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Securities (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Securities [Abstract]      
Investment securities, pledged as collateral for public deposits $ 183,529   $ 147,009
Proceeds from sales of securities 45,601 $ 8  
Net realized gain loss of investment securities 235 $ 3  
Federal Home Loan Bank stock and Federal Reserve Bank stock, cost 26,353   19,826
Federal Home Loan Bank Stock, cost 16,702   12,588
Federal Reserve Bank, cost $ 9,651   $ 7,238