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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 7,824	$ 8,179	$ 8,470	$ 8,366
Loans charged off	(104)	(90)	(4,663)	(396)
Recoveries	17	37	60	391
Net charge-off	87	53	4,603	5
Provision for (recovery of) loan losses	134	23	(3,736)	258
Ending balance	7,603	8,103	7,603	8,103
One-to-four family residential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			699
Loans charged off	(44)	(84)	(117)	(214)
Recoveries	5	25	28	130
Ending balance	580		580
Multi-family mortgage loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			3,991
Loans charged off	0	0	0	(35)
Recoveries	8	8	24	26
Ending balance	3,728		3,728
Nonresidential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,476
Loans charged off	(55)	0	(83)	0
Ending balance	1,217		1,217
Construction and land loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			4
Ending balance	2		2
Commercial loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			1,517
Loans charged off	0	0	(4,443)	(140)
Recoveries	4	2	8	227
Ending balance	1,308		1,308
Commercial leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			755
Recoveries	0	0	0	5
Ending balance	732		732
Consumer loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance			28
Loans charged off	(5)	(6)	(20)	(7)
Recoveries	0	$ 0	0	$ 1
Ending balance	$ 36		$ 36

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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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-Publisher FASB
-Name Accounting Standards Codification
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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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