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Securities (Narrative) (Details)
9 Months Ended
Sep. 30, 2020
USD ($)
security
Sep. 30, 2019
USD ($)
Securities [Abstract]    
Debt securities in unrealized loss position in the less than twelve months category | security 8  
Debt securities in unrealized loss position in the twelve months or more category | security 0  
Impairment of investments | $ $ 0  
Pledged Financial Instruments, Not Separately Reported, Securities | $ $ 189,346,000 $ 157,233,000