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Loans Receivable (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loans receivable |  |  |
Total loans | $ 1,331,194,000 | $ 1,321,751,000 |
Net deferred loan origination costs | 1,069,000 | 1,266,000 |
Allowance for loan losses | (8,470,000) | (8,366,000) | $ (8,127,000)
Loans, net | 1,323,793,000 | 1,314,651,000 |
One-to-four family residential real estate loans [Member] |  |  |
Loans receivable |  |  |
Total loans | 70,371,000 | 97,814,000 |
Allowance for loan losses | (699,000) | (850,000) |
Multi-family mortgage loans [Member] |  |  |
Loans receivable |  |  |
Total loans | 619,870,000 | 588,383,000 |
Allowance for loan losses | (3,991,000) | (3,849,000) |
Nonresidential Real Estate [Member] |  |  |
Loans receivable |  |  |
Total loans | 152,442,000 | 169,971,000 |
Allowance for loan losses | (1,476,000) | (1,605,000) |
Construction and land loans [Member] |  |  |
Loans receivable |  |  |
Total loans | 172,000 | 1,358,000 |
Allowance for loan losses | (4,000) | (32,000) |
Commercial loans [Member] |  |  |
Loans receivable |  |  |
Total loans | 187,406,000 | 152,552,000 |
Allowance for loan losses | (1,517,000) | (1,357,000) |
Commercial leases [Member] |  |  |
Loans receivable |  |  |
Total loans | 299,394,000 | 310,076,000 |
Allowance for loan losses | (755,000) | (655,000) |
Consumer loans [Member] |  |  |
Loans receivable |  |  |
Total loans | 1,539,000 | 1,597,000 |
Allowance for loan losses | (28,000) | (18,000) |
Nonresidential real estate loans [Member] |  |  |
Loans receivable |  |  |
Total loans | $ 152,442,000 | $ 169,971,000 |
No Public Rating [Member] | Maximum [Member] | Commercial leases [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial Leases, Maturity | 5 years |  |
Collateralized Loan [Member] | Multi-family mortgage loans [Member] |  |  |
Loans receivable |  |  |
Collateralized Loan Receivable, Percentage Of Collateral Located Outside Primary Market Area | 55.00% |  |
Collateralized Loan [Member] | Nonresidential real estate loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Projected Cash Flow To Loan Debt Service Requirement | 120.00% |  |
Collateralized Loan [Member] | Maximum [Member] | Multi-family mortgage loans [Member] |  |  |
Loans receivable |  |  |
Total loans | $ 5,000,000.0 |  |
Collateralized Loan [Member] | Maximum [Member] | Nonresidential real estate loans [Member] |  |  |
Loans receivable |  |  |
Total loans | 5,000,000.0 |  |
Collateralized Loan [Member] | Minimum [Member] | Multi-family mortgage loans [Member] |  |  |
Loans receivable |  |  |
Total loans | 500,000 |  |
Collateralized Loan [Member] | Minimum [Member] | Nonresidential real estate loans [Member] |  |  |
Loans receivable |  |  |
Total loans | $ 500,000 |  |
Mortgage loans above $400,000 [Member] | Collateralized Loan [Member] | Multi-family mortgage loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Projected Cash Flow To Loan Debt Service Requirement | 120.00% |  |
Conforming Loans [Member] | $2,500,000 [Member] | Maximum [Member] | Residential Mortgage [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | $ 424,000 |  |
Adjustable Rate And Fixed Rate Residential Mortgage [Member] | $2,500,000 [Member] | Maximum [Member] | Residential Mortgage [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Face Amount of Mortgages | $ 2,500,000 |  |
First Mortgage [Member] | Residential Mortgage [Member] |  |  |
Loans receivable |  |  |
Percent Threshold On Loan To Value Ratios Requiring Private Mortgage Insurance | 80.00% |  |

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