Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Securities held-to-maturity, Amortized Cost	$ 69,798	$ 75,169
Securities held-to-maturity, Accumulated Unrecognized Holding Gain	1,422	1,346
Securities held-to-maturity, Accumulated Unrecognized Holding Loss	13	70
Securities held-to-maturity, Estimated Fair Value	71,207	76,445
Other investment securities, at Cost	16,039	14,352
Other investment securities, Fair Value	16,039	14,352
U.S. Government Agencies Mortgage-backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities held-to-maturity, Amortized Cost	65,798	71,169
Securities held-to-maturity, Accumulated Unrecognized Holding Gain	1,422	1,346
Securities held-to-maturity, Accumulated Unrecognized Holding Loss	13	70
Securities held-to-maturity, Estimated Fair Value	67,207	72,445
Trust Preferred Securities [Member]
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
Non-Marketable Equity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Other investment securities, at Cost	16,039	14,352
Other investment securities, Fair Value	$ 16,039	$ 14,352