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Investment Securities - Amortized cost and fair value of held to maturity and available for sale securities (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Available for Sale - Amortized Cost and Fair Value      
Available for Sale, Amortized Cost $ 1,890,440 $ 1,817,774 $ 1,879,247
Fair value 1,909,426 1,834,593 1,898,815
Held to Maturity - Amortized Cost and Fair Value      
Held to Maturity, Amortized Cost 231,087 244,184 303,636
Fair value 247,087 261,131 318,490
State and political subdivisions
      
Available for Sale - Amortized Cost and Fair Value      
Available for Sale, Amortized Cost, Within 1 year 996    
Available for Sale, Fair Value, Within 1 year 1,005    
Available for Sale, Amortized Cost, 1 to 5 years 14,552    
Available for Sale, Fair Value, 1 to 5 years 15,453    
Available for Sale, Amortized Cost, 5 to 10 years 6,316    
Available for Sale, Fair Value, 5 to 10 years 6,658    
Available for Sale, Amortized Cost, More than 10 years 847    
Available for Sale, Fair Value, More than 10 years 921    
Available for Sale, Amortized Cost 22,711    
Fair value 24,037    
Held to Maturity - Amortized Cost and Fair Value      
Held to Maturity, Amortized Cost, Within 1 year       
Held to Maturity, Fair Value, Within 1 year       
Held to Maturity, Amortized Cost, 1 to 5 years 9,858    
Held to Maturity, Fair Value, 1 to 5 years 10,672    
Held to Maturity, Amortized Cost, 5 to 10 years 26,481    
Held to Maturity, Fair Value, 5 to 10 years 29,490    
Held to Maturity, Amortized Cost, More than 10 years 15,429    
Held to Maturity, Fair Value, More than 10 years 17,269    
Held to Maturity, Amortized Cost 51,768 51,780 51,893
Fair value 57,431 57,266 56,306
Corporate bonds
      
Available for Sale - Amortized Cost and Fair Value      
Available for Sale, Amortized Cost, 1 to 5 years 38,123    
Available for Sale, Fair Value, 1 to 5 years 38,503    
Available for Sale, Amortized Cost, 5 to 10 years 141,961    
Available for Sale, Fair Value, 5 to 10 years 140,119    
Available for Sale, Amortized Cost, More than 10 years 10,759    
Available for Sale, Fair Value, More than 10 years 10,172    
Available for Sale, Amortized Cost 190,843    
Fair value 188,794    
Held to Maturity - Amortized Cost and Fair Value      
Held to Maturity, Amortized Cost, 1 to 5 years       
Held to Maturity, Fair Value, 1 to 5 years       
Held to Maturity, Amortized Cost, 5 to 10 years       
Held to Maturity, Fair Value, 5 to 10 years       
Held to Maturity, Amortized Cost, More than 10 years       
Held to Maturity, Fair Value, More than 10 years       
Held to Maturity, Amortized Cost       
Fair value       
Asset-backed securities
      
Available for Sale - Amortized Cost and Fair Value      
Available for Sale, Amortized Cost, 1 to 5 years 32,384    
Available for Sale, Fair Value, 1 to 5 years 32,405    
Available for Sale, Amortized Cost, 5 to 10 years 142,507    
Available for Sale, Fair Value, 5 to 10 years 143,693    
Available for Sale, Amortized Cost, More than 10 years 48,936    
Available for Sale, Fair Value, More than 10 years 49,772    
Available for Sale, Amortized Cost 223,827    
Fair value 225,870    
Held to Maturity - Amortized Cost and Fair Value      
Held to Maturity, Amortized Cost, 1 to 5 years       
Held to Maturity, Fair Value, 1 to 5 years       
Held to Maturity, Amortized Cost, 5 to 10 years       
Held to Maturity, Fair Value, 5 to 10 years       
Held to Maturity, Amortized Cost, More than 10 years       
Held to Maturity, Fair Value, More than 10 years       
Held to Maturity, Amortized Cost       
Fair value       
Other
      
Available for Sale - Amortized Cost and Fair Value      
Available for Sale, Amortized Cost, More than 10 years 2,414    
Available for Sale, Fair Value, More than 10 years 2,414    
Available for Sale, Amortized Cost 2,414    
Fair value 2,414    
Held to Maturity - Amortized Cost and Fair Value      
Held to Maturity, Amortized Cost, More than 10 years       
Held to Maturity, Fair Value, More than 10 years       
Held to Maturity, Amortized Cost       
Fair value       
Total securities other than mortgage-backed securities
      
Available for Sale - Amortized Cost and Fair Value      
Available for Sale, Amortized Cost, Within 1 year 996    
Available for Sale, Fair Value, Within 1 year 1,005    
Available for Sale, Amortized Cost, 1 to 5 years 85,059    
Available for Sale, Fair Value, 1 to 5 years 86,361    
Available for Sale, Amortized Cost, 5 to 10 years 290,784    
Available for Sale, Fair Value, 5 to 10 years 290,470    
Available for Sale, Amortized Cost, More than 10 years 62,956    
Available for Sale, Fair Value, More than 10 years 63,279    
Held to Maturity - Amortized Cost and Fair Value      
Held to Maturity, Amortized Cost, Within 1 year       
Held to Maturity, Fair Value, Within 1 year       
Held to Maturity, Amortized Cost, 1 to 5 years 9,858    
Held to Maturity, Fair Value, 1 to 5 years 10,672    
Held to Maturity, Amortized Cost, 5 to 10 years 26,481    
Held to Maturity, Fair Value, 5 to 10 years 29,490    
Held to Maturity, Amortized Cost, More than 10 years 15,429    
Held to Maturity, Fair Value, More than 10 years 17,269    
Mortgage-backed securities
      
Available for Sale - Amortized Cost and Fair Value      
Available for Sale, Amortized Cost 1,450,645    
Fair value 1,468,311    
Held to Maturity - Amortized Cost and Fair Value      
Held to Maturity, Amortized Cost 179,319 [1] 192,404 [1] 251,743 [1]
Fair value $ 189,656 [1] $ 203,865 [1] $ 262,184 [1]
[1] All are residential type mortgage-backed securities