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Note G - Fair Value Measurements (Details) (USD $)
In Thousands
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2011
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2011
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2011
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2011
Equity Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2010
Equity Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2011
Equity Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2010
Equity Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2011
US Treasury and Government [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2010
US Treasury and Government [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2011
US Treasury and Government [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2010
US Treasury and Government [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2011
US States and Political Subdivisions Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2010
US States and Political Subdivisions Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2011
US States and Political Subdivisions Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2010
US States and Political Subdivisions Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2011
Foreign Government Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2010
Foreign Government Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2011
Foreign Government Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2010
Foreign Government Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2011
Corporate Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2010
Corporate Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2011
Corporate Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2010
Corporate Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2010
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2010
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2011
Other Debt Obligations [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2010
Other Debt Obligations [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2011
Other Debt Obligations [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2010
Other Debt Obligations [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired Loans [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Impaired Loans [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Impaired Loans [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Impaired Loans [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Impaired Loans [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Impaired Loans [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2011
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2010
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2011
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2010
Portion at Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                                                                                    
Available-for-sale Securities, Fair Value Disclosure $ 520 $ 0 $ 520 $ 0 $ 520 $ 0 $ 520 $ 0 $ 275,625 $ 0 $ 275,625 $ 0 $ 275,625 $ 341,006 $ 275,625 $ 341,006 $ 21,969 $ 0 $ 21,969 $ 0 $ 21,969 $ 0 $ 21,969 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 10,811 $ 0 $ 10,811 $ 0 $ 10,811 $ 10,000 $ 10,811 $ 10,000 $ 2,817,485 $ 0 $ 2,817,485 $ 0 $ 2,817,485 $ 2,130,087 $ 2,817,485 $ 2,130,087 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 3,126,410 $ 0 $ 3,126,410 $ 0                                     $ 3,126,410 $ 2,481,093 $ 3,126,410 $ 2,481,093
Assets, Fair Value Disclosure, Nonrecurring                                                                                                                         319,799 199,547 [1] 120,252 [2] 0 0 [1] 0 [2] 0 0 [1] 0 [2] 319,799 199,547 [1] 120,252 [2]                    
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis                                                                                                                                                 $ 15,605 $ 70,254 $ 6,586 [1] $ 35,890 [1] $ 9,019 [2] $ 34,364 [2]        
[1] The losses represents remeasurements of collateral dependent loans
[2] The losses represents aggregate writedowns and charge-offs on real estate held for sale