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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2011
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2012
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2011
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Impaired Loans [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Impaired Loans [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Covered Real Estate Owned [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Covered Real Estate Owned [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired Loans [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Covered Real Estate Owned [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Impaired Loans [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Covered Real Estate Owned [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Impaired Loans [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Covered Real Estate Owned [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Impaired Loans [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Covered Real Estate Owned [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Real Estate Held for Sale [Member]
Jun. 30, 2012
Equity Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2011
Equity Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2012
Equity Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2011
Equity Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2012
US Treasury and Government [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2011
US Treasury and Government [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2012
US Treasury and Government [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2011
US Treasury and Government [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2012
US States and Political Subdivisions Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2011
US States and Political Subdivisions Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2012
US States and Political Subdivisions Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2011
US States and Political Subdivisions Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2012
Foreign Government Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2011
Foreign Government Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2012
Foreign Government Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2011
Foreign Government Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2012
Corporate Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2011
Corporate Debt Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2012
Corporate Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2011
Corporate Debt Securities [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
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, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2012
Other Debt Obligations [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2011
Other Debt Obligations [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Jun. 30, 2012
Other Debt Obligations [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2011
Other Debt Obligations [Member]
Portion at Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Jun. 30, 2012
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Jun. 30, 2012
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Jun. 30, 2012
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                                                                                                  
Term of Contractual Due Dates of Substantially All Mortgage-Backed Securities 10 years                                                                                                                                                                                
Available-for-sale Securities, Fair Value Disclosure   $ 3,626,115 $ 3,255,144 $ 3,626,115 $ 3,255,144 $ 3,626,115 $ 0 $ 3,626,115 $ 0                                                 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 114,141 $ 190,527 $ 114,141 $ 190,527 $ 114,141 $ 0 $ 114,141 $ 0 $ 24,001 $ 23,568 $ 24,001 $ 23,568 $ 24,001 $ 0 $ 24,001 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 303,214 $ 29,959 $ 303,214 $ 29,959 $ 303,214 $ 0 $ 303,214 $ 0 $ 3,184,759 $ 3,011,090 $ 3,184,759 $ 3,011,090 $ 3,184,759 $ 0 $ 3,184,759 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0
Assets, Fair Value Disclosure, Nonrecurring                                   324,293 133,929 [1] 32,817 [2] 157,547 [2] 0 0 [1] 0 [2] 0 [2] 0 0 [1] 0 [2] 0 [2] 324,293 133,929 [1] 32,817 [2] 157,547 [2]                                                                                                                
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis                   $ 36,138 $ 99,515 $ 13,459 [1] $ 36,291 [1] $ 923 [2] $ 2,124 [2] $ 21,756 [2] $ 61,100 [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.