Investment Securities (Amortized Cost And Fair Value Of Investment Securities By Contractual Maturities) (Details) (USD $) In Thousands	Jun. 30, 2011
Investment Securities
Amortized Cost of Securities Available-for-sale, Due in one year or less	$ 2,004
Fair Value of Securities Available-for-sale, Due in one year or less	2,009
Amortized Cost of Securities Available-for-sale, Due after one year through five years	91,525
Fair Value of Securities Available-for-sale, Due after one year through five years	90,814
Amortized Cost of Securities Held-to-Maturity, Due after one year through five years	99,943
Fair Value of Securities Held-to-Maturity, Due after one year through five years	102,148
Amortized Cost of Securities Available-for-sale, Due after five years through ten years	740,719
Fair Value of Securities Available-for-sale, Due after five years through ten years	737,743
Amortized Cost of Securities Held-to-Maturity, Due after five years through ten years	21,364
Fair Value of Securities Held-to-Maturity, Due after five years through ten years	21,474
Amortized Cost of Securities Available-for-sale, Due after ten years	342,694	[1]
Fair Value of Securities Available-for-sale, Due after ten years	353,938	[1]
Amortized Cost of Securities Held-to-Maturity, Due after ten years	1,150,460	[1]
Fair Value of Securities Held-to-Maturity, Due after ten years	1,163,354	[1]
Amortized Cost of Securities Available-for-sale, Total	1,176,942
Fair Value of Securities Available-for-sale, Total	1,184,504
Amortized Cost of Securities Held-to-Maturity, Total	1,271,767
Fair Value of Securities Held-to-Maturity, Total	$ 1,286,976

[1] Equity securities are reported in this category