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Summary of Marketable Securities Including Accrued Interest Receivable (Detail) (USD $)
In Thousands
Sep. 30, 2011
Sep. 30, 2010
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost$ 147,177$ 82,351
Gross Unrealized Gains102271
Gross Unrealized Losses(294)(18)
Fair Value146,98582,604
U.S. Treasury securities and obligations of U.S. government agencies
  
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost53,34238,319
Gross Unrealized Gains1762
Gross Unrealized Losses(21)(8)
Fair Value53,33838,373
Corporate securities
  
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost66,04538,617
Gross Unrealized Gains50185
Gross Unrealized Losses(203)(4)
Fair Value65,89238,798
Mortgage-backed securities
  
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost786[1]1,771[2]
Gross Unrealized Gains26[1]23[2]
Gross Unrealized Losses(3)[1](4)[2]
Fair Value809[1]1,790[2]
Other debt securities
  
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost434186
Fair Value434186
Municipal securities
  
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost24,9152,405
Gross Unrealized Gains91
Gross Unrealized Losses(67)(2)
Fair Value24,8572,404
Bank certificate of deposits
  
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost1,6551,053
Fair Value$ 1,655$ 1,053
[1]Fair value amounts include approximately $0.7 million of investments in the Federal Home Loan Mortgage and Federal National Mortgage Association.
[2]Fair value amounts include approximately $0.8 million of investments in the Federal Home Loan Mortgage and Federal National Mortgage Association.