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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]            
Customer deposits   $ 342,376   $ 342,376   $ 250,779
Gain (loss) on land sale gains, net   28,900        
contract asset insurance renewals $ 27,700 30,400   30,400    
Residential mortgage loans available-for-sale fair value   349,784   349,784   570,600
Residential mortgage loans available-for-sale aggregate outstanding principal balance   341,800   341,800   553,500
Changes in fair value, gain (loss)   (700) $ 700 (1,000) $ (3,400)  
Net gains from the sale of mortgages   27,800 $ 27,100 $ 83,900 80,100  
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   434,900   434,900   210,900
Forward contracts            
Finite-Lived Intangible Assets [Line Items]            
Derivative, notional amount   579,000   579,000   522,000
Whole loan commitments            
Finite-Lived Intangible Assets [Line Items]            
Derivative, notional amount   $ 171,400   $ 171,400   $ 203,100
Retained Earnings            
Finite-Lived Intangible Assets [Line Items]            
Cumulative effect of accounting change (see Note 1) $ 22,411       $ 18,643