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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Cumulative Earnings
Cumulative Distributions to Stockholders
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect adjustment - adoption of ASU 2014-13 [1] $ 9,728       $ 9,728  
Balance at beginning of period (Previously Reported) at Dec. 31, 2014 1,256,141 $ 834 $ 1,774,030 $ 140,688 906,867 $ (1,566,278)
Balance at beginning of period at Dec. 31, 2014 1,265,869 $ 834 1,774,030 140,688 916,595 (1,566,278)
Beginning balance (in shares) (Previously Reported) at Dec. 31, 2014   83,443,141        
Beginning balance (in shares) at Dec. 31, 2014   83,443,141        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 102,088       102,088  
Other comprehensive income (loss) (48,695)     (48,695)    
Dividend reinvestment & stock purchase plans 6,834 $ 4 6,830      
Dividend reinvestment & stock purchase plans (in shares)   418,508        
Employee stock purchase and incentive plans (7,981) $ 7 (7,988)      
Employee stock purchase and incentive plans (in shares)   753,429        
Non-cash equity award compensation 11,806   11,806      
Share repurchases (88,785) $ (63) (88,722)      
Share repurchases (in shares)   (6,452,313)        
Common dividends declared (94,871)         (94,871)
Balance at End of Period at Dec. 31, 2015 1,146,265 $ 782 1,695,956 91,993 1,018,683 (1,661,149)
Ending balance (in shares) at Dec. 31, 2015   78,162,765        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 131,252       131,252  
Other comprehensive income (loss) (20,140)     (20,140)    
Employee stock purchase and incentive plans (7,025) $ 5 (7,030)      
Employee stock purchase and incentive plans (in shares)   614,952        
Non-cash equity award compensation 12,648   12,648      
Share repurchases (25,107) $ (19) (25,088)      
Share repurchases (in shares)   (1,943,054)        
Common dividends declared (88,465)         (88,465)
Balance at End of Period at Dec. 31, 2016 1,149,428 $ 768 1,676,486 71,853 1,149,935 (1,749,614)
Ending balance (in shares) at Dec. 31, 2016   76,834,663        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 140,406       140,406  
Other comprehensive income (loss) 13,395     13,395    
Employee stock purchase and incentive plans (3,834) $ 4 (3,838)      
Employee stock purchase and incentive plans (in shares)   375,651        
Non-cash equity award compensation 10,378   10,378      
Share repurchases (9,187) $ (6) (9,181)      
Share repurchases (in shares)   (610,342)        
Common dividends declared (88,299)         (88,299)
Balance at End of Period at Dec. 31, 2017 $ 1,212,287 $ 766 $ 1,673,845 $ 85,248 $ 1,290,341 $ (1,837,913)
Ending balance (in shares) at Dec. 31, 2017   76,599,972        
[1] Upon the adoption of ASU 2014-13 on January 1, 2015, we reclassified all residential loans held at amortized cost to fair value and eliminated our allowance for loan losses for residential loans.