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Securities Available for Sale and Held to Maturity (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Available for sale securities [Abstract]     
Amortized cost$ 2,396,124 $ 2,396,124 $ 2,143,074
Gross unrealized gains80,860 80,860 50,079
Gross unrealized (losses)(79) (79) (15,904)
Estimated fair value2,476,905 2,476,905 2,177,249
Held to maturity securities [Abstract]     
Amortized cost71,046 71,046 140,847
Gross unrealized gains4,965 4,965 4,308
Gross unrealized (losses)(4) (4) (12)
Estimated fair value76,007 76,007 145,143
Fair value [Abstract]     
Estimated fair value, less than 12 months13,432 13,432 718,579
Estimated fair value, 12 months or more300 300 307
Total estimated fair value13,732 13,732 718,886
Gross unrealized losses [Abstract]     
Gross unrealized (losses), less than 12 months(72) (72) (15,911)
Gross unrealized (losses), 12 months or more(11) (11) (5)
Total gross unrealized (losses)(83) (83) (15,916)
Gain (Loss) on Investments [Line Items]     
Proceeds from sales of securities  22,99665,074 
Gross realized gains334912,228 
Available for Sale, amortized cost [Abstract]     
Due in one year or less45,283 45,283  
Due after one year through five years50,639 50,639  
Due after five years through ten years153,247 153,247  
Due after ten years11,295 11,295  
Total amortized cost, before mortgage-backed-securities260,464 260,464  
Mortgage-backed securities2,135,660 2,135,660  
Total amortized cost2,396,124 2,396,124  
Available for Sale, estimated fair value [Abstract]     
Due in one year or less45,322 45,322  
Due after one year through five years52,721 52,721  
Due after five years through ten years159,940 159,940  
Due after ten years11,673 11,673  
Total fair value, before mortgage-backed-securities269,656 269,656  
Mortgage-backed securities2,207,249 2,207,249  
Securities available for sale (at fair value)2,476,905 2,476,905 2,177,249
Held to maturity, amortized cost [Abstract]     
Due in one year or less2,653 2,653  
Due after one year through five years12,919 12,919  
Due after five years through ten years19,809 19,809  
Due after ten years7,865 7,865  
Total amortized cost, before mortgage-backed-securities43,246 43,246  
Mortgage-backed securities27,800 27,800  
Securities held to maturity71,046 71,046 140,847
Held to maturity, estimated fair value [Abstract]     
Due in one year or less2,680 2,680  
Due after one year through five years13,498 13,498  
Due after five years through ten years21,992 21,992  
Due after ten years9,169 9,169  
Total fair value, before mortgage-backed-securities47,339 47,339  
Mortgage-backed securities28,668 28,668  
Securities held to maturity (at fair value)76,007 76,007  
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
     
Held to maturity securities [Abstract]     
Amortized cost0 0 0
Gross unrealized gains0 0 0
Gross unrealized (losses)0 0 0
Estimated fair value0 0 0
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
     
Available for sale securities [Abstract]     
Amortized cost5 5 12
Gross unrealized gains0 0 0
Gross unrealized (losses)0 0 0
Estimated fair value5 5 12
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
     
Held to maturity securities [Abstract]     
Amortized cost0 0 0
Gross unrealized gains0 0 0
Gross unrealized (losses)0 0 0
Estimated fair value0 0 0
Fair value [Abstract]     
Estimated fair value, less than 12 months9,957 9,957 86,917
Estimated fair value, 12 months or more0 0 0
Total estimated fair value9,957 9,957 86,917
Gross unrealized losses [Abstract]     
Gross unrealized (losses), less than 12 months(38) (38) (2,184)
Gross unrealized (losses), 12 months or more0 0 0
Total gross unrealized (losses)(38) (38) (2,184)
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
     
Available for sale securities [Abstract]     
Amortized cost61,599 61,599 124,093
Gross unrealized gains309 309 114
Gross unrealized (losses)(38) (38) (2,184)
Estimated fair value61,870 61,870 122,023
Obligations of States and Political Subdivisions [Member]
     
Held to maturity securities [Abstract]     
Amortized cost43,246 43,246 53,246
Gross unrealized gains4,097 4,097 2,628
Gross unrealized (losses)(4) (4) (10)
Estimated fair value47,339 47,339 55,864
Fair value [Abstract]     
Estimated fair value, less than 12 months3,475 3,475 65,523
Estimated fair value, 12 months or more300 300 307
Total estimated fair value3,775 3,775 65,830
Gross unrealized losses [Abstract]     
Gross unrealized (losses), less than 12 months(34) (34) (2,045)
Gross unrealized (losses), 12 months or more(11) (11) (5)
Total gross unrealized (losses)(45) (45) (2,050)
Obligations of States and Political Subdivisions [Member]
     
Available for sale securities [Abstract]     
Amortized cost198,860 198,860 159,418
Gross unrealized gains8,962 8,962 2,259
Gross unrealized (losses)(41) (41) (2,040)
Estimated fair value207,781 207,781 159,637
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
     
Held to maturity securities [Abstract]     
Amortized cost5,291 5,291 6,058
Gross unrealized gains353 353 171
Gross unrealized (losses)0 0 0
Estimated fair value5,644 5,644 6,229
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
     
Available for sale securities [Abstract]     
Amortized cost13,650 13,650 11,719
Gross unrealized gains987 987 723
Gross unrealized (losses)0 0 0
Estimated fair value14,637 14,637 12,442
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
     
Held to maturity securities [Abstract]     
Amortized cost753 753 763
Gross unrealized gains34 34 6
Gross unrealized (losses)0 0 0
Estimated fair value787 787 769
Fair value [Abstract]     
Estimated fair value, less than 12 months    312,787
Estimated fair value, 12 months or more    0
Total estimated fair value    312,787
Gross unrealized losses [Abstract]     
Gross unrealized (losses), less than 12 months    (6,846)
Gross unrealized (losses), 12 months or more    0
Total gross unrealized (losses)    (6,846)
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
     
Available for sale securities [Abstract]     
Amortized cost392,598 392,598 432,162
Gross unrealized gains7,991 7,991 1,188
Gross unrealized (losses)0 0 (6,846)
Estimated fair value400,589 400,589 426,504
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
     
Held to maturity securities [Abstract]     
Amortized cost19,534 19,534 78,526
Gross unrealized gains307 307 1,503
Gross unrealized (losses)0 0 0
Estimated fair value19,841 19,841 80,029
Fair value [Abstract]     
Estimated fair value, less than 12 months    232,279
Estimated fair value, 12 months or more    0
Total estimated fair value    232,279
Gross unrealized losses [Abstract]     
Gross unrealized (losses), less than 12 months    (4,311)
Gross unrealized (losses), 12 months or more    0
Total gross unrealized (losses)    (4,311)
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
     
Available for sale securities [Abstract]     
Amortized cost1,524,422 1,524,422 1,361,339
Gross unrealized gains55,276 55,276 43,788
Gross unrealized (losses)0 0 (4,311)
Estimated fair value1,579,698 1,579,698 1,400,816
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
     
Held to maturity securities [Abstract]     
Amortized cost2,222 2,222 2,254
Gross unrealized gains174 174 0
Gross unrealized (losses)0 0 (2)
Estimated fair value2,396 2,396 2,252
Fair value [Abstract]     
Estimated fair value, less than 12 months    21,073
Estimated fair value, 12 months or more    0
Total estimated fair value    21,073
Gross unrealized losses [Abstract]     
Gross unrealized (losses), less than 12 months    (525)
Gross unrealized (losses), 12 months or more    0
Total gross unrealized (losses)    (525)
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
     
Available for sale securities [Abstract]     
Amortized cost204,990 204,990 54,331
Gross unrealized gains7,335 7,335 2,007
Gross unrealized (losses)0 0 (523)
Estimated fair value212,325 212,325 55,815
Available-for-sale Securities [Member]
     
Gain (Loss) on Investments [Line Items]     
Proceeds from sales of securities1,175024,17165,074 
Gross realized gains50572,216 
Held-to-maturity Securities [Member]
     
Gain (Loss) on Investments [Line Items]     
Proceeds from calls of securities2,3551,2103,6454,960 
Gross realized gains$ 28$ 4$ 34$ 12