Investment Securities - Schedule of Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Investment Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 2,504,124	$ 2,203,928
Available-for-sale Securities, Unrealized Gains	18,025	10,993
Available-for-sale Securities, Unrealized Losses	(23,767)	(32,227)
Available-for-sale securities	2,498,382	2,182,694
Available-for-sale, at fair value	2,495,006	2,193,721
Debt Instrument, Unamortized Discount (Premium), Net	9,118	10,207
Marketable Securities	2,499,333	2,198,859
Marketable Securities, Amortized Cost	2,508,451	2,209,066
Marketable Securities, Unrealized Gains	18,025	10,993
Marketable Securities, Unrealized Losses	(26,847)	(35,569)
Marketable securities	2,499,629	2,184,490
Floating Interest Rate [Member] \| Auction-rate certificates backed by Government guaranteed student loans
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	74,100	74,100
Available-for-sale Securities, Unrealized Gains	0	0
Available-for-sale Securities, Unrealized Losses	(10,941)	(13,887)
Available-for-sale securities	63,159	60,213
Available-for-sale, at fair value	74,100	74,100
Floating Interest Rate [Member] \| Asset-backed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	150,147	178,443
Available-for-sale Securities, Unrealized Gains	933	219
Available-for-sale Securities, Unrealized Losses	(36)	(102)
Available-for-sale securities	151,044	178,560
Trading, at fair value	4,327	5,138
Available-for-sale, at fair value	150,519	178,985
Trading Securities Amortized Cost	4,327	5,138
Trading Securities, Unrealized Gains	0	0
Trading Securities, Unrealized Losses	(3,080)	(3,342)
Trading securities	1,247	1,796
Floating Interest Rate [Member] \| Corporate Debt Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	76,313	74,152
Available-for-sale Securities, Unrealized Gains	450	69
Available-for-sale Securities, Unrealized Losses	0	(388)
Available-for-sale securities	76,763	73,833
Available-for-sale, at fair value	76,345	74,345
Floating Interest Rate [Member] \| Government/GSE Guaranteed Mortgage Backed Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	705,035	759,567
Available-for-sale Securities, Unrealized Gains	8,035	4,852
Available-for-sale Securities, Unrealized Losses	(211)	(381)
Available-for-sale securities	712,859	764,038
Available-for-sale, at fair value	699,062	752,533
Floating Interest Rate [Member] \| GSE Subordinated Debt
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	70,000	70,000
Available-for-sale Securities, Unrealized Gains	0	0
Available-for-sale Securities, Unrealized Losses	(12,569)	(17,438)
Available-for-sale securities	57,431	52,562
Available-for-sale, at fair value	70,000	70,000
Floating Interest Rate [Member] \| Senior Agency Debt Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	49,994	38,000
Available-for-sale Securities, Unrealized Gains	61	32
Available-for-sale Securities, Unrealized Losses	0	0
Available-for-sale securities	50,055	38,032
Available-for-sale, at fair value	50,000	38,000
Fixed Interest Rate [Member] \| Asset-backed Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	6,501
Available-for-sale Securities, Unrealized Gains	0
Available-for-sale Securities, Unrealized Losses	0
Available-for-sale securities	6,501
Available-for-sale, at fair value	6,501
Fixed Interest Rate [Member] \| Corporate Debt Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	52,212	38,678
Available-for-sale Securities, Unrealized Gains	204	27
Available-for-sale Securities, Unrealized Losses	0	(6)
Available-for-sale securities	52,416	38,699
Available-for-sale, at fair value	51,969	38,068
Fixed Interest Rate [Member] \| Government/GSE Guaranteed Mortgage Backed Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,911	3,106
Available-for-sale Securities, Unrealized Gains	154	254
Available-for-sale Securities, Unrealized Losses	0	0
Available-for-sale securities	2,065	3,360
Available-for-sale, at fair value	1,910	3,108
Fixed Interest Rate [Member] \| Commercial Paper [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis		9,999
Available-for-sale Securities, Unrealized Gains		1
Available-for-sale Securities, Unrealized Losses		0
Available-for-sale securities		10,000
Available-for-sale, at fair value		10,000
Fixed Interest Rate [Member] \| Senior Agency Debt Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	72,987	79,255
Available-for-sale Securities, Unrealized Gains	128	19
Available-for-sale Securities, Unrealized Losses	(1)	(21)
Available-for-sale securities	73,114	79,253
Available-for-sale, at fair value	72,700	79,000
Fixed Interest Rate [Member] \| US Treasury Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,165,640	798,966
Available-for-sale Securities, Unrealized Gains	258	304
Available-for-sale Securities, Unrealized Losses	(9)	(4)
Available-for-sale securities	1,165,889	799,266
Available-for-sale, at fair value	1,163,400	797,082
Fixed Interest Rate [Member] \| GSE Preferred Stock
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	79,284	79,662
Available-for-sale Securities, Unrealized Gains	7,802	5,216
Available-for-sale Securities, Unrealized Losses	0	0
Available-for-sale securities	87,086	84,878
Available-for-sale, at fair value	78,500	78,500
Investment Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Trading, at fair value	1,247	1,796
Available-for-sale, at fair value	2,498,382	2,182,694
Marketable Securities	2,499,629	2,184,490
Available-for-sale Securities [Member] \| Investment Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	9,118	10,207
Available-for-sale Securities [Member] \| Floating Interest Rate [Member] \| Auction-rate certificates backed by Government guaranteed student loans
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	(372)	(542)
Available-for-sale Securities [Member] \| Floating Interest Rate [Member] \| Corporate Debt Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	(32)	(193)
Available-for-sale Securities [Member] \| Floating Interest Rate [Member] \| Government/GSE Guaranteed Mortgage Backed Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	5,973	7,034
Available-for-sale Securities [Member] \| Floating Interest Rate [Member] \| GSE Subordinated Debt
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
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	(6)	0
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
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	243	610
Available-for-sale Securities [Member] \| Fixed Interest Rate [Member] \| Government/GSE Guaranteed Mortgage Backed Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	1	(2)
Available-for-sale Securities [Member] \| Fixed Interest Rate [Member] \| Commercial Paper [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net		(1)
Available-for-sale Securities [Member] \| Fixed Interest Rate [Member] \| Senior Agency Debt Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	287	255
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	2,240	1,884
Available-for-sale Securities [Member] \| Fixed Interest Rate [Member] \| GSE Preferred Stock
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	784	1,162
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

Marketable Securities, Amortized Cost Basis

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

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