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Loans and Allowance (Categories of Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans $ 1,478,122   $ 1,186,713 $ 1,196,829    
Undisbursed loans in process (11,952)   (13,071)      
Unamortized deferred loan costs, net 8,213   6,503      
Allowance for loan losses (13,009) $ (12,729) (12,387) $ (12,378) $ (12,426) $ (12,382)
Net loans 1,461,374   1,167,758      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 490,150   318,684      
Construction Loans [Member] | Commercial Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 42,854   28,164      
First Mortgage [Member] | Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 470,418   444,243      
Second Mortgage [Member] | Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 76,843   69,477      
Automobile Loan [Member] | Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 33,050   19,640      
Boat/RVs [Member] | Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 212,679   169,238      
Other [Member] | Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 6,703   6,188      
Commercial and Industrial [Member] | Commercial Segment [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 145,425   131,079      
Real estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 1,080,265   860,568      
Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans $ 397,857   $ 326,145