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Investments (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Schedule of Investments [Line Items]            
Federal Home Loan Bank Stock and Federal Reserve Bank Stock   $ 15,300,000   $ 15,300,000   $ 15,500,000
Certificates of deposit, at carrying value   1,000,000   1,000,000   2,000,000
Non-governmental issues exceeding 10% shareholders equity threshold   0   0   0
Credit-related investment impairment losses       0 $ 0  
Sale of VISA shares   0 $ 0 0 $ 17,837,000  
Asset Pledged as Collateral            
Schedule of Investments [Line Items]            
Carrying value of securities pledged   691,000,000   691,000,000   644,000,000
Marketable equity securities            
Schedule of Investments [Line Items]            
Investment securities   $ 9,200,000   $ 9,200,000   $ 11,800,000
VISA, Inc. (VISA)            
Schedule of Investments [Line Items]            
Sale of VISA shares $ 17,800,000          
VISA, Inc. (VISA) | Common Class B            
Schedule of Investments [Line Items]            
Shares of Visa Inc. Class B common shares sold (in shares) 86,605          
VISA, Inc. (VISA) | Marketable equity securities            
Schedule of Investments [Line Items]            
Investment securities $ 0          
Maximum | Eagle Financial Services, Inc. (EFSI)            
Schedule of Investments [Line Items]            
Equity ownership positions in the community bank holding companies (percent)   1.50%   1.50%