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Goodwill and Intangible Assets Amortization Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Total Amortization Expense [Abstract]          
Amortization of intangible assets $ 716 $ 559 $ 1,221 $ 1,106  
Estimated Amortization Expense [Abstract]          
For period 07/01/18-12/31/18 1,556   1,556    
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 591 472 1,011 943  
Customer Lists [Member]          
Total Amortization Expense [Abstract]          
Amortization of intangible assets 45 45 91 91  
Mortgage Servicing Rights [Member]          
Total Amortization Expense [Abstract]          
Amortization of intangible assets $ 80 $ 42 $ 119 $ 72 $ 141