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Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]    
Securities held-to-maturity, Amortized Cost $ 72,308 $ 75,169
Securities held-to-maturity, Accumulated Unrecognized Holding Gain 1,392 1,346
Securities held-to-maturity, Accumulated Unrecognized Holding Loss 44 70
Securities held-to-maturity, Estimated Fair Value 73,656 76,445
Other investment securities, at Cost 10,240 14,352
Other investment securities, Fair Value 10,240 14,352
U.S. Government Agencies Mortgage-backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held-to-maturity, Amortized Cost 68,308 71,169
Securities held-to-maturity, Accumulated Unrecognized Holding Gain 1,392 1,346
Securities held-to-maturity, Accumulated Unrecognized Holding Loss 44 70
Securities held-to-maturity, Estimated Fair Value 69,656 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 10,240 14,352
Other investment securities, Fair Value $ 10,240 $ 14,352