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Loans Receivable and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 USD ($) loan | Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Amount | $ 28,228 |  | $ 28,228 |  | $ 28,466
Number of Contracts | loan | 0 | 4 | 2 | 9 |
Pre-Modification Outstanding Recorded Investments |  | $ 3,571 | $ 819 | $ 6,726 |
Post-Modification Outstanding Recorded Investments |  | $ 3,770 | 819 | $ 7,187 |
Accrual [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Amount | $ 20,693 |  | 20,693 |  | 20,058
Non-Accrual [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Amount | $ 7,535 |  | $ 7,535 |  | $ 8,408
Originated loans [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Contracts | loan |  | 1 | 1 | 5 |
Pre-Modification Outstanding Recorded Investments |  | $ 2,804 | $ 640 | $ 5,886 |
Post-Modification Outstanding Recorded Investments |  | $ 2,851 | $ 640 | $ 6,164 |
Originated loans [Member] | Residential [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Contracts | loan |  |  | 1 | 2 |
Pre-Modification Outstanding Recorded Investments |  |  | $ 640 | $ 1,445 |
Post-Modification Outstanding Recorded Investments |  |  | $ 640 | $ 1,556 |
Originated loans [Member] | Commercial and Multi-family [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Contracts | loan |  | 1 |  | 3 |
Pre-Modification Outstanding Recorded Investments |  | $ 2,804 |  | $ 4,441 |
Post-Modification Outstanding Recorded Investments |  | $ 2,851 |  | $ 4,608 |
Acquired loans recorded at fair value [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Contracts | loan |  | 3 | 1 | 4 |
Pre-Modification Outstanding Recorded Investments |  | $ 767 | $ 179 | $ 840 |
Post-Modification Outstanding Recorded Investments |  | $ 919 | $ 179 | $ 1,023 |
Acquired loans recorded at fair value [Member] | Residential [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Contracts | loan |  | 3 | 1 | 4 |
Pre-Modification Outstanding Recorded Investments |  | $ 767 | $ 179 | $ 840 |
Post-Modification Outstanding Recorded Investments |  | $ 919 | $ 179 | $ 1,023 |

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