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Loans and Allowance for Loan Losses - Pledged (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Loans and Allowance for Loan Losses    
Total loans $ 1,800,386 $ 1,979,375
Pledged    
Loans and Allowance for Loan Losses    
Total loans $ 1,200,000 $ 1,200,000