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Investment Securities (Investments Classified by Maturity Date) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: Due in one year or less, amortized cost $ 22,762  
Investment Securities Available-for-Sale: Due in one year or less, fair value 22,775  
Investment Securities Available-for-Sale: Due after one year through five years, amortized cost 108,756  
Investment Securities Available-for-Sale: Due after on eyear through five years, fair value 111,597  
Investment Securities Available-for-Sale: Due after five years through ten years, amortized cost 138,074  
Investment Securities Available-for-Sale: Dur after five years through ten years, fair value 143,806  
Investment Securities Available-for-Sale: Due after ten years, amortized cost 142,209  
Investment Securities Available-for-Sale: Due after ten years, fair value 145,424  
Available-for-sale Securities, Amortized Cost Basis 495,859 417,939
Available-for-sale Securities 509,605 414,507
Investment Securities Held-to-Maturity: Due after five years through ten years, amortized cost 6,741  
Investment Securities Held-to-Maturity: Due after five through ten years, fair value 6,971  
Investment Securities Held-to-Maturity: Due after ten years, amortized cost 44,164  
Investment Securities Held-to-Maturity: Due after ten years, fair value 48,207  
Investment Securities Held-to-Maturity: amoritzed cost 5,598  
Investment Securities Held-to-Maturity: fair value 5,768  
Held-to-maturity Securities 56,503 72,233
Held-to-maturity Securities, Fair Value 60,946 74,922
Marketable Securities 552,362  
Marketable Securities, Fair Value Disclosure 570,551  
Equity securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 635  
Investment Securities Available-for-Sale: fair value 456  
Available-for-sale Securities, Amortized Cost Basis 635 535
Available-for-sale Securities 456 262
Residential mortgage-backed securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 57,695  
Investment Securities Available-for-Sale: fair value 59,499  
Available-for-sale Securities, Amortized Cost Basis 57,695 113,213
Available-for-sale Securities 59,499 115,364
Commercial mortgage-backed securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 9,734  
Investment Securities Available-for-Sale: fair value 10,001  
Available-for-sale Securities, Amortized Cost Basis 9,734  
Available-for-sale Securities 10,001  
Held-to-maturity Securities, Fair Value 5,768 6,207
Other securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 15,994  
Investment Securities Available-for-Sale: fair value 16,047  
Available-for-sale Securities, Amortized Cost Basis 15,994 5,882
Available-for-sale Securities $ 16,047 $ 5,883