Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Securities Held-to-Maturity, Amortized Cost	$ 60,030	$ 64,449
Securities held-to-maturity, Accumulated Unrecognized Holding Gain	0	1,222
Securities held-to-maturity, Accumulated Unrecognized Holding Loss	402	25
Securities held-to-maturity, Estimated Fair Value	59,628	65,646
U.S. Government Agencies Mortgage-backed Securities
Schedule of Held-to-maturity Securities [Line Items]
Securities Held-to-Maturity, Amortized Cost	56,030	60,449
Securities held-to-maturity, Accumulated Unrecognized Holding Gain	0	1,222
Securities held-to-maturity, Accumulated Unrecognized Holding Loss	402	25
Securities held-to-maturity, Estimated Fair Value	55,628	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