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Loans and Allowance for Credit Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 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 689,000 $ 910,000 2,100,000 $ 2,100,000  
Currently performing impaired loans $ 26,000,000   $ 26,000,000   $ 51,700,000