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Fair Value of Financial Instruments (Assets Measured at Fair Value Nonrecurring) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Nonrecurring Basis          
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities       $ 0  
Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs $ 0 $ 0 $ 182,000    
Nonrecurring Basis | Level 3          
Nonrecurring Basis          
Other Real Estate, Foreclosed Assets, and Repossessed Assets $ 293,000     $ 293,000 $ 227,000