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Investment Securities (Investments Classified by Maturity Date) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: Due in one year or less, amortized cost $ 21,193  
Investment Securities Available-for-Sale: Due in one year or less, fair value 21,245  
Investment Securities Available-for-Sale: Due after one year through five years, amortized cost 110,359  
Investment Securities Available-for-Sale: Due after on eyear through five years, fair value 113,410  
Investment Securities Available-for-Sale: Due after five years through ten years, amortized cost 134,647  
Investment Securities Available-for-Sale: Dur after five years through ten years, fair value 140,658  
Investment Securities Available-for-Sale: Due after ten years, amortized cost 144,436  
Investment Securities Available-for-Sale: Due after ten years, fair value 148,226  
Available-for-sale Securities, Amortized Cost Basis 482,440 417,939
Available-for-sale Securities 496,815 414,507
Investment Securities Held-to-Maturity: Due after five years through ten years, amortized cost 2,578  
Investment Securities Held-to-Maturity: Due after five through ten years, fair value 2,807  
Investment Securities Held-to-Maturity: Due after ten years, amortized cost 49,985  
Investment Securities Held-to-Maturity: Due after ten years, fair value 53,974  
Held-to-maturity Securities 58,064 72,233
Held-to-maturity Securities, Fair Value 62,431 74,922
Marketable Securities 540,504  
Marketable Securities, Fair Value Disclosure 559,246  
Equity securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 535  
Investment Securities Available-for-Sale: fair value 325  
Available-for-sale Securities, Amortized Cost Basis 535 535
Available-for-sale Securities 325 262
Residential mortgage-backed securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 52,400  
Investment Securities Available-for-Sale: fair value 53,784  
Available-for-sale Securities, Amortized Cost Basis 52,400 113,213
Available-for-sale Securities 53,784 115,364
Commercial mortgage-backed securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 9,725  
Investment Securities Available-for-Sale: fair value 9,969  
Available-for-sale Securities, Amortized Cost Basis 9,725  
Available-for-sale Securities 9,969  
Investment Securities Held-to-Maturity: amoritzed cost 5,501  
Investment Securities Held-to-Maturity: fair value 5,650  
Held-to-maturity Securities, Fair Value 5,650 6,207
Other securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 9,145  
Investment Securities Available-for-Sale: fair value 9,198  
Available-for-sale Securities, Amortized Cost Basis 9,145 5,882
Available-for-sale Securities $ 9,198 $ 5,883