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Loans - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Reclassification of loans held for investment to loans held for sale $ 301,600   $ 301,551 $ 0  
Loans held for sale, at lower of cost or fair value 301,551   301,551   $ 0
Provision for/(release of) losses 366 $ 653 518 4,542  
Rural Utilities          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for/(release of) losses (120) 1,182 701 4,704  
Farm & Ranch          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for/(release of) losses $ 414 (300) $ (239) (412)  
Rural Utilities and Farm & Ranch          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for/(release of) losses   $ 900   $ 4,300