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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Total Amortization Expense [Abstract]          
Amortization of intangible assets $ 838 $ 545 $ 2,059 $ 1,651  
Estimated Amortization Expense [Abstract]          
For period 07/01/18-12/31/18 718   718    
For year ended 12/31/19 2,903   2,903    
For year ended 12/31/20 2,409   2,409    
For year ended 12/31/21 1,943   1,943    
For year ended 12/31/22 1,730   1,730    
For year ended 12/31/23 1,547   1,547    
Core Deposits [Member]          
Total Amortization Expense [Abstract]          
Amortization of intangible assets 669 466 1,680 1,409  
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 $ 123 $ 33 $ 242 $ 105 $ 141