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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]            
Customer deposits $ 354,968   $ 354,968     $ 250,779
Gain (loss) on land sale gains, net 27,300          
contract asset insurance renewals 29,800   29,800   $ 27,700  
Residential mortgage loans available-for-sale fair value 369,634   369,634     570,600
Residential mortgage loans available-for-sale aggregate outstanding principal balance 359,200   359,200     553,500
Changes in fair value, gain (loss) (200) $ (2,200) (300) $ (4,100)    
Net gains from the sale of mortgages 29,200 $ 27,700 $ 56,200 52,900    
Variability in future cash flows of derivative instruments in days     60 days      
Cumulative effect of accounting change (see Note 1)     $ 22,411 18,237    
Interest rate lock commitments            
Finite-Lived Intangible Assets [Line Items]            
Derivative, notional amount 426,500   426,500     210,900
Forward contracts            
Finite-Lived Intangible Assets [Line Items]            
Derivative, notional amount 568,000   568,000     522,000
Whole loan commitments            
Finite-Lived Intangible Assets [Line Items]            
Derivative, notional amount $ 186,700   186,700     $ 203,100
Retained Earnings            
Finite-Lived Intangible Assets [Line Items]            
Cumulative effect of accounting change (see Note 1)     $ 22,411 $ 18,643