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Goodwill and Intangible Assets Mortgage Servicing Rights (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 08, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]              
Amortization of Intangible Assets   $ (559,000) $ (402,000) $ (1,106,000) $ (857,000)    
Mortgage Servicing Rights [Member]              
Finite-Lived Intangible Assets [Line Items]              
Finite-lived Intangible Assets Acquired $ 1,069,000     0   $ 1,069,000  
Capitalization Of Mortgage Servicing Rights       0   14,000  
Amortization of Intangible Assets   (42,000) $ 0 (72,000) $ 0 (98,000)  
Finite-Lived Intangible Assets, Net   $ 913,000   $ 913,000   $ 985,000 $ 0