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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 12 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2008
Gains (Loss) on Sales of Securities [Abstract}            
Net securities loss     $ (85) $ 73 $ 522  
Net gain (loss) realized on sales and calls of AFS securities     (1,300)      
Realized pre-tax gain on sale of securities     300      
Pre-tax loss on sale of securities     1,600      
Securities Pledged as Collateral [Abstract]            
Securities pledged as collateral to secure public deposit and for other purposes $ 258,800   258,800 225,700    
Securities Sold under Agreements to Repurchase [Abstract]            
Amortized cost of securities sold under agreements to repurchase 289,100   289,100 $ 296,400    
CRA Investments Funds [Member]            
Gains (Loss) on Sales of Securities [Abstract}            
Net gain (loss) realized on sales and calls of AFS securities   $ (400)        
Visa Class B Restricted Stock [Member]            
Gains (Loss) on Sales of Securities [Abstract}            
Unrealized gain from equity securities $ 1,200          
Number of shares of stock acquired (in shares)           9,918
Gain on recognition of fair value of equity securities     $ 1,200      
Number of shares held in portfolio (in shares) 9,918   9,918