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Loans Receivable - Loans Individually Evaluated for Impairment (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | $ 1,274,300,000 | $ 1,274,300,000 | $ 1,331,194,000 |  |  |  |
Loans individually evaluated for impairment by class loans |  |  |  |  |  |  |
Loan Balance |  |  | 3,491,000 |  |  |  |
Recorded Investment |  |  | 2,854,000 |  |  |  |
Partial Charge-off |  |  | 618,000 |  |  |  |
Average Investment in Impaired Loans |  |  | 4,164,000 |  |  |  |
Interest Income Recognized |  |  | 80,000 |  |  |  |
Allowance for loan losses (With an allowance recorded) | 0 | 0 | 27,000 |  |  |  |
Impaired Loan, Total | 5,873,000 | 5,873,000 | 3,847,000 |  |  |  |
Recorded Investment, Total | 5,111,000 | 5,111,000 | 3,124,000 |  |  |  |
Partial Charge-offs, Total | 741,000 | 741,000 | 711,000 |  |  |  |
Average Investment in Impaired Loans, Total | 3,777,000 | 3,402,000 | 4,185,000 |  |  |  |
Interest Income Recognized, Total | 21,000 | 73,000 | 80,000 |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 7,824,000 | 7,824,000 | 8,443,000 |  |  |  |
Net deferred loan origination costs | 978,000 | 978,000 | 1,069,000 |  |  |  |
Loans and Leases Receivable, Allowance | 7,824,000 | 7,824,000 | 8,470,000 | $ 8,354,000 | $ 8,179,000 | $ 8,341,000 | $ 8,366,000
Financing Receivable, Individually Evaluated for Impairment | 5,140,000 | 5,140,000 | 3,141,000 |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 1,269,160,000 | 1,269,160,000 | 1,328,053,000 |  |  |  |
Loans, net | 1,267,454,000 | 1,267,454,000 | 1,323,793,000 |  |  |  |
One-to-four family residential real estate loans [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 64,192,000 | 64,192,000 | 70,371,000 |  |  |  |
Loans individually evaluated for impairment by class loans |  |  |  |  |  |  |
Loan Balance | 2,818,000 | 2,818,000 | 2,751,000 |  |  |  |
Recorded Investment | 2,227,000 | 2,227,000 | 2,155,000 |  |  |  |
Partial Charge-off | 564,000 | 564,000 | 575,000 |  |  |  |
Average Investment in Impaired Loans | 2,263,000 | 2,238,000 | 3,274,000 |  |  |  |
Interest Income Recognized | 12,000 | 26,000 | 41,000 |  |  |  |
Allowance for loan losses (With an allowance recorded) | 0 | 0 | 0 |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 563,000 | 563,000 | 699,000 |  |  |  |
Loans and Leases Receivable, Allowance | 563,000 | 563,000 | 699,000 |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | 2,420,000 | 2,420,000 | 2,218,000 |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 61,772,000 | 61,772,000 | 68,153,000 |  |  |  |
One-to-four family residential real estate loans - non-owner occupied loans [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 12,027,000 | 12,027,000 | 13,202,000 |  |  |  |
Loans individually evaluated for impairment by class loans |  |  |  |  |  |  |
Loan Balance | 221,000 | 221,000 | 86,000 |  |  |  |
Recorded Investment | 169,000 | 169,000 | 46,000 |  |  |  |
Partial Charge-off | 56,000 | 56,000 | 43,000 |  |  |  |
Average Investment in Impaired Loans | 101,000 | 77,000 | 95,000 |  |  |  |
Interest Income Recognized | 0 | 1,000 | 0 |  |  |  |
Multi-family mortgage loans [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 619,898,000 | 619,898,000 | 619,870,000 |  |  |  |
Loans individually evaluated for impairment by class loans |  |  |  |  |  |  |
Loan Balance | 637,000 | 637,000 | 654,000 |  |  |  |
Recorded Investment | 635,000 | 635,000 | 653,000 |  |  |  |
Partial Charge-off | 0 | 0 | 0 |  |  |  |
Average Investment in Impaired Loans | 642,000 | 646,000 | 795,000 |  |  |  |
Interest Income Recognized | 9,000 | 19,000 | 39,000 |  |  |  |
Allowance for loan losses (With an allowance recorded) | 0 | 0 | 0 |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 3,988,000 | 3,988,000 | 3,991,000 |  |  |  |
Loans and Leases Receivable, Allowance | 3,988,000 | 3,988,000 | 3,991,000 |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | 637,000 | 637,000 | 653,000 |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 619,261,000 | 619,261,000 | 619,217,000 |  |  |  |
Multi Family Mortgage Loans without wholesale [Member] [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 267,341,000 | 267,341,000 | 279,237,000 |  |  |  |
Wholesale commercial lending [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 352,557,000 | 352,557,000 | 340,633,000 |  |  |  |
Nonresidential real estate loans [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 145,416,000 | 145,416,000 | 152,442,000 |  |  |  |
Loans individually evaluated for impairment by class loans |  |  |  |  |  |  |
Loan Balance | 2,197,000 | 2,197,000 |  |  |  |  |
Recorded Investment | 2,080,000 | 2,080,000 |  |  |  |  |
Partial Charge-off | 121,000 | 121,000 |  |  |  |  |
Average Investment in Impaired Loans | 771,000 | 441,000 |  |  |  |  |
Interest Income Recognized | 0 | 27,000 |  |  |  |  |
Allowance for loan losses (With an allowance recorded) | 0 | 0 | 27,000 |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 1,195,000 | 1,195,000 | 1,449,000 |  |  |  |
Loans and Leases Receivable, Allowance | 1,195,000 | 1,195,000 | 1,476,000 |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | 2,083,000 | 2,083,000 | 270,000 |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 143,333,000 | 143,333,000 | 152,172,000 |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  | 356,000 |  |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 270,000 |  |  |  |
Impaired Financing Receivable, with Related Allowance, Partial Charge-offs |  |  | 93,000 |  |  |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  |  | 21,000 |  |  |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method |  |  | 0 |  |  |  |
Land loans [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 117,000 | 117,000 | 172,000 |  |  |  |
Commercial loans - Secured [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 29,514,000 | 29,514,000 | 39,574,000 |  |  |  |
Commercial loans - other [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 145,959,000 | 145,959,000 | 133,185,000 |  |  |  |
Consumer loans [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 1,861,000 | 1,861,000 | 1,539,000 |  |  |  |
Loans individually evaluated for impairment by class loans |  |  |  |  |  |  |
Allowance for loan losses (With an allowance recorded) | 0 | 0 | 0 |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 31,000 | 31,000 | 28,000 |  |  |  |
Loans and Leases Receivable, Allowance | 31,000 | 31,000 | 28,000 |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | 0 | 0 | 0 |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 1,861,000 | 1,861,000 | 1,539,000 |  |  |  |
Construction And Land Loans [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 117,000 | 117,000 | 172,000 |  |  |  |
Loans individually evaluated for impairment by class loans |  |  |  |  |  |  |
Allowance for loan losses (With an allowance recorded) | 0 | 0 | 0 |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 3,000 | 3,000 | 4,000 |  |  |  |
Loans and Leases Receivable, Allowance | 3,000 | 3,000 | 4,000 |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | 0 | 0 | 0 |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 117,000 | 117,000 | 172,000 |  |  |  |
Commercial Loan [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 153,709,000 | 153,709,000 | 187,406,000 |  |  |  |
Loans individually evaluated for impairment by class loans |  |  |  |  |  |  |
Allowance for loan losses (With an allowance recorded) | 0 | 0 | 0 |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 1,294,000 | 1,294,000 | 1,517,000 |  |  |  |
Loans and Leases Receivable, Allowance | 1,294,000 | 1,294,000 | 1,517,000 |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | 0 | 0 | 0 |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 153,709,000 | 153,709,000 | 187,406,000 |  |  |  |
Finance Leases Financing Receivable [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | 289,107,000 | 289,107,000 | 299,394,000 |  |  |  |
Loans individually evaluated for impairment by class loans |  |  |  |  |  |  |
Allowance for loan losses (With an allowance recorded) | 0 | 0 | 0 |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 750,000 | 750,000 | 755,000 |  |  |  |
Loans and Leases Receivable, Allowance | 750,000 | 750,000 | 755,000 |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | 0 | 0 | 0 |  |  |  |
Financing Receivable, Collectively Evaluated for Impairment | 289,107,000 | 289,107,000 | 299,394,000 |  |  |  |
One to Four Family Residential Real Estate Loans-Owner occupied [Member] [Member] |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |
Total loans | $ 52,165,000 | $ 52,165,000 | $ 57,169,000 |  |  |  |

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