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Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | $ 4,931 | $ 4,451
Recorded investment, loans not past due | 1,321,501 | 1,311,339
Recorded investment, total | 1,326,432 | 1,315,790
One-to-four family residential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 3,179 | 1,986
Recorded investment, loans not past due | 53,820 | 74,216
Recorded investment, total | 56,999 | 76,202
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 | 475 | 99
Recorded investment, loans not past due | 12,460 | 20,944
Recorded investment, total | 12,935 | 21,043
Multi-family mortgage loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 458 | 536
Recorded investment, loans not past due | 275,283 | 287,171
Recorded investment, total | 275,741 | 287,707
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 | 340,470 | 296,440
Recorded investment, total | 340,470 | 296,440
Nonresidential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 270 | 608
Recorded investment, loans not past due | 149,271 | 166,071
Recorded investment, total | 149,541 | 166,679
Construction loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Recorded investment, loans not past due | 0 | 1,103
Recorded investment, total | 0 | 1,103
Land loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Recorded investment, loans not past due | 169 | 259
Recorded investment, total | 169 | 259
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 | 39,712 | 40,935
Recorded investment, total | 39,712 | 40,935
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 | 62,719 | 40,237
Recorded investment, total | 62,719 | 40,237
Commercial Loans - Health Care [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded investment, loans not past due | 85,418 | 71,738
Recorded investment, total | 85,418 | 71,738
Commercial Leases - Investment rated commercial leases [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 505 | 934
Recorded investment, loans not past due | 166,713 | 207,747
Recorded investment, total | 167,218 | 208,681
Commercial Leases - Below Investment Grade [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 288
Recorded investment, loans not past due | 133,958 | 102,873
Recorded investment, total | 133,958 | 103,161
Consumer loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 44 | 0
Recorded investment, loans not past due | 1,508 | 1,605
Recorded investment, total | 1,552 | 1,605
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 2,770 | 2,098
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 | 1,380 | 86
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 | 387 | 10
30-59 Days Past Due [Member] | Multi-family mortgage loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 458 | 172
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 | 608
30-59 Days Past Due [Member] | Construction 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 | 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 | 505 | 934
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 | 0 | 288
30-59 Days Past Due [Member] | Consumer loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 40 | 0
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 921 | 102
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 | 637 | 99
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 | 10 | 3
60-89 Days Past Due [Member] | Multi-family mortgage loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 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 | 270 | 0
60-89 Days Past Due [Member] | Construction loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
60-89 Days Past Due [Member] | Land 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 - 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 | 0 | 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 | 4 | 0
90 Days or Greater Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 1,240 | 2,251
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 | 1,162 | 1,801
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 | 78 | 86
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 | 364
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 | 0 | 0
90 Days or Greater Past Due [Member] | Construction loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 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 | 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 - Health Care [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 | 0 | 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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