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Investment Securities (Maturities of Debt Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Investment Securities Available-for-Sale:      
Due in one year or less, Amortized Cost $ 91,500    
Due after one year through five years, Amortized Cost 117,337    
Due after five years through ten years, Amortized Cost 426,031    
Due after ten years, Amortized Cost 71,398    
Preferred stock, Amortized Cost 1,389    
Total Available-for-sale Securities, Debt Maturities, Amortized Cost 707,655    
Due in one year or less , Fair Value 91,946    
Due after one year through five years, Fair Value 118,555    
Due after five years through ten years, Fair Value 422,118    
Due after ten years, Fair Value 70,930    
Preferred stock, Fair Value 1,597    
Total Available-for-sale securities, Debt maturities, Fair Value 705,146    
Investment Securities Held-to-Maturity:      
Due in one year or less, Amortized Cost 42,112    
Due after one year through five years, Amortized Cost 114,020    
Due after five years through ten years, Amortized Cost 74,316    
Due after ten years, Amortized Cost 52,131    
Total Held-to-maturity securities, Debt maturities, Amortized Cost 282,579 229,977 221,536
Due in one year or less , Fair Value 42,179    
Due after one year through five years, Fair Value 115,646    
Due after five years through ten years, Fair Value 74,353    
Due after ten years, Fair Value 43,688    
Total Held-to-maturity securities, Debt maturities, Fair Value $ 275,866 $ 229,922 $ 223,185