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Fair Value - Fair Value Measurement (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assumed Gain/(Loss) From Loan Sale     $ 3,505    
Interest Rate Movement Effect     6,370    
Servicing Rights Value     4,765    
Security Price Change     (4,232)    
Total Fair Value Measurement Gain/(Loss)     10,408   $ 14,111
Mortgage Banking [Member] | Level 2 [Member] | Not Designated as Hedging Instrument [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value adjustment income (expense) $ 7,018 $ 2,644 (3,703) $ 11,553  
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Rate Lock Commitments [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 736,509   736,509    
Assumed Gain/(Loss) From Loan Sale     1,989    
Interest Rate Movement Effect     3,746    
Servicing Rights Value     3,159    
Total Fair Value Measurement Gain/(Loss)     8,894    
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Forward Sales Contracts [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability 896,225   896,225    
Security Price Change     (4,232)    
Total Fair Value Measurement Gain/(Loss)     (4,232)    
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Mortgages Held for Sale [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assumed Gain/(Loss) From Loan Sale     1,516    
Interest Rate Movement Effect     2,624    
Servicing Rights Value     1,606    
Fair Value, Option, Changes in Fair Value, Gain (Loss)     5,746   7,019
Fair Value, Principal Amount, Loans Held for Sale 319,462   319,462   485,106
Home Building [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior notes 1,193,962   1,193,962   598,301
Senior notes 1,193,962   1,193,962   598,301
Home Building [Member] | Senior Notes Due Two Thousand Thirty [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior notes 595,350   595,350   0
Senior notes 595,350   595,350   0
Home Building [Member] | Senior Notes [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior notes 1,193,962   1,193,962   598,301
Senior notes 1,193,962   1,193,962   598,301
Home Building [Member] | Senior Notes due 2022 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior notes 598,612   598,612   598,301
Senior notes 598,612   598,612   598,301
Home Building [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Senior Notes Due Two Thousand Thirty [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes fair value 623,070   623,070   0
Senior Notes fair value 623,070   623,070   0
Home Building [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Senior Notes [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes fair value 1,260,570   1,260,570   626,520
Senior Notes fair value 1,260,570   1,260,570   626,520
Home Building [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Senior Notes due 2022 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes fair value 637,500   637,500   626,520
Senior Notes fair value $ 637,500   $ 637,500   $ 626,520