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Allowance for Credit Losses - Narratives (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Receivables [Abstract]      
Interest income on impaired loans and leases $ 0 $ 0  
Average recorded investment in impaired loans 18,200,000 $ 17,900,000  
Total TDRs $ 2,400,000   $ 345,000