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Loans and Asset Quality Information (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Indemnification asset expense $ 5,700      
Accretion of loan discount   $ 1,908 $ 4,751  
Acquired performing loans 152,200 152,200    
Sold performing loans 150,600 150,600    
Allowance for loan losses 1,000 1,000    
Special mention loans 29,700 29,700    
Real estate - mortgage - residential (1-4 family) first mortgages [Member]        
Nonaccrual loans in process of foreclosure 1,700 1,700   $ 3,000
Purchased Impaired Loans [Member]        
Accretion of loan discount   780    
Payments that exceeded the initial carrying amount on purchased impaired loans   1,108    
Additional loan interest income   328    
Non-Covered Purchased Nonimpaired Loans [Member]        
Accretion of loan discount   1,645    
Remaining loan discount for non-covered purchased accruing loans $ 12,358 12,358    
Purchased Covered Nonimpaired Loans [Member]        
Accretion of loan discount   $ 1,908