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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 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, 2012
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Impaired Loans [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Covered Real Estate Owned [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Total [Member]
Real Estate Held for Sale [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Impaired Loans [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Covered Real Estate Owned [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 1 [Member]
Real Estate Held for Sale [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Impaired Loans [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Covered Real Estate Owned [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 2 [Member]
Real Estate Held for Sale [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Impaired Loans [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Covered Real Estate Owned [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Real Estate Held for Sale [Member]
Mar. 31, 2013
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2013
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mar. 31, 2013
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mar. 31, 2013
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2013
Obligations of U.S. Government [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2013
Obligations of U.S. Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mar. 31, 2013
Obligations of U.S. Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mar. 31, 2013
Obligations of U.S. Government [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2013
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2013
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mar. 31, 2013
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mar. 31, 2013
Obligations of States and Political Subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2013
Obligations of Foreign Governments [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2013
Obligations of Foreign Governments [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mar. 31, 2013
Obligations of Foreign Governments [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mar. 31, 2013
Obligations of Foreign Governments [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mar. 31, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mar. 31, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2013
Collateralized Mortgage Backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2013
Mortgage-backed Securities, Agency Pass-Through Certificates [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2013
Mortgage-backed Securities, Agency Pass-Through Certificates [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mar. 31, 2013
Mortgage-backed Securities, Agency Pass-Through Certificates [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mar. 31, 2013
Mortgage-backed Securities, Agency Pass-Through Certificates [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2013
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value Total [Member]
Mar. 31, 2013
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mar. 31, 2013
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mar. 31, 2013
Other Debt Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mar. 31, 2013
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, 2013
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, 2013
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, 2013
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         $ 2,022,668 $ 0 $ 2,022,668 $ 0                                 $ 531 $ 0 $ 531 $ 0 $ 489,523 $ 0 $ 489,523 $ 0 $ 24,803 $ 0 $ 24,803 $ 0 $ 0 $ 0 $ 0 $ 0 $ 404,112 $ 0 $ 404,112 $ 0 $ 0 $ 1,103,699 $ 0 $ 1,103,699 $ 0 $ 0 $ 0 $ 0 $ 0                
Assets                 114,023 45,966 [1] 13,988 [2] 54,069 [2] 0 0 [1] 0 [2] 0 [2] 0 0 [1] 0 [2] 0 [2] 114,023 45,966 [1] 13,988 [2] 54,069 [2]                                                                          
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis                                                                                                           7,994 25,434 1,225 [1] 11,038 [1] 281 [2] 372 [2] 6,488 [2] 14,024 [2]
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                                                                                                                    
[1] The losses represents remeasurements of collateral-dependent loans.
[2] The losses represents aggregate writedowns and charge-offs on real estate held for sale.