Investment Securities - Schedule of Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Investment Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 2,293,163	$ 2,504,124
Available-for-sale Securities, Unrealized Gains	18,796	18,025
Available-for-sale Securities, Unrealized Losses	(15,772)	(23,767)
Available-for-sale securities	2,296,187	2,498,382
Available-for-sale, at fair value	2,284,443	2,495,006
Debt Instrument, Unamortized Discount (Premium), Net	8,720	9,118
Marketable Securities	2,288,456	2,499,333
Marketable Securities, Amortized Cost	2,297,176	2,508,451
Marketable Securities, Unrealized Gains	18,796	18,025
Marketable Securities, Unrealized Losses	(18,656)	(26,847)
Marketable Securities	2,297,316	2,499,629
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	(8,887)	(10,941)
Available-for-sale securities	65,213	63,159
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	145,784	150,147
Available-for-sale Securities, Unrealized Gains	905	933
Available-for-sale Securities, Unrealized Losses	(11)	(36)
Available-for-sale securities	146,678	151,044
Trading, at fair value	4,013	4,327
Available-for-sale, at fair value	146,110	150,519
Trading Securities Amortized Cost	4,013	4,327
Trading Securities, Unrealized Gains	0	0
Trading Securities, Unrealized Losses	(2,884)	(3,080)
Trading securities	1,129	1,247
Floating Interest Rate [Member] \| Corporate Debt Securities
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	91,329	76,313
Available-for-sale Securities, Unrealized Gains	475	450
Available-for-sale Securities, Unrealized Losses	0	0
Available-for-sale securities	91,804	76,763
Available-for-sale, at fair value	91,345	76,345
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	678,886	705,035
Available-for-sale Securities, Unrealized Gains	9,096	8,035
Available-for-sale Securities, Unrealized Losses	(4)	(211)
Available-for-sale securities	687,978	712,859
Available-for-sale, at fair value	673,283	699,062
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	(6,849)	(12,569)
Available-for-sale securities	63,151	57,431
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	49,997	49,994
Available-for-sale Securities, Unrealized Gains	51	61
Available-for-sale Securities, Unrealized Losses	0	0
Available-for-sale securities	50,048	50,055
Available-for-sale, at fair value	50,000	50,000
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	2,983	6,501
Available-for-sale Securities, Unrealized Gains	0	0
Available-for-sale Securities, Unrealized Losses	(3)	0
Available-for-sale securities	2,980	6,501
Available-for-sale, at fair value	2,983	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	62,258	52,212
Available-for-sale Securities, Unrealized Gains	117	204
Available-for-sale Securities, Unrealized Losses	(18)	0
Available-for-sale securities	62,357	52,416
Available-for-sale, at fair value	62,000	51,969
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	1,581	1,911
Available-for-sale Securities, Unrealized Gains	123	154
Available-for-sale Securities, Unrealized Losses	0	0
Available-for-sale securities	1,704	2,065
Available-for-sale, at fair value	1,580	1,910
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	119,474	72,987
Available-for-sale Securities, Unrealized Gains	147	128
Available-for-sale Securities, Unrealized Losses	0	(1)
Available-for-sale securities	119,621	73,114
Available-for-sale, at fair value	119,000	72,700
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	908,996	1,165,640
Available-for-sale Securities, Unrealized Gains	268	258
Available-for-sale Securities, Unrealized Losses	0	(9)
Available-for-sale securities	909,264	1,165,889
Available-for-sale, at fair value	907,000	1,163,400
Fixed Interest Rate [Member] \| GSE Preferred Stock
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	79,183	79,284
Available-for-sale Securities, Unrealized Gains	7,609	7,802
Available-for-sale Securities, Unrealized Losses	0	0
Available-for-sale securities	86,792	87,086
Available-for-sale, at fair value	78,500	78,500
Fixed Interest Rate [Member] \| Taxable Municipal Bonds [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	8,592
Available-for-sale Securities, Unrealized Gains	5
Available-for-sale Securities, Unrealized Losses	0
Available-for-sale securities	8,597
Available-for-sale, at fair value	8,542
Investment Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Trading, at fair value	1,129	1,247
Available-for-sale, at fair value	2,296,187	2,498,382
Marketable Securities	2,297,316	2,499,629
Available-for-sale Securities [Member] \| Investment Securities [Member]
Schedule of Available-for-sale and Trading Securities [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net	8,720	9,118
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	(326)	(372)
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	(16)	(32)
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	5,603	5,973
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	(3)	(6)
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	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	258	243
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	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	474	287
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	1,996	2,240
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	683	784
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	50
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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This item represents the gross unrealized losses 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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