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Other Real Estate and Repossessed Assets Acquired in Settlement of Loans (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of real estate acquired in settlement of loans      
Balance at beginning of period $ 17,291 $ 19,225  
Additions 374 2,233  
Proceeds from sales (1,115) (4,057) $ (1,836)
Charge-offs against the valuation allowance for other real estate owned, net (192) (317)  
Net gain on sales 45 207  
Total other real estate owned and repossessed assets 16,403 17,291 $ 19,225
Less valuation allowance for other real estate owned (3,221)    
Balance at end of period $ 13,182 $ 14,162