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Fair Value Measurements And Fair Values Of Financial Instruments (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Total liabilities $ 0  
Assets, Level 1 to Level 2 Transfers 0  
Liabilities, Level 1 to Level 2 Transfers 0  
Partial charge-offs on impaired loans 0  
Fair Value, Nonrecurring [Member]    
Assets, Fair Value Disclosure $ 0 $ 1,080,000