Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) (USD $) In Thousands	Sep. 30, 2011
Available-for-sale Securities [Abstract]
Due within one year, Amortized Cost	$ 43,868
Due after one year through five years, Amortized Cost	91,742
Due after five years through ten years, Amortized Cost	168,119
Due after ten years, Amortized Cost	647,405
Total investment securities available-for-sale, Amortized Cost	951,134
Due within one year, Fair Value	44,136
Due after one year through five years, Fair Value	94,242
Due after five years through ten years, Fair Value	176,815
Due after ten years, Fair Value	677,330
Total investment securities available-for-sale, Fair Value	$ 992,523

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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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For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

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