Investment Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Amortized cost and fair values of investment securities available for sale by contractual maturity
Due in one year or less, Amortized cost	$ 44,685
Due after one year through five years, Amortized cost	202,823
Due after five years through ten years, Amortized cost	556,206
Due after ten years, Amortized cost	76,516
Total debt securities, Amortized cost	880,230
Due in one year or less, Fair value	45,223
Due after one year through five years, Fair value	209,057
Due after five years through ten years, Fair value	588,599
Due after ten years, Fair value	80,355
Total debt securities, Fair value	923,234
Total investment securities available for sale, Amortized Cost	4,508,971	4,775,400
Investment securities available for sale, at fair value	4,669,100	4,937,483
Residential mortgage-related securities [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Total investment securities available for sale, Amortized Cost	3,440,370	3,674,696
Investment securities available for sale, at fair value	3,554,430	3,785,590
Commercial mortgage-related securities [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Total investment securities available for sale, Amortized Cost	17,779	16,647
Investment securities available for sale, at fair value	19,303	18,543
Asset-backed securities [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Total investment securities available for sale, Amortized Cost	163,466	188,439
Investment securities available for sale, at fair value	163,014	187,732
Equity Securities [Member]
Amortized cost and fair values of investment securities available for sale by contractual maturity
Total investment securities available for sale, Amortized Cost	7,126
Investment securities available for sale, at fair value	$ 9,119

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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For an unclassified balance sheet, total of debt 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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