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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) (USD $)
In Thousands
Sep. 30, 2011
Estimated Fair Value, less than 12 months, Available for Sale and Held To Maturity, Combined$ 200,540
Unrealized Losses, less than 12 months, Available for Sale and Held to Maturity, Combined(8,355)
Estimated Fair Value, 12 months or longer, Available for Sale and Held to Maturity, Combined225,203
Unrealized Losses, 12 months or longer, Available for Sale and Held to Maturity, Combined(25,448)
Estimated Fair Value, Total425,743
Unrealized Losses, Total(33,803)
U.S. Government-Sponsored Agency Securities [Member]
 
Estimated Fair Value, less than 12 months, Available for Sale and Held To Maturity, Combined5,401
Unrealized Losses, less than 12 months, Available for Sale and Held to Maturity, Combined(7)
Estimated Fair Value, 12 months or longer, Available for Sale and Held to Maturity, Combined175
Unrealized Losses, 12 months or longer, Available for Sale and Held to Maturity, Combined(1)
Estimated Fair Value, Total5,576
Unrealized Losses, Total(8)
Corporate Debt Securities [Member]
 
Estimated Fair Value, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value16,909
Unrealized Losses, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses(1,060)
Estimated Fair Value, Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value41,371
Unrealized Losses, Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses,(11,852)
Estimated Fair Value, Total58,280
Unrealized Losses, Total(12,912)
Collateralized Mortgage Obligations [Member]
 
Estimated Fair Value, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value101,324
Unrealized Losses, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses(353)
Estimated Fair Value, Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value0
Unrealized Losses, Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses,0
Estimated Fair Value, Total101,324
Unrealized Losses, Total(353)
Mortgage-Backed Securities [Member]
 
Estimated Fair Value, less than 12 months, Available for Sale and Held To Maturity, Combined26,100
Unrealized Losses, less than 12 months, Available for Sale and Held to Maturity, Combined(69)
Estimated Fair Value, 12 months or longer, Available for Sale and Held to Maturity, Combined0
Unrealized Losses, 12 months or longer, Available for Sale and Held to Maturity, Combined0
Estimated Fair Value, Total26,100
Unrealized Losses, Total(69)
Auction Rate Securities [Member]
 
Estimated Fair Value, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value37,059
Unrealized Losses, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses(1,915)
Estimated Fair Value, Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value182,341
Unrealized Losses, Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses,(13,138)
Estimated Fair Value, Total219,400
Unrealized Losses, Total(15,053)
Debt Securities [Member]
 
Estimated Fair Value, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value186,793
Unrealized Losses, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses(3,404)
Estimated Fair Value, Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value223,887
Unrealized Losses, Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses,(24,991)
Estimated Fair Value, Total410,680
Unrealized Losses, Total(28,395)
Equity Securities [Member]
 
Estimated Fair Value, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value13,747
Unrealized Losses, Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses(4,951)
Estimated Fair Value, Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value1,316
Unrealized Losses, Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses,(457)
Estimated Fair Value, Total15,063
Unrealized Losses, Total$ (5,408)