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Note G - Fair Value Measurements Securities in Unrealized Loss Positions (Details) (USD $)
In Thousands
Jun. 30, 2011
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses $ (21,810)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,041,394
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (21,810)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,041,394
US Government Agencies Debt Securities [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (13,563)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 261,945
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (13,563)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 261,945
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
 
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (8,247)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 779,449
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses (8,247)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 779,449