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Goodwill and Intangible Assets Amortization Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Total Amortization Expense [Abstract]      
Amortization of intangible assets $ 547 $ 455  
Estimated Amortization Expense [Abstract]      
For period 04/01/17-12/31/17 1,585    
For year ended 12/31/18 1,934    
For year ended 12/31/19 1,758    
For year ended 12/31/20 1,556    
For year ended 12/31/21 1,284    
For year ended 12/31/22 1,175    
Core Deposits [Member]      
Total Amortization Expense [Abstract]      
Amortization of intangible assets 471 409  
Customer Lists [Member]      
Total Amortization Expense [Abstract]      
Amortization of intangible assets 46 46  
Mortgage Servicing Rights [Member]      
Total Amortization Expense [Abstract]      
Amortization of intangible assets $ 30 $ 0 $ 98