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Securities Available-For-Sale (Comparative Summary Of Mortgage-Backed Securities And Other Securities Available-For-Sale) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 945,934 $ 1,244,777
Gross unrealized gains 10,464 31,048
Gross unrealized losses 19,313 194
Estimated fair value 937,085 1,275,631
Pass-through Certificates [Member] | GSE [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 366,884 456,441
Gross unrealized gains 8,573 22,996
Gross unrealized losses 5,113 99
Estimated fair value 370,344 479,338
Real Estate Mortgage Investments Conduits (REMICs) [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 868,933 1,158,071
Gross unrealized gains 10,398 30,354
Gross unrealized losses 19,208 194
Estimated fair value 860,123 1,188,231
Real Estate Mortgage Investments Conduits (REMICs) [Member] | GSE [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 497,575 694,087
Gross unrealized gains 1,699 7,092
Gross unrealized losses 14,047 62
Estimated fair value 485,227 701,117
Real Estate Mortgage Investments Conduits (REMICs) [Member] | Non-GSE [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 4,474 7,543
Gross unrealized gains 126 266
Gross unrealized losses 48 33
Estimated fair value 4,552 7,776
Other Available For Sale Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 77,001 86,706
Gross unrealized gains 66 694
Gross unrealized losses 105  
Estimated fair value 76,962 87,400
Other Available For Sale Securities [Member] | Equity Investments-Mutual Funds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 510 12,998
Estimated fair value 510 12,998
Other Available For Sale Securities [Member] | Corporate Bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 76,491 73,708
Gross unrealized gains 66 694
Gross unrealized losses 105  
Estimated fair value $ 76,452 $ 74,402