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Loans and Allowance for Credit Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, Interest Income, Cash Basis Method $ 0 $ 0 $ 0 $ 0  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 776,000 $ 854,000 1,100,000 $ 1,600,000  
Currently performing impaired loans $ 39,500,000   $ 39,500,000   $ 51,700,000