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Securities, Gains (Loss) on Sales of Securities, Securities Pledged, and Securities Sold Under Agreements to Repurchase (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Security
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Gains (Loss) on Sales of Securities [Abstract}      
Net securities gain (loss) $ 1,769 $ 783 $ (85)
Net gain (loss) realized on sales and calls of AFS securities 1,251 3 (85)
Realized pre-tax gain on sales and calls of AFS securities 1,500    
Realized pre-tax loss on sales and calls of AFS securities 200    
Unrealized gain from fair market value adjustment of equity securities 518 780 $ (0)
Equity securities at fair value 2,471 1,953  
Securities Pledged as Collateral [Abstract]      
Securities pledged as collateral to secure public deposit and for other purposes 354,500 239,100  
Securities Sold under Agreements to Repurchase [Abstract]      
Amortized cost of securities sold under agreements to repurchase 386,600 261,500  
Visa Class B Restricted Stock [Member]      
Gains (Loss) on Sales of Securities [Abstract}      
Equity securities at fair value 2,500    
Increase (Decrease) in fair market value of equity securities $ 500 $ 800  
Number of equity securities sold (in shares) | Security 0