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Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Securities Available-for-Sale, Amortized Cost    
Securities Available-for-Sale, Due in one year or less, Cost $ 2,838  
Securities Available-for-Sale, Due after one year through five years, Cost 14,590  
Securities Available-for-Sale, Due after five years through ten years, Cost 27,168  
Securities Available-for-Sale, Due after ten years, Cost 249,657  
Securities Available-for-Sale, Cost, Total 294,253  
Securities Available-for-Sale, Estimated Fair Value    
Securities Available-for-Sale, Due in one year or less, Estimated Fair Value 15,831  
Securities Available-for-Sale, Due after one year through five years, Estimated Fair Value 14,976  
Securities Available-for-Sale, Due after five years through ten years, Estimated Fair Value 27,464  
Securities Available-for-Sale, Due after ten years, Estimated Fair Value 237,962  
Securities Available-for-Sale, Estimated Fair Value, Total 296,233  
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount 0  
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value 0  
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount 0  
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value 0  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount 0  
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value 0  
Securities Held-to-Maturity, Amortized Cost    
Securities Held-to-Maturity, Due after ten years, Cost 81,095  
Securities held-to-maturity, Amortized Cost 81,095 $ 90,786
Securities Held-to-Maturity, Estimated Fair Value    
Securities Held-to-Maturity, Due after ten years, Estimated Fair Value 84,005  
Securities held-to-maturity, Estimated Fair Value $ 84,005 $ 94,191