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Loans Receivable - Past Due Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | $ 2,629 | $ 4,931
Recorded Investment, Loans Not Past Due | 1,308,154 | 1,321,501
Recorded investment, total | 1,310,783 | 1,326,432
Commercial Leases Investment Rated [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 336 | 505
Recorded Investment, Loans Not Past Due | 158,095 | 166,713
Recorded investment, total | 158,431 | 167,218
Commercial Loans Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 37 | 0
Recorded Investment, Loans Not Past Due | 133,324 | 133,958
Recorded investment, total | 133,361 | 133,958
Consumer Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 12 | 44
Recorded Investment, Loans Not Past Due | 1,847 | 1,508
Recorded investment, total | 1,859 | 1,552
Commercial Loans Health Care [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Loans Not Past Due | 85,048 | 85,418
Recorded investment, total | 85,048 | 85,418
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 | 49,975 | 62,719
Recorded investment, total | 49,975 | 62,719
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 | 37,719 | 39,712
Recorded investment, total | 37,719 | 39,712
Land Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 0
Recorded Investment, Loans Not Past Due | 142 | 169
Recorded investment, total | 142 | 169
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 525 | 270
Recorded Investment, Loans Not Past Due | 146,566 | 149,271
Recorded investment, total | 147,091 | 149,541
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 | 357,588 | 340,470
Recorded investment, total | 357,588 | 340,470
Multi Family Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 458
Recorded Investment, Loans Not Past Due | 273,114 | 275,283
Recorded investment, total | 273,114 | 275,741
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 | 321 | 475
Recorded Investment, Loans Not Past Due | 12,141 | 12,460
Recorded investment, total | 12,462 | 12,935
One to Four Family Residential Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 1,398 | 3,179
Recorded Investment, Loans Not Past Due | 52,595 | 53,820
Recorded investment, total | 53,993 | 56,999
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 1,362 | 2,770
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 | 336 | 505
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 | 37 | 0
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 | 6 | 40
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] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 283 | 0
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 | 458
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 | 141 | 387
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 | 559 | 1,380
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 188 | 921
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 | 6 | 4
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] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 0 | 270
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 | 147 | 10
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 | 35 | 637
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 | 1,079 | 1,240
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] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Recorded Investment, Total Past Due | 242 | 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 | 0
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 | 33 | 78
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 | $ 804 | $ 1,162

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