Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Available-for-sale Securities [Abstract]
Due within one year, Amortized Cost	$ 18,270
Due after one year through five years, Amortized Cost	139,044
Due after five years through ten years, Amortized Cost	169,482
Due after ten years, Amortized Cost	626,530
No stated maturity date, Amortized Cost Basis	3,310
Total investment securities available-for-sale, Amortized Cost	956,636
Due within one year, Fair Value	18,553
Due after one year through five years, Fair Value	142,225
Due after five years through ten years, Fair Value	178,051
Due after ten years, Fair Value	655,550
No stated maturity date, Fair Value	3,384
Total investment securities available-for-sale, Fair Value	$ 997,763

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