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Investment Securities (Investments Classified by Maturity Date) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: Due in one year or less, amortized cost $ 20,274  
Investment Securities Available-for-Sale: Due in one year or less, fair value 20,337  
Investment Securities Available-for-Sale: Due after one year through five years, amortized cost 103,422  
Investment Securities Available-for-Sale: Due after on eyear through five years, fair value 106,528  
Investment Securities Available-for-Sale: Due after five years through ten years, amortized cost 131,744  
Investment Securities Available-for-Sale: Dur after five years through ten years, fair value 139,112  
Investment Securities Available-for-Sale: Due after ten years, amortized cost 123,617  
Investment Securities Available-for-Sale: Due after ten years, fair value 126,253  
Investment Securities Available-for-Sale: Total, amortized cost 443,400  
Investment Securities Available-for-Sale: Fair Value 458,004 496,815
Investment Securities Held-to-Maturity: Due after five years through ten years, amortized cost 5,195  
Investment Securities Held-to-Maturity: Due after five through ten years, fair value 5,491  
Investment Securities Held-to-Maturity: Due after ten years, amortized cost 67,892  
Investment Securities Held-to-Maturity: Due after ten years, fair value 71,170  
Investment Securities Held-to-Maturity: amoritzed cost 5,125  
Investment Securities Held-to-Maturity: fair value 5,260  
Investment Securities Held-to-Maturity: Total, amortized cost 78,212  
Investment Securities Held-to-Maturity: Total, fair value 81,921  
Marketable Securities 521,612  
Marketable Securities, Fair Value Disclosure 539,925  
Residential mortgage-backed securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 50,180  
Investment Securities Available-for-Sale: fair value 51,514  
Investment Securities Available-for-Sale: Fair Value 51,514 53,784
Commercial mortgage-backed securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 9,717  
Investment Securities Available-for-Sale: fair value 9,926  
Investment Securities Available-for-Sale: Fair Value 9,926 9,969
Equity securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 535  
Investment Securities Available-for-Sale: fair value 370  
Investment Securities Available-for-Sale: Fair Value 370 325
Other securities [Member]
   
Schedule of Investments [Line Items]    
Investment Securities Available-for-Sale: amortized cost 3,911  
Investment Securities Available-for-Sale: fair value 3,964  
Investment Securities Available-for-Sale: Fair Value $ 3,964 $ 9,198