Quarterly report pursuant to Section 13 or 15(d)

Warehouse Lines of Credit - Summary of Warehouse Lines of Credit (Details)

v3.21.1
Warehouse Lines of Credit - Summary of Warehouse Lines of Credit (Details) - Warehouse Agreement Borrowings - Line of Credit - USD ($)
 1 Months Ended 3 Months Ended
Feb. 28, 2021
Mar. 31, 2021
Dec. 31, 2020
Warehouse Lines of Credit [Line Items]      
Warehouse lines of credit   $ 2,073,481,000 $ 2,145,584,000
Prepaid commitment fees   (2,148,000) (2,141,000)
Total   2,071,333,000 2,143,443,000
$800 Million Master Repurchase Facility Agreement Due January 2022      
Warehouse Lines of Credit [Line Items]      
Borrowing capacity   800,000,000  
Warehouse lines of credit   $ 353,809,000 442,593,000
Line of credit, floor interest rate   0.75%  
$250 Million Master Repurchase Facility Agreement Due September 2021      
Warehouse Lines of Credit [Line Items]      
Borrowing capacity   $ 250,000,000  
Warehouse lines of credit   169,473,000 148,011,000
Minimum deposit required for line of credit   1,250,000  
$500 Million Master Repurchase Facility Agreement Due February 2022      
Warehouse Lines of Credit [Line Items]      
Borrowing capacity $ 500,000,000.0 500,000,000  
Warehouse lines of credit   424,687,000 541,074,000
Minimum deposit required for line of credit $ 2,500,000    
$200 Million Master Repurchase Facility Agreement Due May 2021      
Warehouse Lines of Credit [Line Items]      
Borrowing capacity   200,000,000  
Warehouse lines of credit   171,491,000 187,214,000
Minimum deposit required for line of credit   $ 750,000  
$200 Million Master Repurchase Facility Agreement Due May 2021 | LIBOR      
Warehouse Lines of Credit [Line Items]      
Line of credit, floor interest rate   1.525%  
$300 Million Master Repurchase Facility Agreement Due September 2021      
Warehouse Lines of Credit [Line Items]      
Borrowing capacity   $ 300,000,000  
Warehouse lines of credit   $ 223,600,000 232,272,000
$300 Million Master Repurchase Facility Agreement Due September 2021 | LIBOR      
Warehouse Lines of Credit [Line Items]      
Line of credit, floor interest rate   0.40%  
$500 Million Master Repurchase Facility Agreement Due July 2021      
Warehouse Lines of Credit [Line Items]      
Borrowing capacity   $ 500,000,000  
Warehouse lines of credit   $ 417,250,000 464,355,000
$500 Million Master Repurchase Facility Agreement Due July 2021 | LIBOR      
Warehouse Lines of Credit [Line Items]      
Line of credit, floor interest rate   0.75%  
$200 Million Master Repurchase Facility Agreement Due April 2021      
Warehouse Lines of Credit [Line Items]      
Borrowing capacity   $ 200,000,000  
Warehouse lines of credit   $ 136,116,000 104,880,000
Line of credit, floor interest rate   1.75%  
$250 Million Master Repurchase Facility Agreement Due 30 Days From Written Notice      
Warehouse Lines of Credit [Line Items]      
Borrowing capacity   $ 250,000,000  
Warehouse lines of credit   $ 154,616,000 0
Maturity, period from written notice   30 days  
$75 Million Master Repurchase Facility Agreement Due March 2024      
Warehouse Lines of Credit [Line Items]      
Borrowing capacity   $ 75,000,000  
Warehouse lines of credit   $ 22,439,000 $ 25,185,000
Stated interest rate   3.375%  
Maximum term of buyout transactions on facility   4 years