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Fair Value Measurements (Summary of Assets And Liabilities Measured At Fair Value on A Recurring Basis) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
U.S. government and federal agency obligations$ 360,102$ 455,537
Government-sponsored enterprise obligations264,550201,895
State and municipal obligations1,259,3841,119,485
Agency mortgage-backed securities4,295,1942,491,199
Non-agency mortgage-backed securities353,229455,790
Other asset-backed securities2,537,2512,354,260
Other debt securities167,633176,964
Equity securities40,72339,173
Trading securities9,69511,710
Private equity investments63,04853,860
Assets: Derivatives*22,277[1]18,823[1]
Assets held in trust4,1684,213
Total assets9,377,2547,382,909
Liabilities: Derivatives*23,484[1]19,584
Total liabilities23,48419,584
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
  
U.S. government and federal agency obligations352,597448,087
Equity securities26,73122,900
Assets held in trust4,1684,213
Total assets383,496475,200
Significant Other Observable Inputs (Level 2) [Member]
  
U.S. government and federal agency obligations7,5057,450
Government-sponsored enterprise obligations264,550201,895
State and municipal obligations1,119,660969,396
Agency mortgage-backed securities4,295,1942,491,199
Non-agency mortgage-backed securities353,229455,790
Other asset-backed securities2,537,2512,354,260
Other debt securities167,633176,964
Equity securities13,99216,273
Trading securities9,69511,710
Assets: Derivatives*21,949[1]18,288[1]
Total assets8,790,6586,703,225
Liabilities: Derivatives*23,252[1]19,401
Total liabilities23,25219,401
Significant Unobservable Inputs (Level 3) [Member]
  
State and municipal obligations139,724150,089
Private equity investments63,04853,860
Assets: Derivatives*328[1]535[1]
Total assets203,100204,484
Liabilities: Derivatives*232[1]183
Total liabilities$ 232$ 183
[1]The fair value of each class of derivative is shown in Note 10.