Loans and Allowance for Loan Losses (Impaired Loans) (Details) (USD $)	3 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired loans, held for sale	$ 0		$ 4,529,000
Impaired loans, not individually reviewed for impairment	6,017,000		5,127,000
Impaired loans, individually reviewed, with no impairment	62,282,000		53,884,000
Impaired loans, individually reviewed, with impairment	15,312,000		42,357,000
Total impaired loans, excluding purchased impaired	83,611,000	[1]	105,897,000	[1]
Purchased impaired loans with subsequent deterioration	192,115,000		0
Purchased impaired loans with no subsequent deterioration	36,277,000		330,836,000
Impaired loan, individually reviewed, with impairment, associated reserves	1,737,000	[1]	11,090,000	[1]
Purchased impaired loans with subsequent deterioration, associated reserves	5,373,000
Impaired financing receivable, including deteriorated loans purchased, related allowance	7,110,000		11,090,000
Imparied financing receivable, simple average balance	94,754,000		112,600,000
Restructured loans	20,800,000		28,300,000
Performing [Member]
Financing Receivable, Impaired [Line Items]
Restructured loans	$ 4,500,000		$ 2,900,000

[1] Included at December 31, 2012 and December 31, 2011 were $4.5 million and $2.9 million, respectively, in restructured and performing loans.