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Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | $ 3,324 | $ 4,451
Recorded Investment, Loans Not Past Due | 1,266,207 | 1,311,339
Recorded investment, total | 1,269,531 | 1,315,790
Commercial Leases Investment Rated [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 787 | 934
Recorded Investment, Loans Not Past Due | 181,402 | 207,747
Recorded investment, total | 182,189 | 208,681
Commercial Loans Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 288
Recorded Investment, Loans Not Past Due | 116,651 | 102,873
Recorded investment, total | 116,651 | 103,161
Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 17 | 0
Recorded Investment, Loans Not Past Due | 1,410 | 1,605
Recorded investment, total | 1,427 | 1,605
Commercial Loans Health Care [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Loans Not Past Due | 69,248 | 71,738
Recorded investment, total | 69,248 | 71,738
Commercial Loans Municipal [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Recorded Investment, Loans Not Past Due | 48,942 | 40,237
Recorded investment, total | 48,942 | 40,237
Commercial loans - unsecured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
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 | 50,105 | 40,935
Recorded investment, total | 50,105 | 40,935
Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Recorded Investment, Loans Not Past Due | 198 | 259
Recorded investment, total | 198 | 259
Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Recorded Investment, Loans Not Past Due | 932 | 1,103
Recorded investment, total | 932 | 1,103
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 607 | 608
Recorded Investment, Loans Not Past Due | 146,394 | 166,071
Recorded investment, total | 147,001 | 166,679
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 | 299,469 | 296,440
Recorded investment, total | 299,469 | 296,440
Multi Family Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 102 | 536
Recorded Investment, Loans Not Past Due | 275,714 | 287,171
Recorded investment, total | 275,816 | 287,707
One To Four Family Residential Real Estate Loans Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 90 | 99
Recorded Investment, Loans Not Past Due | 15,817 | 20,944
Recorded investment, total | 15,907 | 21,043
One to Four Family Residential Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 1,721 | 1,986
Recorded Investment, Loans Not Past Due | 59,925 | 74,216
Recorded investment, total | 61,646 | 76,202
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 1,832 | 2,098
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Leases Investment Rated [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 787 | 934
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Loans Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 288
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 12 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Loans Municipal [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loans - unsecured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loans - Secured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 607 | 608
Financing Receivables, 30 to 59 Days Past Due [Member] | Wholesale Commercial Lending [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Multi Family Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 172
Financing Receivables, 30 to 59 Days Past Due [Member] | One To Four Family Residential Real Estate Loans Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 34 | 10
Financing Receivables, 30 to 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 | 392 | 86
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 13 | 102
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Leases Investment Rated [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due |  | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 5 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans Health Care [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Loans Municipal [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial loans - unsecured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial loans - Secured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Wholesale Commercial Lending [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, 60 to 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
Financing Receivables, 60 to 89 Days Past Due [Member] | One To Four Family Residential Real Estate Loans Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 8 | 3
Financing Receivables, 60 to 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 | 0 | 99
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Leases Investment Rated [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 1,479 | 2,251
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans Health Care [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Loans Municipal [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial loans - unsecured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial loans - Secured [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Wholesale Commercial Lending [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Multi Family Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 102 | 364
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | One To Four Family Residential Real Estate Loans Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 48 | 86
Financing Receivables, Equal to Greater than 90 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 | $ 1,329 | $ 1,801

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