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Goodwill and Intangible Assets Amortization Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Total Amortization Expense [Abstract]          
Amortization of intangible assets $ 545 $ 455 $ 1,651 $ 1,312  
Estimated Amortization Expense [Abstract]          
For period 10/01/17-12/31/17 501   501    
For year ended 12/31/18 1,954   1,954    
For year ended 12/31/19 1,778   1,778    
For year ended 12/31/20 1,576   1,576    
For year ended 12/31/21 1,304   1,304    
For year ended 12/31/22 1,195   1,195    
Core Deposits [Member]          
Total Amortization Expense [Abstract]          
Amortization of intangible assets 466 395 1,409 1,161  
Customer Lists [Member]          
Total Amortization Expense [Abstract]          
Amortization of intangible assets 46 46 137 137  
Mortgage Servicing Rights [Member]          
Total Amortization Expense [Abstract]          
Amortization of intangible assets $ 33 $ 14 $ 105 $ 14 $ 98