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Securities, Gains (Loss) on Sales of Securities, Securities Pledged, and Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Securities [Abstract]          
Net gains realized on sales and calls of AFS securities $ 48 $ 458 $ 58 $ 522  
Realized pre-tax gain on sales and calls of AFS securities 150 460 179 529  
Realized pre-tax loss on sales and calls of AFS securities 102 $ 2 121 $ 7  
Securities pledged as collateral to secure public deposit and for other purposes 222,000   222,000   $ 221,200
Amortized cost of securities sold under agreements to repurchase $ 269,400   $ 269,400   $ 303,500