Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Securities Available-for-Sale, Amortized Cost
Securities Available-for-Sale, Due in one year or less, Cost	$ 4,026
Securities Available-for-Sale, Due after one year through five years, Cost	25,063
Securities Available-for-Sale, Due after five years through ten years, Cost	35,413
Securities Available-for-Sale, Due after ten years, Cost	330,011
Securities Available-for-Sale, Cost, Total	394,513
Securities Available-for-Sale, Estimated Fair Value
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value	4,084
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value	17,326
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value	44,738
Securities Available-for-Sale, Due after ten years, Estimated Fair Value	337,929
Securities Available-for-Sale, Estimated Fair Value, Total	404,077
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	83,208
Securities held-to-maturity, Amortized Cost	83,208	$ 88,937
Securities Held-to-Maturity, Estimated Fair Value
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value	86,944
Securities held-to-maturity, Estimated Fair Value	$ 86,944	$ 90,810