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Securities (Narrative) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
security
$ / shares
shares
Dec. 31, 2020
USD ($)
security
Debt and Equity Securities, FV-NI [Line Items]      
Private mortgage-backed security fair value   $ 900,000 $ 1,000,000.0
Number of securities held in an unrealized loss position | security   155 69
Impairment charges on available for sale securities $ 0    
Impairment charges on held to maturity securities $ 0    
Investment securities, pledged as collateral for public deposits   $ 812,763,000 $ 630,303,000
FHLB stock and FRB stock, cost   21,690,000 23,526,000
FHLB, cost   3,970,000 5,855,000
FRB stock   $ 17,720,000 $ 17,671,000
Visa, Inc | Common Class B      
Debt and Equity Securities, FV-NI [Line Items]      
Stock owned (in shares) | shares   12,356  
Investment without readily determinable fair value   $ 0  
Visa, Inc | Common Class A      
Debt and Equity Securities, FV-NI [Line Items]      
Conversion price (in dollars per share) | $ / shares   $ 1.62  
Conversion of stock (in shares) | shares   20,051