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Investment Securities (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
security
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
security
Sep. 30, 2019
USD ($)
Investment Securities [Abstract]          
Proceeds from sale and maturity of marketable securities | $ $ 0   $ 0 $ 13,000,000.0 $ 0
Gain on sale of investments | $   $ 347,000      
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security 12     12  
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security 2     2