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Investment Securities - Schedule of Investment Securities (Details) (USD $)
0 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale and Trading Securities [Line Items]    
Derivative, Notional Amount $ 6,592,077,000 $ 6,815,268,000
Investment Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 2,491,276,000 2,495,006,000
Debt Instrument, Unamortized Discount (Premium), Net 11,968,000 9,118,000
Available-for-sale Securities, Amortized Cost Basis 2,503,244,000 2,504,124,000
Available-for-sale Securities, Unrealized Gains 16,182,000 18,025,000
Available-for-sale Securities, Unrealized Losses (17,291,000) (23,767,000)
Available-for-sale securities 2,502,135,000 2,498,382,000
Marketable Securities 2,494,947,000 2,499,333,000
Marketable Securities, Amortized Cost 2,506,915,000 2,508,451,000
Marketable Securities, Unrealized Gains 16,182,000 18,025,000
Marketable Securities, Unrealized Losses (19,985,000) (26,847,000)
Marketable Securities 2,503,112,000 2,499,629,000
Floating Interest Rate [Member] | Auction-rate certificates backed by Government guaranteed student loans [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 74,100,000 74,100,000
Available-for-sale Securities, Amortized Cost Basis 74,100,000 74,100,000
Available-for-sale Securities, Unrealized Gains 0 0
Available-for-sale Securities, Unrealized Losses (9,012,000) (10,941,000)
Available-for-sale securities 65,088,000 63,159,000
Floating Interest Rate [Member] | Asset-backed Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 162,905,000 150,519,000
Available-for-sale Securities, Amortized Cost Basis 162,674,000 150,147,000
Available-for-sale Securities, Unrealized Gains 1,070,000 933,000
Available-for-sale Securities, Unrealized Losses (48,000) (36,000)
Available-for-sale securities 163,696,000 151,044,000
Trading, at fair value 3,671,000 4,327,000
Trading Securities Amortized Cost 3,671,000 4,327,000
Trading Securities, Unrealized Gains 0 0
Trading Securities, Unrealized Losses (2,694,000) (3,080,000)
Trading securities 977,000 1,247,000
Floating Interest Rate [Member] | Corporate Debt Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 114,345,000 76,345,000
Available-for-sale Securities, Amortized Cost Basis 114,338,000 76,313,000
Available-for-sale Securities, Unrealized Gains 477,000 450,000
Available-for-sale Securities, Unrealized Losses (42,000) 0
Available-for-sale securities 114,773,000 76,763,000
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 742,471,000 699,062,000
Available-for-sale Securities, Amortized Cost Basis 747,419,000 705,035,000
Available-for-sale Securities, Unrealized Gains 5,808,000 8,035,000
Available-for-sale Securities, Unrealized Losses (1,520,000) (211,000)
Available-for-sale securities 751,707,000 712,859,000
Floating Interest Rate [Member] | GSE Subordinated Debt [Member}
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 70,000,000 70,000,000
Available-for-sale Securities, Amortized Cost Basis 70,000,000 70,000,000
Available-for-sale Securities, Unrealized Gains 0 0
Available-for-sale Securities, Unrealized Losses (6,615,000) (12,569,000)
Available-for-sale securities 63,385,000 57,431,000
Floating Interest Rate [Member] | Senior Agency Debt Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 25,000,000 50,000,000
Available-for-sale Securities, Amortized Cost Basis 25,000,000 49,994,000
Available-for-sale Securities, Unrealized Gains 11,000 61,000
Available-for-sale Securities, Unrealized Losses 0 0
Available-for-sale securities 25,011,000 50,055,000
Fixed Interest Rate [Member] | Asset-backed Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value   6,501,000
Available-for-sale Securities, Amortized Cost Basis   6,501,000
Available-for-sale Securities, Unrealized Gains   0
Available-for-sale Securities, Unrealized Losses   0
Available-for-sale securities   6,501,000
Fixed Interest Rate [Member] | Corporate Debt Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 65,000,000 51,969,000
Available-for-sale Securities, Amortized Cost Basis 65,106,000 52,212,000
Available-for-sale Securities, Unrealized Gains 122,000 204,000
Available-for-sale Securities, Unrealized Losses (40,000) 0
Available-for-sale securities 65,188,000 52,416,000
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 1,320,000 1,910,000
Available-for-sale Securities, Amortized Cost Basis 5,391,000 1,911,000
Available-for-sale Securities, Unrealized Gains 3,750,000 154,000
Available-for-sale Securities, Unrealized Losses 0 0
Available-for-sale securities 9,141,000 [1] 2,065,000
Derivative, Notional Amount 152,400,000  
Fixed Interest Rate [Member] | GSE Preferred Stock [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 78,500,000 78,500,000
Available-for-sale Securities, Amortized Cost Basis 78,973,000 79,284,000
Available-for-sale Securities, Unrealized Gains 4,482,000 7,802,000
Available-for-sale Securities, Unrealized Losses 0 0
Available-for-sale securities 83,455,000 87,086,000
Fixed Interest Rate [Member] | Taxable Municipal Bonds [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 26,635,000  
Available-for-sale Securities, Amortized Cost Basis 26,752,000  
Available-for-sale Securities, Unrealized Gains 2,000  
Available-for-sale Securities, Unrealized Losses (10,000)  
Available-for-sale securities 26,744,000  
Fixed Interest Rate [Member] | Senior Agency Debt Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 326,000,000 72,700,000
Available-for-sale Securities, Amortized Cost Basis 326,617,000 72,987,000
Available-for-sale Securities, Unrealized Gains 153,000 128,000
Available-for-sale Securities, Unrealized Losses (3,000) (1,000)
Available-for-sale securities 326,767,000 73,114,000
Fixed Interest Rate [Member] | US Treasury Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 805,000,000 1,163,400,000
Available-for-sale Securities, Amortized Cost Basis 806,874,000 1,165,640,000
Available-for-sale Securities, Unrealized Gains 307,000 258,000
Available-for-sale Securities, Unrealized Losses (1,000) (9,000)
Available-for-sale securities 807,180,000 1,165,889,000
Investment Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Available-for-sale, at fair value 2,502,135,000 2,498,382,000
Trading, at fair value 977,000 1,247,000
Marketable Securities 2,503,112,000 2,499,629,000
Available-for-sale Securities [Member] | Investment Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 11,968,000 9,118,000
Available-for-sale Securities [Member] | Floating Interest Rate [Member] | Auction-rate certificates backed by Government guaranteed student loans [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 0 0
Available-for-sale Securities [Member] | Floating Interest Rate [Member] | Asset-backed Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net (231,000) (372,000)
Available-for-sale Securities [Member] | Floating Interest Rate [Member] | Corporate Debt Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net (7,000) (32,000)
Available-for-sale Securities [Member] | Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 4,948,000 5,973,000
Available-for-sale Securities [Member] | Floating Interest Rate [Member] | GSE Subordinated Debt [Member}
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 0 0
Available-for-sale Securities [Member] | Floating Interest Rate [Member] | Senior Agency Debt Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 0 (6,000)
Available-for-sale Securities [Member] | Fixed Interest Rate [Member] | Asset-backed Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net   0
Available-for-sale Securities [Member] | Fixed Interest Rate [Member] | Corporate Debt Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 106,000 243,000
Available-for-sale Securities [Member] | Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 4,071,000 1,000
Available-for-sale Securities [Member] | Fixed Interest Rate [Member] | Interest-Only-Strip [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 7,700,000  
Available-for-sale Securities [Member] | Fixed Interest Rate [Member] | GSE Preferred Stock [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 473,000 784,000
Available-for-sale Securities [Member] | Fixed Interest Rate [Member] | Taxable Municipal Bonds [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 117,000  
Available-for-sale Securities [Member] | Fixed Interest Rate [Member] | Senior Agency Debt Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 617,000 287,000
Available-for-sale Securities [Member] | Fixed Interest Rate [Member] | US Treasury Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net 1,874,000 2,240,000
Trading Account Assets [Member] | Floating Interest Rate [Member] | Asset-backed Securities [Member]
   
Schedule of Available-for-sale and Trading Securities [Line Items]    
Debt Instrument, Unamortized Discount (Premium), Net $ 0 $ 0
[1] Fair value includes $7.7 million of an interest-only security with a notional amount of $152.4 million.