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Loans and Allowance - Allowance for Credit Losses, Off-balance Sheet (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]  
Balances, December 31, 2020 $ 0
Provision for credit losses 0
Balances, March 31, 2021 20,500
Cumulative effect of ASC 326 adoption  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]  
Balances, December 31, 2020 20,500
Balances, March 31, 2021 $ 20,500