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Securities (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Securities [Abstract]      
Private mortgage-backed security fair value   $ 1,100  
Investment securities, pledged as collateral for public deposits   233,437 $ 176,813
Sales of investment securities $ 45,601    
Net realized gains (losses) of investment securities $ 235    
Federal Home Loan Bank stock and Federal Reserve Bank stock, cost   37,437 31,338
Federal Home Loan Bank Stock, cost   20,036 19,647
Federal Reserve Bank, cost   $ 17,401 $ 11,691