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Securities, Gains (Loss) on Sales of Securities, Securities Pledged, and Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2008
Gains (Loss) on Sales of Securities [Abstract}        
Net securities gain (loss) $ 783 $ (85) $ 73  
Net gain (loss) realized on sales and calls of AFS securities 3 (85) 73  
Realized pre-tax gain on sales and calls of AFS securities 80      
Realized pre-tax loss on sales and calls of AFS securities 77      
Unrealized gain from fair market value adjustment of equity securities 780 (0) $ (0)  
Equity securities at fair value 1,953 1,173    
Securities Pledged as Collateral [Abstract]        
Securities pledged as collateral to secure public deposit and for other purposes 239,100 258,800    
Securities Sold under Agreements to Repurchase [Abstract]        
Amortized cost of securities sold under agreements to repurchase 261,500 289,100    
Visa Class B Restricted Stock [Member]        
Gains (Loss) on Sales of Securities [Abstract}        
Gain on recognition of fair value of equity securities   $ 1,200    
Number of shares of stock acquired (in shares)       9,918
Equity securities at fair value $ 2,000      
Number of shares held in portfolio (in shares)   9,918