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Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | $ 5,103 | $ 4,940
Recorded investment, loans not past due | 1,169,625 | 1,326,254
Recorded investment, total | 1,174,728 | 1,331,194
One-to-four family residential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 1,624 | 3,189
Recorded investment, loans not past due | 43,365 | 54,155
Recorded investment, total | 44,989 | 57,344
One-to-four family residential real estate loans - non-owner occupied loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 295 | 480
Recorded investment, loans not past due | 10,466 | 12,547
Recorded investment, total | 10,761 | 13,027
Multi-family mortgage loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 1,283 | 461
Recorded investment, loans not past due | 246,680 | 278,776
Recorded investment, total | 247,963 | 279,237
Wholesale commercial lending [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Recorded investment, loans not past due | 315,787 | 340,633
Recorded investment, total | 315,787 | 340,633
Nonresidential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 288 | 270
Recorded investment, loans not past due | 134,386 | 152,172
Recorded investment, total | 134,674 | 152,442
Land loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due |  | 0
Recorded investment, loans not past due |  | 172
Recorded investment, total |  | 172
Commercial loans - Secured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Recorded investment, loans not past due | 24,853 | 39,574
Recorded investment, total | 24,853 | 39,574
Commercial loans - Unsecured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Commercial Loans - Municipal loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Commercial Loans - Warehouse Lines [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, loans not past due | 50,431 | 62,489
Recorded investment, total | 50,431 | 62,489
Commercial Loans - Health Care [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, loans not past due | 70,430 | 85,343
Recorded investment, total | 70,430 | 85,343
Commercial Leases - Investment rated commercial leases [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 873 | 498
Recorded investment, loans not past due | 132,966 | 165,711
Recorded investment, total | 133,839 | 166,209
Commercial Leases - Below Investment Grade [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 679 | 0
Recorded investment, loans not past due | 138,111 | 133,185
Recorded investment, total | 138,790 | 133,185
Consumer loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 61 | 42
Recorded investment, loans not past due | 2,150 | 1,497
Recorded investment, total | 2,211 | 1,539
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 3,431 | 2,774
30-59 Days Past Due [Member] | One-to-four family residential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 777 | 1,383
30-59 Days Past Due [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 280 | 393
30-59 Days Past Due [Member] | Multi-family mortgage loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 981 | 461
30-59 Days Past Due [Member] | Wholesale commercial lending [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
30-59 Days Past Due [Member] | Nonresidential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
30-59 Days Past Due [Member] | Land loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due |  | 0
30-59 Days Past Due [Member] | Commercial loans - Secured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
30-59 Days Past Due [Member] | Commercial Loans - Municipal loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
30-59 Days Past Due [Member] | Commercial Loans - Warehouse Lines [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
30-59 Days Past Due [Member] | Commercial Leases - Investment rated commercial leases [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 826 | 498
30-59 Days Past Due [Member] | Commercial Leases - Below Investment Grade [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 543 | 0
30-59 Days Past Due [Member] | Consumer loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 24 | 39
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 830 | 919
60-89 Days Past Due [Member] | One-to-four family residential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 340 | 638
60-89 Days Past Due [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 15 | 8
60-89 Days Past Due [Member] | Multi-family mortgage loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 302 | 0
60-89 Days Past Due [Member] | Wholesale commercial lending [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
60-89 Days Past Due [Member] | Nonresidential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 270
60-89 Days Past Due [Member] | Land loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due |  | 0
60-89 Days Past Due [Member] | Commercial loans - Secured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
60-89 Days Past Due [Member] | Commercial Loans - Municipal loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
60-89 Days Past Due [Member] | Commercial Loans - Warehouse Lines [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
60-89 Days Past Due [Member] | Commercial loans - Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 136 | 0
60-89 Days Past Due [Member] | Commercial Leases - Investment rated commercial leases [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
60-89 Days Past Due [Member] | Consumer loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 37 | 3
90 Days or Greater Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 842 | 1,247
90 Days or Greater Past Due [Member] | One-to-four family residential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 507 | 1,168
90 Days or Greater Past Due [Member] | One-to-four family residential real estate loans - non-owner occupied loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 79
90 Days or Greater Past Due [Member] | Multi-family mortgage loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
90 Days or Greater Past Due [Member] | Wholesale commercial lending [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
90 Days or Greater Past Due [Member] | Nonresidential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 288 | 0
90 Days or Greater Past Due [Member] | Land loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due |  | 0
90 Days or Greater Past Due [Member] | Commercial loans - Secured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
90 Days or Greater Past Due [Member] | Commercial Loans - Municipal loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
90 Days or Greater Past Due [Member] | Commercial Loans - Warehouse Lines [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
90 Days or Greater Past Due [Member] | Commercial loans - Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
90 Days or Greater Past Due [Member] | Commercial Leases - Investment rated commercial leases [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 47 | 0
90 Days or Greater Past Due [Member] | Consumer loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | $ 0 | $ 0

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