Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Securities Available-for-Sale, Amortized Cost
Securities Available-for-Sale, Due in one year or less, Cost	$ 1,240
Securities Available-for-Sale, Due after one year through five years, Cost	25,979
Securities Available-for-Sale, Due after five years through ten years, Cost	31,778
Securities Available-for-Sale, Due after ten years, Cost	293,702
Securities Available-for-Sale, Cost, Total	352,699
Securities Available-for-Sale, Estimated Fair Value
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value	1,258
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value	18,326
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value	40,690
Securities Available-for-Sale, Due after ten years, Estimated Fair Value	297,203
Securities Available-for-Sale, Estimated Fair Value, Total	357,477
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	0
Securities Held-to-Maturity, Amortized Cost
Securities Held-to-Maturity, Due after ten years, Cost	86,518
Securities held-to-maturity, Amortized Cost	86,518	$ 88,937
Securities Held-to-Maturity, Estimated Fair Value
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value	89,600
Securities held-to-maturity, Estimated Fair Value	$ 89,600	$ 90,810