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Securities Available for Sale and Held to Maturity (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Available for sale securities [Abstract]    
Amortized cost $ 3,471,284 $ 2,584,976
Gross unrealized gains 76,385 72,980
Gross unrealized (losses) (1,586) (211)
Estimated fair value 3,546,083 2,657,745
Held to maturity securities [Abstract]    
Amortized cost 73,666 42,188
Gross unrealized gains 4,522 4,700
Gross unrealized (losses) (92) 0
Estimated fair value 78,096 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 33,071 36,206
Gross unrealized gains 4,058 4,184
Gross unrealized (losses) 0 0
Estimated fair value 37,129 40,390
Residential Mortgage Pass Through Securities Guaranteed by GNMA [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 2,932 3,245
Gross unrealized gains 207 227
Gross unrealized (losses) 0 0
Estimated fair value 3,139 3,472
Residential Mortgage Pass Through Securities Issued by FNMA and FHLMC [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 569 572
Gross unrealized gains 49 52
Gross unrealized (losses) 0 0
Estimated fair value 618 624
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 37,094 2,165
Gross unrealized gains 208 237
Gross unrealized (losses) (92) 0
Estimated fair value 37,210 2,402
Asset-backed Securities [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 506  
Gross unrealized gains 0  
Gross unrealized (losses) 0  
Estimated fair value 506  
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
   
Available for sale securities [Abstract]    
Amortized cost 138,449 10
Gross unrealized gains 2,896 0
Gross unrealized (losses) (119) 0
Estimated fair value 141,226 10
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
   
Available for sale securities [Abstract]    
Amortized cost 185,541 105,396
Gross unrealized gains 938 339
Gross unrealized (losses) (186) 0
Estimated fair value 186,293 105,735
Obligations of States and Political Subdivisions [Member]
   
Available for sale securities [Abstract]    
Amortized cost 206,189 202,877
Gross unrealized gains 12,295 12,900
Gross unrealized (losses) (17) (16)
Estimated fair value 218,467 215,761
Residential Mortgage Pass Through Securities Guaranteed by GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 50,560 18,981
Gross unrealized gains 768 921
Gross unrealized (losses) (190) 0
Estimated fair value 51,138 19,902
Residential Mortgage Pass Through Securities Issued by FNMA and FHLMC [Member]
   
Available for sale securities [Abstract]    
Amortized cost 234,806 201,493
Gross unrealized gains 6,577 7,071
Gross unrealized (losses) (18) 0
Estimated fair value 241,365 208,564
Other Residential Mortgage Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 2,059,567 1,436,812
Gross unrealized gains 31,724 29,574
Gross unrealized (losses) (775) (20)
Estimated fair value 2,090,516 1,466,366
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 359,650 380,514
Gross unrealized gains 17,701 19,420
Gross unrealized (losses) (281) (154)
Estimated fair value 377,070 399,780
Asset-backed Securities [Member]
   
Available for sale securities [Abstract]    
Amortized cost 236,016 238,893
Gross unrealized gains 3,486 2,755
Gross unrealized (losses) 0 (21)
Estimated fair value $ 239,502 $ 241,627