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Other Real Estate and Repossessed Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Summary of real estate and other assets acquired in settlement of loans            
Repossessed assets $ 0   $ 16      
Total 16,379 $ 16,530 17,291 $ 17,698 $ 18,462 $ 19,225
Less valuation allowance for other real estate owned (3,202) $ (3,174) (3,129) (3,260) $ (3,208) $ (3,233)
Total other real estate and repossessed assets 13,177   14,162 $ 14,438    
Commercial            
Summary of real estate and other assets acquired in settlement of loans            
Real estate acquired through foreclosure 727   809      
Commercial real estate | Construction            
Summary of real estate and other assets acquired in settlement of loans            
Real estate acquired through foreclosure 12,380   12,380      
Commercial real estate | Mortgage            
Summary of real estate and other assets acquired in settlement of loans            
Real estate acquired through foreclosure 2,909   3,439      
Residential real estate | Mortgage            
Summary of real estate and other assets acquired in settlement of loans            
Real estate acquired through foreclosure $ 363   $ 647