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Investment Securities - Schedule of Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Available-for-sale Securities [Abstract]    
Derivative, Notional Amount $ 8,532,790 $ 8,429,964
Investment Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 2,458,409 2,773,111
Unamortized Premium/(Discount) 5,271 5,936
Available-for-sale Securities, Amortized Cost Basis 2,463,680 2,779,047
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7,966 6,891
Available-for-sale Securities, Unrealized Losses (10,967) (10,913)
Available-for-sale Securities, Fair Value Disclosure 2,460,679 2,775,025
Trading Securities [Abstract]    
Trading, at fair value 281 491
Marketable Securities [Abstract]    
Marketable Securities Unpaid Principal Balance 2,460,296 2,775,322
Marketable Securities, Amortized Cost 2,465,567 2,781,258
Marketable Securities, Unrealized Gains 7,966 6,891
Marketable Securities, Unrealized Losses (12,573) (12,633)
Marketable Securities 2,460,960 2,775,516
Senior Agency Debt [Member]    
Available-for-sale Securities [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 1,967,759 1,888,344
Trading Securities [Abstract]    
Trading, at fair value 24,787 28,975
Marketable Securities [Abstract]    
Marketable Securities 1,992,546 1,917,319
Available-for-sale Securities [Member] | Investment Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 5,271 5,936
Floating Interest Rate [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 19,700 46,500
Available-for-sale Securities, Amortized Cost Basis 19,700 46,500
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Unrealized Losses (1,970) (1,576)
Available-for-sale Securities, Fair Value Disclosure 17,730 44,924
Floating Interest Rate [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 61,070 74,744
Available-for-sale Securities, Amortized Cost Basis 60,842 74,491
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 4 14
Available-for-sale Securities, Unrealized Losses (847) (776)
Available-for-sale Securities, Fair Value Disclosure 59,999 73,729
Trading Securities [Abstract]    
Trading Securities - Amount Outstanding 1,887 2,211
Trading Securities, Debt, Amortized Cost 1,887 2,211
Trading Securities, Unrealized Gains 0 0
Trading Securities, Unrealized Losses (1,606) (1,720)
Trading, at fair value 281 491
Floating Interest Rate [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 10,000 10,000
Available-for-sale Securities, Amortized Cost Basis 10,000 10,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2 0
Available-for-sale Securities, Unrealized Losses 0 (9)
Available-for-sale Securities, Fair Value Disclosure 10,002 9,991
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 1,261,876 1,353,495
Available-for-sale Securities, Amortized Cost Basis 1,264,971 1,357,010
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,600 2,768
Available-for-sale Securities, Unrealized Losses (3,254) (4,319)
Available-for-sale Securities, Fair Value Disclosure 1,264,317 1,355,459
Floating Interest Rate [Member] | GSE Subordinated Debt [Member}    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 70,000 70,000
Available-for-sale Securities, Amortized Cost Basis 70,000 70,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Unrealized Losses (4,896) (3,751)
Available-for-sale Securities, Fair Value Disclosure 65,104 66,249
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 0 0
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (228) (253)
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 0 0
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 3,095 3,515
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | GSE Subordinated Debt [Member}    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 0 0
Floating Interest Rate [Member] | Trading Securities [Member] | Asset-backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 0 0
Fixed Interest Rate [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance   10,000
Available-for-sale Securities, Amortized Cost Basis   9,999
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   0
Available-for-sale Securities, Unrealized Losses   (5)
Available-for-sale Securities, Fair Value Disclosure   9,994
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 613 692 [1]
Available-for-sale Securities, Amortized Cost Basis 3,421 3,809 [1]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 4,344 4,095 [1]
Available-for-sale Securities, Unrealized Losses 0 0 [1]
Available-for-sale Securities, Fair Value Disclosure 7,765 [2] 7,904 [1]
Derivative, Notional Amount 147,300 148,500
Fixed Interest Rate [Member] | Senior Agency Debt [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 175,000 214,000
Available-for-sale Securities, Amortized Cost Basis 174,989 213,975
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 9 12
Available-for-sale Securities, Unrealized Losses 0 0
Available-for-sale Securities, Fair Value Disclosure 174,998 213,987
Fixed Interest Rate [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Available-for-Sale Securities Unpaid Principal Balance 860,150 993,680
Available-for-sale Securities, Amortized Cost Basis 859,757 993,263
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,007 2
Available-for-sale Securities, Unrealized Losses 0 (477)
Available-for-sale Securities, Fair Value Disclosure 860,764 992,788
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Corporate Debt Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount)   (1)
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) 2,808 3,117 [1]
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Senior Agency Debt [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (11) (25)
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) (393) (417)
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Interest-Only-Strip [Member]    
Available-for-sale Securities [Abstract]    
Unamortized Premium/(Discount) $ 7,100 $ 7,200
[1] Fair value includes $7.2 million of an interest-only security with a notional amount of $148.5 million.
[2] Fair value includes $7.1 million of an interest-only security with a notional amount of $147.3 million. As of December 31, 2015 Amount Outstanding Unamortized Premium/(Discount) AmortizedCost UnrealizedGains UnrealizedLosses Fair Value (in thousands)Available-for-sale: Floating rate auction-rate certificates backed by Government guaranteed student loans$46,500 $— $46,500 $— $(1,576) $44,924Floating rate asset-backed securities74,744 (253) 74,491 14 (776) 73,729Floating rate corporate debt securities10,000 — 10,000 — (9) 9,991Fixed rate corporate debt securities10,000 (1) 9,999 — (5) 9,994Floating rate Government/GSE guaranteed mortgage-backed securities1,353,495 3,515 1,357,010 2,768 (4,319) 1,355,459Fixed rate GSE guaranteed mortgage-backed securities(1)692 3,117 3,809 4,095 — 7,904Floating rate GSE subordinated debt70,000 — 70,000 — (3,751) 66,249Fixed rate senior agency debt214,000 (25) 213,975 12 — 213,987Fixed rate U.S. Treasuries993,680 (417) 993,263 2 (477) 992,788Total available-for-sale2,773,111 5,936 2,779,047 6,891 (10,913) 2,775,025Trading: Floating rate asset-backed securities2,211 — 2,211 — (1,720) 491Total investment securities$2,775,322 $5,936 $2,781,258 $6,891 $(12,633) $2,775,516