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Fair Value - Fair Value on a Nonrecurring Basis Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Impaired financing receivable, related allowance $ 3,551 $ 4,107
Decrease in valuation allowance for impaired loans (556)  
Letters of Credit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Standby letter of credit $ 4,400 $ 4,500