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Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 8,341	$ 7,971	$ 8,366	$ 8,127
Loans charged off	(209)	(22)	(306)	(361)
Recoveries	24	124	354	146
Net charge-off	185	(102)	(48)	215
Provision for (recovery of) loan losses	23	49	(235)	210
Ending balance	8,179	8,122	8,179	8,122
One-to-four family residential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			850
Loans charged off	(33)	(22)	(130)	(193)
Recoveries	6	79	105	85
Ending balance	802		802
Multi-family mortgage loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			3,849
Loans charged off	(35)	0	(35)	(3)
Recoveries	10	40	18	51
Ending balance	3,690		3,690
Nonresidential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,605
Loans charged off	0	0	0	(165)
Ending balance	1,452		1,452
Construction and land loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			32
Ending balance	32		32
Commercial loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,357
Loans charged off	(140)	0	(140)	0
Recoveries	2	5	225	10
Ending balance	1,444		1,444
Commercial leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			655
Recoveries	5	0	5	0
Ending balance	746		746
Consumer loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			18
Loans charged off	(1)	0	(1)	0
Recoveries	1	$ 0	1	$ 0
Ending balance	$ 13		$ 13

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- Definition

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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