27		27
Commercial loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,357
Loans charged off	0	0	(140)	0
Recoveries	2	542	227	552
Ending balance	1,482		1,482
Commercial leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			655
Recoveries	0	2	5	2
Ending balance	684		684
Consumer loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			18
Loans charged off	(6)	(7)	(7)	(7)
Recoveries	0	$ 0	1	$ 0
Ending balance	$ 16		$ 16

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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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