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Loans Receivable - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	$ 8,112	$ 8,354	$ 7,632	$ 8,470
Provision for Loan and Lease Losses	471	(87)
Allowance for Loan and Lease Losses, Write-offs	(18)	(56)
Recoveries	27	27
Allowance for loan losses and the loans receivable by portfolio segment
Net deferred loan origination costs	848		912
Loans, net	1,147,628		1,168,008
One-to-four family residential real estate loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	682	649	675	699
Provision for Loan and Lease Losses	(1)	(44)
Allowance for Loan and Lease Losses, Write-offs	(5)	(23)
Recoveries	13	17
Multi-family mortgage loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	3,869	4,079	3,676	3,991
Provision for Loan and Lease Losses	181	80
Allowance for Loan and Lease Losses, Write-offs	0	0
Recoveries	12	8
Nonresidential real estate loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	1,460	1,487	1,176	1,476
Provision for Loan and Lease Losses	284	39
Allowance for Loan and Lease Losses, Write-offs	0	(28)
Commercial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	1,275		1,308
Allowance for Loan and Lease Losses, Write-offs	0	0
Recoveries	2	2
Commercial leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	780	690	757	755
Provision for Loan and Lease Losses	23	(65)
Recoveries	0	0
Consumer loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	46		40
Allowance for Loan and Lease Losses, Write-offs	(13)	(5)
Recoveries	0	0
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for Loan and Lease Losses	19	1
Commercial Loans Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	1,275	1,422	1,308	1,517
Provision for Loan and Lease Losses	(35)	(97)
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Allowance	$ 46	$ 24	$ 40	$ 28

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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 deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Amount of expense related to estimated loss from loan and lease transactions.

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