Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Investments [Abstract]
Securities Available-for-Sale, Due in one year or less, Cost	$ 8,374
Securities Available-for-Sale, Due after one year through five years, Cost	38,693
Securities Available-for-Sale, Due after five years through ten years, Cost	46,229
Securities Available-for-Sale, Due after ten years, Cost	273,043
Securities Available-for-Sale, Cost, Total	366,339
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value	8,344
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value	39,656
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value	47,485
Securities Available-for-Sale, Due after ten years, Estimated Fair Value	275,611
Securities Available-for-Sale, Estimated Fair Value, Total	371,096
Securities Held-to-Maturity, Due after ten years, Cost	19,319
Securities Held-to-Maturity, Cost, Total	19,319
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value	19,627
Securities Held-to-Maturity, Estimated Fair Value, Total	$ 19,627