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Securities Available for Sale and Held to Maturity (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available for sale securities [Abstract]    
Amortized cost $ 2,648,786 $ 2,395,263
Gross unrealized gains 75,871 73,918
Gross unrealized (losses) (211) (188)
Estimated fair value 2,724,446 2,468,993
Held to maturity securities [Abstract]    
Amortized cost 45,484 57,705
Gross unrealized gains 4,791 4,813
Gross unrealized (losses) (3) (3)
Estimated fair value 50,272 62,515
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 0 0
Gross unrealized gains 0 0
Gross unrealized (losses) 0 0
Estimated fair value 0 0
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 0 0
Gross unrealized gains 0 0
Gross unrealized (losses) 0 0
Estimated fair value 0 0
Obligations of States and Political Subdivisions [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 37,669 42,619
Gross unrealized gains 4,226 4,131
Gross unrealized (losses) (3) (2)
Estimated fair value 41,892 46,748
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 3,435 4,538
Gross unrealized gains 257 336
Gross unrealized (losses) 0 0
Estimated fair value 3,692 4,874
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 580 588
Gross unrealized gains 48 28
Gross unrealized (losses) 0 0
Estimated fair value 628 616
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 1,624 7,749
Gross unrealized gains 8 133
Gross unrealized (losses) 0 (1)
Estimated fair value 1,632 7,881
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 2,176 2,211
Gross unrealized gains 252 185
Gross unrealized (losses) 0 0
Estimated fair value 2,428 2,396
Asset-backed Securities [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 0  
Gross unrealized gains 0  
Gross unrealized (losses) 0  
Estimated fair value 0  
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
   
Available for sale securities [Abstract]    
Amortized cost 18 3
Gross unrealized gains 0 0
Gross unrealized (losses) 0 0
Estimated fair value 18 3
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
   
Available for sale securities [Abstract]    
Amortized cost 60,290 64,573
Gross unrealized gains 381 229
Gross unrealized (losses) 0 0
Estimated fair value 60,671 64,802
Obligations of States and Political Subdivisions [Member]
   
Available for sale securities [Abstract]    
Amortized cost 202,133 190,868
Gross unrealized gains 13,772 11,971
Gross unrealized (losses) (5) (12)
Estimated fair value 215,900 202,827
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 20,306 11,500
Gross unrealized gains 1,046 945
Gross unrealized (losses) 0 0
Estimated fair value 21,352 12,445
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
   
Available for sale securities [Abstract]    
Amortized cost 229,195 340,839
Gross unrealized gains 8,691 7,093
Gross unrealized (losses) 0 0
Estimated fair value 237,886 347,932
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 1,535,208 1,570,782
Gross unrealized gains 30,101 44,183
Gross unrealized (losses) (19) 0
Estimated fair value 1,565,290 1,614,965
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 361,843 216,698
Gross unrealized gains 19,528 9,497
Gross unrealized (losses) (164) (176)
Estimated fair value 381,207 226,019
Asset-backed Securities / structured financial products [Member]
   
Available for sale securities [Abstract]    
Amortized cost 239,793  
Gross unrealized gains 2,352  
Gross unrealized (losses) (23)  
Estimated fair value $ 242,122