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Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | $ 2,508 | $ 4,451
Recorded Investment, Loans Not Past Due | 1,284,133 | 1,311,339
Recorded investment, total | 1,286,641 | 1,315,790
Commercial Leases Investment Rated [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 81 | 934
Recorded Investment, Loans Not Past Due | 198,882 | 207,747
Recorded investment, total | 198,963 | 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 | 119,416 | 102,873
Recorded investment, total | 119,416 | 103,161
Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 56 | 0
Recorded Investment, Loans Not Past Due | 1,422 | 1,605
Recorded investment, total | 1,478 | 1,605
Commercial Loans Health Care [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Loans Not Past Due | 68,672 | 71,738
Recorded investment, total | 68,672 | 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 | 49,369 | 40,237
Recorded investment, total | 49,369 | 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 | 46,281 | 40,935
Recorded investment, total | 46,281 | 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 | 228 | 259
Recorded investment, total | 228 | 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 | 1,090 | 1,103
Recorded investment, total | 1,090 | 1,103
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 608
Recorded Investment, Loans Not Past Due | 152,781 | 166,071
Recorded investment, total | 152,781 | 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 | 296,921 | 296,440
Recorded investment, total | 296,921 | 296,440
Multi Family Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 536
Recorded Investment, Loans Not Past Due | 267,915 | 287,171
Recorded investment, total | 267,915 | 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 | 98 | 99
Recorded Investment, Loans Not Past Due | 16,831 | 20,944
Recorded investment, total | 16,929 | 21,043
One to Four Family Residential Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 2,273 | 1,986
Recorded Investment, Loans Not Past Due | 64,325 | 74,216
Recorded investment, total | 66,598 | 76,202
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 291 | 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 | 81 | 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 | 49 | 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 | 0 | 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 | 8 | 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 | 153 | 86
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 673 | 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 | 1 | 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 | 43 | 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 | 629 | 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 | 1,544 | 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 | 6 | 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 | 0 | 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 | 47 | 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 | $ 1,491 | $ 1,801

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