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Securities Available-For-Sale (Gross Unrealized Losses On Mortgage-Backed Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months $ 18,138 $ 157
Estimated Fair value, less than 12 months 479,747 114,466
Unrealized losses, 12 months or more 1,175 37
Estimated Fair value, 12 months or more 49,530 8,237
Unrealized losses, total 19,313 194
Estimated fair value, total 529,277 122,703
Pass-through Certificates [Member] | GSE [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months 5,087 99
Estimated Fair value, less than 12 months 150,473 14,156
Unrealized losses, 12 months or more 26  
Estimated Fair value, 12 months or more 4,482  
Unrealized losses, total 5,113 99
Estimated fair value, total 154,955 14,156
Real Estate Mortgage Investments Conduits (REMICs) [Member] | GSE [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months 12,923 58
Estimated Fair value, less than 12 months 283,419 100,310
Unrealized losses, 12 months or more 1,124 4
Estimated Fair value, 12 months or more 44,606 7,633
Unrealized losses, total 14,047 62
Estimated fair value, total 328,025 107,943
Real Estate Mortgage Investments Conduits (REMICs) [Member] | Non-GSE [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months 23  
Estimated Fair value, less than 12 months 1,092  
Unrealized losses, 12 months or more 25 33
Estimated Fair value, 12 months or more 442 604
Unrealized losses, total 48 33
Estimated fair value, total 1,534 604
Other Available For Sale Securities [Member] | Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months 105  
Estimated Fair value, less than 12 months 44,763  
Unrealized losses, total 105  
Estimated fair value, total $ 44,763