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Business Combination (Narrative) (Details) $ in Thousands | May 19, 2017 USD ($) loan | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 27,618 | $ 27,618
Northwest Bank Branches [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Loans, acquired | $ 122,862 |  |
Deposits, acquired | 212,456 |  |
Business combination cash received net of deposit premium | 64,000 |  |
Business Acquisition, Transaction Costs | 977 |  |
Goodwill | 14,985 |  |
Cash flows expected to be collected | 125,131 |  |
Accretable FMV adjustments | $ 2,269 |  |
Business Combination Acquired Loans Contractually Required Payments Receivable Number Of Loans | loan | 864 |  |
Business Combination Acquired Loans Contractually Required Payments Receivable | $ 125,131 |  |
Business Combination Acquired Loans Accretable Fair Market Value Adjustment | $ 2,269 |  |

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