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Securities (Narrative) (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
security
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt and Equity Securities, FV-NI [Line Items]      
Private mortgage-backed security fair value $ 1,100,000 $ 1,000,000.0  
Other than temporary impairment losses $ 0 0  
Number of securities in an unrealized loss position | security 54    
Investment securities, pledged as collateral for public deposits $ 260,826,000 234,382,000  
Proceeds from sales of securities available for sale 39,797,000 0 $ 140,621,000
Gains (losses) sales of securities available for sale 97,000 0 $ (235,000)
FHLB stock and FRB stock, cost 33,380,000 37,468,000  
FHLB, cost 15,789,000 20,036,000  
FRB stock $ 17,591,000 $ 17,432,000  
Visa, Inc | Common Class B      
Debt and Equity Securities, FV-NI [Line Items]      
Stock owned (in shares) | shares 12,356    
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