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Fair Value Measurements - Recurring and Nonrecurring (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 2,756,906,000us-gaap_AvailableForSaleSecurities		$ 2,756,906,000us-gaap_AvailableForSaleSecurities		$ 3,049,442,000us-gaap_AvailableForSaleSecurities
Bank owned life insurance	100,961,000us-gaap_BankOwnedLifeInsurance		100,961,000us-gaap_BankOwnedLifeInsurance		0us-gaap_BankOwnedLifeInsurance
Total financial assets	4,237,383,000us-gaap_InvestmentsFairValueDisclosure		4,237,383,000us-gaap_InvestmentsFairValueDisclosure		4,548,660,000us-gaap_InvestmentsFairValueDisclosure
Fair value disclosure, recurring		0		0
Fair value disclosure, nonrecurring	0	0	0	0
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Bank owned life insurance	100,961,000		100,961,000		0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FDIC liability	29,825,000		29,825,000		28,823,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	2,756,906,000		2,756,906,000
Bank owned life insurance	100,961,000		100,961,000
Total financial assets	2,857,867,000		2,857,867,000		3,049,442,000
FDIC liability	29,825,000		29,825,000		28,823,000
Long term borrowing hedge	(9,503,000)		(9,503,000)		(268,000)
Total financial liabilities	20,322,000		20,322,000		28,555,000
Level 1 to level 2 transfers, amount	0		0		0
Level 2 to level 1 transfers, amount	0		0		0
Level 1 to level 3 transfers, amount	0		0		0
Level 3 to level 1 transfers, amount	0		0		0
Level 2 to level 3 transfers, amount	0		0		0
Level 3 to level 2 transfers, amount	0		0		0
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, at fair value	102,277,000		102,277,000
Bank owned life insurance	0		0
Total financial assets	102,277,000		102,277,000		101,387,000
FDIC liability	0		0		0
Long term borrowing hedge	0		0		0
Total financial liabilities	0		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, at fair value	2,654,629,000		2,654,629,000
Bank owned life insurance	100,961,000		100,961,000
Total financial assets	2,755,590,000		2,755,590,000		2,948,055,000
FDIC liability	29,825,000		29,825,000		28,823,000
Long term borrowing hedge	(9,503,000)		(9,503,000)		(268,000)
Total financial liabilities	20,322,000		20,322,000		28,555,000
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, at fair value	0		0
Bank owned life insurance	0		0
Total financial assets	0		0		0
FDIC liability	0		0		0
Long term borrowing hedge	0		0		0
Total financial liabilities	0		0		0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	51,733,000	36,551,000	51,733,000	36,551,000
Fair Value, Measurements, Nonrecurring [Member] \| Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	3,478,000	7,066,000	3,478,000	7,066,000
Fair Value, Measurements, Nonrecurring [Member] \| Covered Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,558,000	2,760,000	1,558,000	2,760,000
Fair Value, Measurements, Nonrecurring [Member] \| Real Estate Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	46,697,000	26,725,000	46,697,000	26,725,000
Fair Value, Measurements, Nonrecurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0	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	0	0	0
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	0	0	0
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	0	0	0
Fair Value, Measurements, Nonrecurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0	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	0	0	0
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	0	0	0
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	0	0	0
Fair Value, Measurements, Nonrecurring [Member] \| Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	51,733,000	36,551,000	51,733,000	36,551,000
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	3,478,000	7,066,000	3,478,000	7,066,000
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	1,558,000	2,760,000	1,558,000	2,760,000
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	46,697,000	26,725,000	46,697,000	26,725,000
Equity Securities [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	102,277,000		102,277,000		101,387,000
Equity Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	102,277,000		102,277,000		101,387,000
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, at fair value	102,277,000		102,277,000		101,387,000
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, at fair value	0		0		0
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, at fair value	0		0		0
US Treasury and Government [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	534,445,000		534,445,000		731,943,000
US Treasury and Government [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	534,445,000		534,445,000		731,943,000
US Treasury and 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, at fair value	0		0		0
US Treasury and 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, at fair value	534,445,000		534,445,000		731,943,000
US Treasury and 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, at fair value	0		0		0
Obligations of States and Political Subdivisions [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	24,013,000		24,013,000		23,681,000
Obligations of States and Political Subdivisions [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	24,013,000		24,013,000		23,681,000
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, at fair value	0		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, at fair value	24,013,000		24,013,000		23,681,000
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, at fair value	0		0		0
Foreign Government Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value		0		0
Foreign Government 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, at fair value		0		0
Foreign Government 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, at fair value		0		0
Foreign Government 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, at fair value		0		0
Corporate Debt Securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	528,564,000		528,564,000		509,007,000
Corporate Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	528,564,000		528,564,000		509,007,000
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, at fair value	0		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, at fair value	528,564,000		528,564,000		509,007,000
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, at fair value	0		0		0
Agency Pass-through Certificates [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	1,456,945,000		1,456,945,000		1,584,508,000
Agency Pass-through Certificates [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	1,456,945,000		1,456,945,000		1,584,508,000
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, at fair value	0		0		0
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, at fair value	1,456,945,000		1,456,945,000		1,584,508,000
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, at fair value	0		0		0
Other Commercial Mortgage-Backed Securities [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	110,662,000		110,662,000		98,916,000
Other Commercial Mortgage-Backed Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	110,662,000		110,662,000
Other Commercial Mortgage-Backed 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, at fair value	0		0
Other Commercial Mortgage-Backed 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, at fair value	110,662,000		110,662,000
Other Commercial 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, at fair value	0		0
Commercial Mortgage Backed Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value					98,916,000
Commercial Mortgage Backed 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, at fair value					0
Commercial Mortgage Backed 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, at fair value					98,916,000
Commercial 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, at fair value					0
Changes Measurement [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	(2,018,000)	2,990,000	(10,189,000)	5,975,000
Changes Measurement [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	515,000	269,000	580,000	(536,000)
Changes Measurement [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	112,000	64,000	188,000	129,000
Changes Measurement [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	$ (2,645,000)	$ 2,657,000	$ (10,957,000)	$ 6,382,000