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Securities Available for Sale and Held to Maturity (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Available for sale securities [Abstract]    
Amortized cost $ 3,509,146 $ 2,584,976
Gross unrealized gains 43,636 72,980
Gross unrealized (losses) (41,099) (211)
Estimated fair value 3,511,683 2,657,745
Held to maturity securities [Abstract]    
Amortized cost 70,338 42,188
Gross unrealized gains 3,603 4,700
Gross unrealized (losses) (2,008) 0
Estimated fair value 71,933 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 30,295 36,206
Gross unrealized gains 3,309 4,184
Gross unrealized (losses) 0 0
Estimated fair value 33,604 40,390
Residential Mortgage Pass Through Securities Guaranteed by GNMA [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 2,547 3,245
Gross unrealized gains 139 227
Gross unrealized (losses) 0 0
Estimated fair value 2,686 3,472
Residential Mortgage Pass Through Securities Issued by FNMA and FHLMC [Member]
   
Held to maturity securities [Abstract]    
Amortized cost 567 572
Gross unrealized gains 35 52
Gross unrealized (losses) 0 0
Estimated fair value 602 624
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 36,929 2,165
Gross unrealized gains 120 237
Gross unrealized (losses) (2,008) 0
Estimated fair value 35,041 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 505  
Gross unrealized gains 0  
Gross unrealized (losses) 0  
Estimated fair value 505  
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
   
Available for sale securities [Abstract]    
Amortized cost 136,425 10
Gross unrealized gains 3,380 0
Gross unrealized (losses) (739) 0
Estimated fair value 139,066 10
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
   
Available for sale securities [Abstract]    
Amortized cost 138,915 105,396
Gross unrealized gains 26 339
Gross unrealized (losses) (5,150) 0
Estimated fair value 133,791 105,735
Obligations of States and Political Subdivisions [Member]
   
Available for sale securities [Abstract]    
Amortized cost 205,274 202,877
Gross unrealized gains 7,651 12,900
Gross unrealized (losses) (721) (16)
Estimated fair value 212,204 215,761
Residential Mortgage Pass Through Securities Guaranteed by GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 47,543 18,981
Gross unrealized gains 481 921
Gross unrealized (losses) (1,694) 0
Estimated fair value 46,330 19,902
Residential Mortgage Pass Through Securities Issued by FNMA and FHLMC [Member]
   
Available for sale securities [Abstract]    
Amortized cost 226,655 201,493
Gross unrealized gains 3,023 7,071
Gross unrealized (losses) (1,751) 0
Estimated fair value 227,927 208,564
Other Residential Mortgage Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 2,167,035 1,436,812
Gross unrealized gains 16,587 29,574
Gross unrealized (losses) (27,302) (20)
Estimated fair value 2,156,320 1,466,366
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
   
Available for sale securities [Abstract]    
Amortized cost 356,044 380,514
Gross unrealized gains 9,273 19,420
Gross unrealized (losses) (3,742) (154)
Estimated fair value 361,575 399,780
Asset-backed Securities [Member]
   
Available for sale securities [Abstract]    
Amortized cost 230,750 238,893
Gross unrealized gains 3,215 2,755
Gross unrealized (losses) 0 (21)
Estimated fair value $ 233,965 $ 241,627