Investment Securities (Contractual Maturities of Investments in Debt Securities Available for Sale) (Details) (USD $) In Thousands	Jun. 30, 2011
Due in one year, Amortized Cost	$ 105,767
Due after one year through five years, Amortized Cost	2,912
Due after five years through ten years, Amortized Cost	88,301
Due after ten years, Amortized Cost	106,678
Total investment securities available for sale, Amortized Cost	846,397
Due in one year, Fair Value	105,934
Due after one year through five years, Fair Value	2,996
Due after five years through ten years, Fair Value	90,035
Due after ten years, Fair Value	98,651
Total investment securities available for sale, Fair Value	863,196
Residential Mortgage-Backed Securities [Member]
Securities without a single maturity date, Amortized Cost	494,815
Securities without a single maturity date, Fair Value	514,398
Equity Securities [Member]
Securities without a single maturity date, Amortized Cost	47,924
Securities without a single maturity date, Fair Value	$ 51,182

This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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

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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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