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Fair Value - Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis (Details) - Collateral-dependent loans - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Assets with fair value adjustments on a nonrecurring basis          
Total impairment losses $ 0 $ 0 $ 400,000 $ 0  
Fair Value Measurements, Nonrecurring | Level 3          
Assets with fair value adjustments on a nonrecurring basis          
Fair value $ 1,840,000   $ 1,840,000   $ 1,502,000