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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 8,354	$ 8,341	$ 8,470	$ 8,366
Loans charged off	(4,503)	(209)	(4,559)	(306)
Recoveries	16	24	43	354
Net charge-off	4,487	185	4,516	(48)
Provision for (recovery of) loan losses	(3,957)	(23)	(3,870)	235
Ending balance	7,824	8,179	7,824	8,179
One-to-four family residential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			699
Loans charged off	(50)	(33)	(73)	(130)
Recoveries	6	6	23	105
Ending balance	563		563
Multi-family mortgage loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			3,991
Loans charged off	0	(35)	0	(35)
Recoveries	8	10	16	18
Ending balance	3,988		3,988
Nonresidential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,476
Loans charged off	0	0	(28)	0
Ending balance	1,195		1,195
Construction and land loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			4
Ending balance	3		3
Commercial loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,517
Loans charged off	(4,443)	(140)	(4,443)	(140)
Recoveries	2	2	4	225
Ending balance	1,294		1,294
Commercial leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			755
Recoveries	0	5	0	5
Ending balance	750		750
Consumer loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			28
Loans charged off	(10)	(1)	(15)	(1)
Recoveries	0	$ 1	0	$ 1
Ending balance	$ 31		$ 31

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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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