Investment Securities (Details 1) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Amortized cost and fair values of investment securities available for sale by contractual maturity
Due in one year or less, Amortized cost	$ 49,808
Due after one year through five years, Amortized cost	159,225
Due after five years through ten years, Amortized cost	543,481
Due after five years through ten years, Amortized cost	115,260
Total debt securities, Amortized cost	867,774
Due in one year or less, Fair value	50,444
Due after one year through five years, Fair value	164,076
Due after five years through ten years, Fair value	566,183
Due after ten years, Fair value	116,887
Total debt securities, Fair value	897,590
Total investment securities available for sale, Amortized Cost	5,571,851	6,011,976
Investment securities available for sale, carrying amount	5,742,034	6,101,341
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	4,441,048	4,831,481
Investment securities available for sale, carrying amount	4,578,387	4,910,497
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	12,499	7,604
Investment securities available for sale, carrying amount	13,050	7,753
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	243,387	299,459
Investment securities available for sale, carrying amount	243,115	298,841
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	7,143
Investment securities available for sale, carrying amount	$ 9,892

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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