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Acquisition of IA Bancorp, Inc. (Narrative) (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 17, 2018 | Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |
Merger related costs |  | $ 2,039,000 | $ 2,184,000 |
Certificates of Deposit [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Amortization period of fair value adjustment |  |  | 5 years |
IA Bancorp [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Share exchange rate | 0.189 |  |  |
Fair value adjustment on pools of homogeneous loans, interest rate discount |  |  | $ 1,900,000 |
Fair value adjustment on pools of homogeneous loans, credit discount |  |  | 3,900,000 |
Merger related costs |  |  | 2,200,000 | $ 800,000
Merger related costs, early termination fees |  |  | 2,000,000 |
IA Bancorp [Member] | Certificates of Deposit [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value adjustment, liabilities |  |  | $ 751,000 |

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