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Investments (Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Securities held-to-maturity, Amortized Cost $ 86,518 $ 88,937
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 3,082 1,949
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 0 76
Securities held-to-maturity, Estimated Fair Value 89,600 90,810
Other Investments and Securities, at Cost 9,960 12,915
Other Investment Not Readily Marketable, Fair Value 9,960 12,915
U.S. Government Agencies Mortgage-backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held-to-maturity, Amortized Cost 82,518 84,937
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 3,082 1,949
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 0 76
Securities held-to-maturity, Estimated Fair Value 85,600 86,810
Trust Preferred Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Securities held-to-maturity, Amortized Cost 4,000 4,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 0 0
Held-to-maturity Securities, 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 Investments and Securities, at Cost 9,960 12,915
Other Investment Not Readily Marketable, Fair Value $ 9,960 $ 12,915