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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Other investment securities      
Amortized Cost $ 7,996 $ 18,292 $ 20,422
Fair Value 7,996 18,292 20,422
Amortized Cost      
Due in one year or less 1,311    
Due after one year through five years 701    
Due after five years through ten years 9,051    
Due after ten years 5,505    
Total 16,568    
Fair Value      
Due in one year or less 1,331    
Due after one year through five years 709    
Due after five years through ten years 9,659    
Due after ten years 6,051    
Fair Value 17,750 17,864 19,872
Amortized Cost      
Due in one year or less 1,371    
Due after one year through five years 11,845    
Due after five years through ten years 71,060    
Due after ten years 377,977    
Total 462,253 279,689 272,157
Fair Value      
Due in one year or less 1,382    
Due after one year through five years 12,066    
Due after five years through ten years 73,370    
Due after ten years 389,205    
Fair Value 476,023 289,195 281,926
Federal Reserve Bank stock
     
Other investment securities      
Amortized Cost   7,028 7,028
Fair Value   7,028 7,028
Federal Home Loan Bank stock
     
Other investment securities      
Amortized Cost 6,664 9,932 12,062
Fair Value 6,664 9,932 12,062
Investment in unconsolidated subsidiaries
     
Other investment securities      
Amortized Cost 1,332 1,332 1,332
Fair Value $ 1,332 $ 1,332 $ 1,332