Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Securities Available-for-Sale, Due in one year or less, Cost	$ 4,717
Securities Available-for-Sale, Due after one year through five years, Cost	14,609
Securities Available-for-Sale, Due after five years through ten years, Cost	29,106
Securities Available-for-Sale, Due after ten years, Cost	218,248
Securities Available-for-Sale, Cost, Total	266,680
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value	4,732
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value	15,068
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value	29,826
Securities Available-for-Sale, Due after ten years, Estimated Fair Value	219,176
Securities Available-for-Sale, Estimated Fair Value, Total	268,802
Securities Held-to-Maturity, Due after ten years, Cost	87,455
Securities held-to-maturity, Amortized Cost	87,455	90,786
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value	91,117
Securities held-to-maturity, Estimated Fair Value	$ 91,117	$ 94,191