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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2011
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2011
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Dec. 31, 2011
Portion at Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2011
Portion at Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Impaired Loans [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Covered Real Estate Owned [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Change During Period, Fair Value Disclosure [Member]
Real Estate Held for Sale [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Impaired Loans [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Covered Real Estate Owned [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Real Estate Held for Sale [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Impaired Loans [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Covered Real Estate Owned [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Real Estate Held for Sale [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Impaired Loans [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Covered Real Estate Owned [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Real Estate Held for Sale [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Impaired Loans [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Covered Real Estate Owned [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Real Estate Held for Sale [Member]
Dec. 31, 2011
Equity Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2011
Equity Securities [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Dec. 31, 2011
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]
Dec. 31, 2011
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
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]
Dec. 31, 2011
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]
Dec. 31, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
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]
Dec. 31, 2011
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]
Dec. 31, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
US States and Political Subdivisions Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
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]
Dec. 31, 2011
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]
Dec. 31, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
Foreign Government Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
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]
Dec. 31, 2011
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]
Dec. 31, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
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]
Dec. 31, 2011
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]
Dec. 31, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2011
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]
Dec. 31, 2011
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]
Dec. 31, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2011
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2011
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]                                                                                                                                                                        
Available-for-sale Securities, Fair Value Disclosure $ 3,548,076 $ 3,255,144 $ 3,548,076 $ 3,255,144 $ 3,548,076 $ 0 $ 3,548,076 $ 0                                         $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 151,225 $ 190,527 $ 151,225 $ 190,527 $ 151,225 $ 0 $ 151,225 $ 0 $ 23,710 $ 23,568 $ 23,710 $ 23,568 $ 23,710 $ 0 $ 23,710 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 29,371 $ 29,959 $ 29,371 $ 29,959 $ 29,371 $ 0 $ 29,371 $ 0 $ 3,343,770 $ 3,011,090 $ 3,343,770 $ 3,011,090 $ 3,343,770 $ 0 $ 3,343,770 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0
Assets, Fair Value Disclosure, Nonrecurring                         88,248 13,680 [1] 15,582 [2] 58,986 [2] 0 0 [1] 0 [2] 0 [2] 0 0 [1] 0 [2] 0 [2] 88,248 13,680 [1] 15,582 [2] 58,986 [2]                                                                                                                
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis                 $ 22,666 $ 1,001 [1] $ 701 [2] $ 20,964 [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.