Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) (USD $) In Thousands	Jun. 30, 2011
Securities
Due within one year, Amortized Cost	$ 29,452
Due after one year through five years, Amortized Cost	93,873
Due after five years through ten years, Amortized Cost	169,886
Due after ten years, Amortized Cost	659,633
Total investment securities available-for-sale, Amortized Cost	952,844
Due within one year, Fair Value	29,790
Due after one year through five years, Fair Value	96,310
Due after five years through ten years, Fair Value	177,458
Due after ten years, Fair Value	682,942
Total investment securities available-for-sale, Fair Value	$ 986,500

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