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Investment Securities (Investments Classified by Maturity Date) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: Due in one year or less, amortized cost $ 14,556  
Investment Securities Available-for-Sale: Due in one year or less, fair value 14,476  
Investment Securities Available-for-Sale: Due after one year through five years, amortized cost 96,758  
Investment Securities Available-for-Sale: Due after on eyear through five years, fair value 97,606  
Investment Securities Available-for-Sale: Due after five years through ten years, amortized cost 116,072  
Investment Securities Available-for-Sale: Dur after five years through ten years, fair value 117,896  
Investment Securities Available-for-Sale: Due after ten years, amortized cost 126,779  
Investment Securities Available-for-Sale: Due after ten years, fair value 126,763  
Investment Securities Available-for-Sale: amortized cost 11,229  
Investment Securities Available-for-Sale: fair value 11,255  
Available-for-sale Securities, Amortized Cost Basis 462,700 417,939
Available-for-sale Securities 467,190 414,507
Investment Securities Held-to-Maturity: Due after five years through ten years, amortized cost 5,498  
Investment Securities Held-to-Maturity: Due after five through ten years, fair value 5,607  
Investment Securities Held-to-Maturity: Due after ten years, amortized cost 51,317  
Investment Securities Held-to-Maturity: Due after ten years, fair value 54,688  
Investment Securities Held-to-Maturity: amoritzed cost 6,182  
Investment Securities Held-to-Maturity: fair value 6,267  
Held-to-maturity Securities 62,997 72,233
Held-to-maturity Securities, Fair Value 66,562 74,922
Marketable Securities 525,697  
Marketable Securities, Fair Value Disclosure 533,752  
Equity securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 772  
Investment Securities Available-for-Sale: fair value 601  
Available-for-sale Securities, Amortized Cost Basis 772 535
Available-for-sale Securities 601 262
Residential mortgage-backed securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 86,792  
Investment Securities Available-for-Sale: fair value 88,794  
Available-for-sale Securities, Amortized Cost Basis 86,792 113,213
Available-for-sale Securities 88,794 115,364
Commercial mortgage-backed securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 9,742  
Investment Securities Available-for-Sale: fair value 9,799  
Available-for-sale Securities, Amortized Cost Basis 9,742  
Available-for-sale Securities 9,799  
Held-to-maturity Securities, Fair Value $ 6,267 $ 6,207