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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Liabilities, Fair Value Disclosure, Recurring $ 0   $ 0  
Liabilities, Fair Value Disclosure, Nonrecurring 0   0  
Gain on sale of investments 0 0 0 0
Term of Contractual Due Dates of Substantially All Mortgage-Backed Securities     10 years  
Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 2,058,144   2,058,144  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 2,058,144   2,058,144  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value Total [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 159,892   159,892  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value Total [Member] | Impaired Loans [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 64,500 [1]   64,500 [1]  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value Total [Member] | Covered Real Estate Owned [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 18,312 [2]   18,312 [2]  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value Total [Member] | Real Estate Held for Sale [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 77,080 [2]   77,080 [2]  
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 0   0  
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Impaired Loans [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 0 [1]   0 [1]  
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Covered Real Estate Owned [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 0 [2]   0 [2]  
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Real Estate Held for Sale [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 0 [2]   0 [2]  
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 0   0  
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Impaired Loans [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 0 [1]   0 [1]  
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Covered Real Estate Owned [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 0 [2]   0 [2]  
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Real Estate Held for Sale [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 0 [2]   0 [2]  
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 159,892   159,892  
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Impaired Loans [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 64,500 [1]   64,500 [1]  
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Covered Real Estate Owned [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 18,312 [2]   18,312 [2]  
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Real Estate Held for Sale [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets 77,080 [2]   77,080 [2]  
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 514   514  
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 514   514  
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Obligations of U.S. Government [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 545,585   545,585  
Obligations of U.S. Government [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Obligations of U.S. Government [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 545,585   545,585  
Obligations of U.S. Government [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 22,545   22,545  
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 22,545   22,545  
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Obligations of Foreign Governments [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Obligations of Foreign Governments [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Obligations of Foreign Governments [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Obligations of Foreign Governments [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 452,111   452,111  
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 452,111   452,111  
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Mortgage-backed Securities, Agency Pass-Through Certificates [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 1,037,389   1,037,389  
Mortgage-backed Securities, Agency Pass-Through Certificates [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Mortgage-backed Securities, Agency Pass-Through Certificates [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 1,037,389   1,037,389  
Mortgage-backed Securities, Agency Pass-Through Certificates [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0   0  
Change During Period, Fair Value Disclosure [Member] | Fair Value, Measurements, Nonrecurring [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis 7,824   33,258  
Change During Period, Fair Value Disclosure [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis 1,967 [1]   13,005 [1]  
Change During Period, Fair Value Disclosure [Member] | Fair Value, Measurements, Nonrecurring [Member] | Covered Real Estate Owned [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis 231 [2]   603 [2]  
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]        
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis $ 5,626 [2]   $ 19,650 [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.