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Securities (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
security
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
security
Sep. 30, 2019
USD ($)
Dec. 31, 2019
security
Schedule of Available-for-sale Securities [Line Items]          
Other-than-temporary impairment $ 0 $ 0 $ 0 $ 0  
Sales of securities $ 0 $ 0 $ 0 $ 0  
U.S. Government-Sponsored Entities And Agencies [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Minimum percentage of securities held 10.00%   10.00%   10.00%
Number of holdings | security 0   0   0