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Fair Value - Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis (Details) - Collateral-dependent loans - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Assets with fair value adjustments on a nonrecurring basis      
Total impairment losses $ 0 $ 400  
Fair Value Measurements, Nonrecurring | Level 3      
Assets with fair value adjustments on a nonrecurring basis      
Fair value     $ 1,840