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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, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Gains (Loss) on Sales of Securities [Abstract}            
Net gain (loss) realized on sales and calls of AFS securities $ (2)   $ 48 $ (288) $ 58  
Realized pre-tax gain on sales and calls of AFS securities     150 284 179  
Realized pre-tax loss on sales and calls of AFS securities 2   $ 102 572 $ 121  
Securities pledged as collateral to secure public deposit and for other purposes 235,900     235,900   $ 225,700
Amortized cost of securities sold under agreements to repurchase $ 297,000     $ 297,000   $ 296,400
CRA Investments Funds [Member]            
Gains (Loss) on Sales of Securities [Abstract}            
Net gain (loss) realized on sales and calls of AFS securities   $ (436)