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Loans Held for Investment and Allowance for Loan Losses - Restructured Loans (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Dec. 31, 2019
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Nonaccrual loans that met the criteria for restructured $ 47,700   $ 35,100
Number of Contracts | loan 8 2  
Loans modified as restructured loans $ 41,737 $ 5,765  
Temporary Modification      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Aggregate number of loans modified | loan 483    
Financing Receivable, Modifications, Outstanding Balance $ 1,300,000    
Aggregate interest deferred $ 10,700    
Continuing Modification      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Aggregate number of loans modified | loan 73    
Financing Receivable, Modifications, Outstanding Balance $ 166,200    
Second Modification      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Modifications, Outstanding Balance $ 61,200    
Extended maturity      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Contracts | loan 3 2  
Loans modified as restructured loans $ 13,605 $ 5,765  
Adjusted payment schedule      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Contracts | loan 5 0  
Loans modified as restructured loans $ 28,132 $ 0  
Commercial Loan | Business Loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Contracts | loan 4 1  
Loans modified as restructured loans $ 22,299 $ 1,824  
Commercial Loan | Business Loans | Extended maturity      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Contracts | loan 2 1  
Loans modified as restructured loans $ 7,636 $ 1,824  
Commercial Loan | Business Loans | Adjusted payment schedule      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Contracts | loan 2 0  
Loans modified as restructured loans $ 14,663 $ 0  
Commercial Loan | Energy      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Contracts | loan 4 1  
Loans modified as restructured loans $ 19,438 $ 3,941  
Commercial Loan | Energy | Extended maturity      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Contracts | loan 1 1  
Loans modified as restructured loans $ 5,969 $ 3,941  
Commercial Loan | Energy | Adjusted payment schedule      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of Contracts | loan 3 0  
Loans modified as restructured loans $ 13,469 $ 0