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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Cumulative effect of accounting change (see Note 1) $ 22,411 $ 18,237  
Residential mortgage loans available-for-sale fair value 385,453   $ 570,600
Residential mortgage loans available-for-sale aggregate outstanding principal balance 374,400   553,500
Net gain (loss) from change in fair value (100) (2,000)  
Net gains from the sale of mortgages $ 27,000 25,300  
Variability in future cash flows of derivative instruments in days 60 days    
Interest rate lock commitments      
Finite-Lived Intangible Assets [Line Items]      
Derivative, notional amount $ 375,300   210,900
Forward contracts      
Finite-Lived Intangible Assets [Line Items]      
Derivative, notional amount 539,000   522,000
Whole loan commitments      
Finite-Lived Intangible Assets [Line Items]      
Derivative, notional amount 186,100   $ 203,100
Retained Earnings      
Finite-Lived Intangible Assets [Line Items]      
Cumulative effect of accounting change (see Note 1) $ 22,411 $ 18,643