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Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 8,470				$ 8,366	$ 8,470	$ 8,366
Loans charged off									(4,779)	(518)
Recoveries									116	477
Provision for (recovery of) loan losses	$ 89	$ (134)	$ 3,957	(87)	$ 403	$ (23)	$ 23	(258)	3,825	145
Ending balance	7,632				8,470				7,632	8,470
One-to-four family residential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				699				850	699	850
Loans charged off									(222)	(231)
Recoveries									75	206
Provision for (recovery of) loan losses									123	(126)
Ending balance	675				699				675	699
Multi-family mortgage loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				3,991				3,849	3,991	3,849
Loans charged off									0	(35)
Recoveries									31	34
Provision for (recovery of) loan losses									(346)	143
Ending balance	3,676				3,991				3,676	3,991
Nonresidential real estate loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,476				1,605	1,476	1,605
Loans charged off									(83)	(93)
Provision for (recovery of) loan losses									(217)	(36)
Ending balance	1,176				1,476				1,176	1,476
Land loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				4				32	4	32
Recoveries										2
Provision for (recovery of) loan losses									(4)	(30)
Ending balance	0				4				0	4
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Provision for (recovery of) loan losses									43	28
Construction and land loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				4					4
Ending balance					4					4
Commercial loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,517					1,517
Loans charged off									(4,443)	(140)
Recoveries									10	229
Ending balance	1,308				1,517				1,308	1,517
Commercial leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				755				655	755	655
Recoveries									0	5
Provision for (recovery of) loan losses									2	95
Ending balance	757				755				757	755
Consumer loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				28					28
Loans charged off									(31)	(19)
Recoveries									0	1
Ending balance	40				28				40	28
Commercial loans - other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				1,517				1,357	1,517	1,357
Provision for (recovery of) loan losses									4,224	71
Ending balance	1,308				1,517				1,308	1,517
Consumer Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance				$ 28				$ 18	28	18
Ending balance	$ 40				$ 28				$ 40	$ 28

X

- Definition

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

+ References

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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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