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Loans Held for Investment and Allowance for Loan Losses - Age Analysis (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]      
Total Past Due $ 39,754,000    
Non-accrual 97,730,000    
Current 24,343,217,000    
Total 24,480,701,000   $ 24,501,830,000
Non-accrual With No Allowance 43,762,000    
Premium finance loans past due and still accruing 3,100,000    
Nonaccrual, interest income 0 $ 0  
Interest income reversed 339,000    
30 to 59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due 30,662,000    
60 to 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due 2,905,000    
Greater Than 90 Days      
Financing Receivable, Past Due [Line Items]      
Total Past Due 6,187,000    
Commercial      
Financing Receivable, Past Due [Line Items]      
Total Past Due 22,353,000    
Non-accrual 38,194,000    
Current 8,908,677,000    
Total 8,969,224,000   8,861,580,000
Non-accrual With No Allowance 15,860,000    
Commercial | 30 to 59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due 15,563,000    
Commercial | 60 to 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due 2,905,000    
Commercial | Greater Than 90 Days      
Financing Receivable, Past Due [Line Items]      
Total Past Due 3,885,000    
Energy      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Non-accrual 29,368,000    
Current 662,438,000    
Total 691,806,000   766,217,000
Non-accrual With No Allowance 18,189,000    
Energy | 30 to 59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Energy | 60 to 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Energy | Greater Than 90 Days      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Mortgage finance      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Non-accrual 0    
Current 9,009,081,000    
Total 9,009,081,000   9,079,409,000
Non-accrual With No Allowance 0    
Mortgage finance | 30 to 59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Mortgage finance | 60 to 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Mortgage finance | Greater Than 90 Days      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Real estate      
Financing Receivable, Past Due [Line Items]      
Total 5,810,590,000   $ 5,794,624,000
Real estate | Commercial Real Estate      
Financing Receivable, Past Due [Line Items]      
Total Past Due 17,177,000    
Non-accrual 6,696,000    
Current 3,665,119,000    
Total 3,688,992,000    
Non-accrual With No Allowance 1,849,000    
Real estate | Residential Homebuilder Finance      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Non-accrual 0    
Current 895,680,000    
Total 895,680,000    
Non-accrual With No Allowance 0    
Real estate | Other Financing Receivable      
Financing Receivable, Past Due [Line Items]      
Total Past Due 105,000    
Non-accrual 23,254,000    
Current 867,524,000    
Total 890,883,000    
Non-accrual With No Allowance 7,864,000    
Real estate | Secured by 1-4 family      
Financing Receivable, Past Due [Line Items]      
Total Past Due 119,000    
Non-accrual 218,000    
Current 334,698,000    
Total 335,035,000    
Non-accrual With No Allowance 0    
Real estate | 30 to 59 Days Past Due | Commercial Real Estate      
Financing Receivable, Past Due [Line Items]      
Total Past Due 14,939,000    
Real estate | 30 to 59 Days Past Due | Residential Homebuilder Finance      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Real estate | 30 to 59 Days Past Due | Other Financing Receivable      
Financing Receivable, Past Due [Line Items]      
Total Past Due 105,000    
Real estate | 30 to 59 Days Past Due | Secured by 1-4 family      
Financing Receivable, Past Due [Line Items]      
Total Past Due 55,000    
Real estate | 60 to 89 Days Past Due | Commercial Real Estate      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Real estate | 60 to 89 Days Past Due | Residential Homebuilder Finance      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Real estate | 60 to 89 Days Past Due | Other Financing Receivable      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Real estate | 60 to 89 Days Past Due | Secured by 1-4 family      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Real estate | Greater Than 90 Days | Commercial Real Estate      
Financing Receivable, Past Due [Line Items]      
Total Past Due 2,238,000    
Real estate | Greater Than 90 Days | Residential Homebuilder Finance      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Real estate | Greater Than 90 Days | Other Financing Receivable      
Financing Receivable, Past Due [Line Items]      
Total Past Due 0    
Real estate | Greater Than 90 Days | Secured by 1-4 family      
Financing Receivable, Past Due [Line Items]      
Total Past Due $ 64,000