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Goodwill and Other Intangibles (Narrative) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | May 19, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangibles | $ 4,051 |  | $ 299
Goodwill | 27,909 |  | $ 11,931
Core Deposits [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangibles | $ 3,822 |  |
Northwest Bank Branches [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill |  | $ 15,276 |
Northwest Bank Branches [Member] | Core Deposits [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangibles |  | $ 4,000 |

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