Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Securities Held-to-Maturity, Amortized Cost	$ 62,277	$ 64,449
Securities held-to-maturity, Accumulated Unrecognized Holding Gain	88	1,222
Securities held-to-maturity, Accumulated Unrecognized Holding Loss	219	25
Securities held-to-maturity, Estimated Fair Value	62,146	65,646
U.S. Government Agencies Mortgage-backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Securities Held-to-Maturity, Amortized Cost	58,277	60,449
Securities held-to-maturity, Accumulated Unrecognized Holding Gain	88	1,222
Securities held-to-maturity, Accumulated Unrecognized Holding Loss	219	25
Securities held-to-maturity, Estimated Fair Value	58,146	61,646
Trust Preferred Securities
Schedule of Held-to-maturity Securities [Line Items]
Securities Held-to-Maturity, Amortized Cost	4,000	4,000
Securities held-to-maturity, Accumulated Unrecognized Holding Gain	0	0
Securities held-to-maturity, Accumulated Unrecognized Holding Loss	0	0
Securities held-to-maturity, Estimated Fair Value	$ 4,000	$ 4,000