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Goodwill and Intangible Assets Mortgage Servicing Rights (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 08, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]          
Amortization of Intangible Assets   $ (547,000) $ (455,000)    
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   (30,000) $ 0 (98,000)  
Finite-Lived Intangible Assets, Net   $ 955,000   $ 985,000 $ 0