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Securities Available for Sale and Held to Maturity (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Available for sale securities [Abstract]    
Amortized cost $ 3,397,840 $ 2,584,976
Gross unrealized gains 38,984 72,980
Gross unrealized (losses) (64,723) (211)
Estimated fair value 3,372,101 2,657,745
Held to maturity securities [Abstract]    
Amortized cost 69,980 42,188
Gross unrealized gains 3,281 4,700
Gross unrealized (losses) (2,312) 0
Estimated fair value 70,949 46,888
US Treasury 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]
   
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 30,229 36,206
Gross unrealized gains 2,974 4,184
Gross unrealized (losses) 0 0
Estimated fair value 33,203 40,390
Residential Mortgage Pass Through Securities Guaranteed by GNMA [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 2,420 3,245
Gross unrealized gains 158 227
Gross unrealized (losses) 0 0
Estimated fair value 2,578 3,472
Residential Mortgage Pass Through Securities Issued by FNMA and FHLMC [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 564 572
Gross unrealized gains 35 52
Gross unrealized (losses) 0 0
Estimated fair value 599 624
Other Residential Mortgage Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [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
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 36,767 2,165
Gross unrealized gains 114 237
Gross unrealized (losses) (2,312) 0
Estimated fair value 34,569 2,402
Asset-Backed Securities and Structured Financial Products [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
US Treasury Securities [Member]
   
Available for sale securities [Abstract]    
Amortized cost 503  
Gross unrealized gains 0  
Gross unrealized (losses) 0  
Estimated fair value 503  
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
   
Available for sale securities [Abstract]    
Amortized cost 133,258 10
Gross unrealized gains 1,125 0
Gross unrealized (losses) (1,370) 0
Estimated fair value 133,013 10
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
   
Available for sale securities [Abstract]    
Amortized cost 138,937 105,396
Gross unrealized gains 24 339
Gross unrealized (losses) (6,536) 0
Estimated fair value 132,425 105,735
Obligations of States and Political Subdivisions [Member]
   
Available for sale securities [Abstract]    
Amortized cost 206,168 202,877
Gross unrealized gains 7,460 12,900
Gross unrealized (losses) (637) (16)
Estimated fair value 212,991 215,761
Residential Mortgage Pass Through Securities Guaranteed by GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 48,737 18,981
Gross unrealized gains 596 921
Gross unrealized (losses) (1,093) 0
Estimated fair value 48,240 19,902
Residential Mortgage Pass Through Securities Issued by FNMA and FHLMC [Member]
   
Available for sale securities [Abstract]    
Amortized cost 211,031 201,493
Gross unrealized gains 4,427 7,071
Gross unrealized (losses) (663) 0
Estimated fair value 214,795 208,564
Other Residential Mortgage Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 2,083,906 1,436,812
Gross unrealized gains 14,665 29,574
Gross unrealized (losses) (50,296) (20)
Estimated fair value 2,048,275 1,466,366
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 349,679 380,514
Gross unrealized gains 8,568 19,420
Gross unrealized (losses) (4,116) (154)
Estimated fair value 354,131 399,780
Asset-Backed Securities and Structured Financial Products [Member]
   
Available for sale securities [Abstract]    
Amortized cost 225,621 238,893
Gross unrealized gains 2,119 2,755
Gross unrealized (losses) (12) (21)
Estimated fair value $ 227,728 $ 241,627