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Employee Benefits Employee Stock Ownership Plan (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Employee Stock Ownership Plan [Abstract]    
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares 406,371 379,860
Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares 35,283 26,511
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares 146,539 181,822
Employee Stock Ownership Plan (ESOP), Shares in ESOP 588,193 588,193
Employee Stock Ownership Plan (ESOP), Deferred Shares, Fair Value $ 4,034 $ 2,160