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Fair Value Measurements (Details) (USD $)
3 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2014
Sep. 30, 2013
Mar. 31, 2014
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2014
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2014
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2014
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Impaired Loans [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Impaired Loans [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Impaired Loans [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Impaired Loans [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Impaired Loans [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Impaired Loans [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Impaired Loans [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Impaired Loans [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2013
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 2 [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2014
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Sep. 30, 2013
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2014
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2014
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2013
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2014
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2014
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Sep. 30, 2013
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2014
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2014
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2013
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2014
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
US Treasury and Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2014
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Sep. 30, 2013
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2014
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2014
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2013
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2014
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2014
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2014
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2014
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2014
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2014
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2014
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Sep. 30, 2013
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2014
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2014
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Sep. 30, 2013
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2014
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2014
Other Commercial Mortgage-Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2014
Other Commercial Mortgage-Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Mar. 31, 2014
Other Commercial Mortgage-Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2014
Other Commercial Mortgage-Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Mar. 31, 2014
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2013
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2014
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2013
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Mar. 31, 2014
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Impaired Loans [Member]
Mar. 31, 2013
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Impaired Loans [Member]
Mar. 31, 2014
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Impaired Loans [Member]
Mar. 31, 2013
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Impaired Loans [Member]
Mar. 31, 2014
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2013
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2014
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2013
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Covered Real Estate Owned [Member]
Mar. 31, 2014
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2013
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2014
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2013
Change During Period, Fair Value Disclosure [Member]
Fair Value, Measurements, Nonrecurring [Member]
Real Estate Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                                                                                                                                
Available-for-sale securities, at fair value   $ 3,110,575,000 $ 2,360,948,000 $ 3,110,575,000 $ 2,360,948,000 $ 101,496,000 $ 101,237,000 $ 0 $ 0 $ 3,009,079,000 $ 2,259,711,000                                                                 $ 101,496,000 $ 101,237,000 $ 101,496,000 $ 101,237,000 $ 0 $ 0 $ 0 $ 0 $ 782,257,000 $ 533,975,000 $ 0 $ 0 $ 0 $ 0 $ 782,257,000 $ 533,975,000 $ 22,912,000 $ 22,545,000 $ 0 $ 0 $ 0 $ 0 $ 22,912,000 $ 22,545,000 $ 434,570,000 $ 452,015,000 $ 0 $ 0 $ 0 $ 0 $ 434,570,000 $ 452,015,000 $ 0 $ 1,709,873,000 $ 1,251,176,000 $ 0 $ 0 $ 0 $ 0 $ 1,709,873,000 $ 1,251,176,000 $ 59,467,000 $ 0 $ 0 $ 59,467,000                                
Assets                       36,551,000 114,023,000 7,066,000 45,966,000 2,760,000 13,988,000 26,725,000 54,069,000 0 0 0 0 0 0 0 0 36,551,000 114,023,000 7,066,000 45,966,000 2,760,000 13,988,000 26,725,000 54,069,000 0 0 0 0 0 0 0 0                                                                                                                          
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis                                                                                                                                                                                 2,990,000 7,994,000 5,975,000 25,434,000 269,000 1,225,000 (536,000) 11,038,000 64,000 281,000 129,000 372,000 2,657,000 6,488,000 6,382,000 14,024,000
Liabilities, Fair Value Disclosure, Recurring 0                                                                                                                                                                                                              
Liabilities, Fair Value Disclosure, Nonrecurring   0                                                                                                                                                                                                            
Gain on sale of investments $ 0