Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Investments [Abstract]
Securities Available-for-Sale, Due in one year or less, Cost	$ 7,229
Securities Available-for-Sale, Due after one year through five years, Cost	33,449
Securities Available-for-Sale, Due after five years through ten years, Cost	46,821
Securities Available-for-Sale, Due after ten years, Cost	288,989
Securities Available-for-Sale, Cost, Total	376,488
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value	7,275
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value	33,844
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value	48,827
Securities Available-for-Sale, Due after ten years, Estimated Fair Value	294,027
Securities Available-for-Sale, Estimated Fair Value, Total	383,973
Securities Held-to-Maturity, Due after ten years, Cost	13,444
Securities Held-to-Maturity, Cost, Total	13,444
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value	13,658
Securities Held-to-Maturity, Estimated Fair Value, Total	$ 13,658