Selected Financial Data for Transition Periods (Detail) (USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Sep. 30, 2010
Proceeds from Operating Activities						$ 3,800,000
Net Cash Provided by (Used in) Operating Activities	3,052,000	[1]	18,110,000	[1]	64,845,000	3,100,000	104,171,000	47,897,000
Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Period Increase (Decrease)						4,100,000
Proceeds from Sale of Other Real Estate	6,345,000	[1]	2,018,000	[1]	31,394,000	300,000	17,223,000	20,281,000
Net Cash Provided by (Used in) Investing Activities	49,948,000	[1]	(4,142,000)	[1]	514,351,000	3,800,000	30,346,000	78,355,000
Restatement Adjustment [Member]
Proceeds from Operating Activities						3,800,000
Payments for Operating Activities						(5,100,000)
Net Cash Provided by (Used in) Operating Activities						(700,000)
Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Period Increase (Decrease)						(34,300,000)
Proceeds from Sale of Other Real Estate						6,000,000
Net Cash Provided by (Used in) Investing Activities						$ 53,700,000

[1] Certain amounts have been reclassified from the original presentation in the Consolidated Statement of Cash Flows as reported in the Form 10-Q for the transitional quarter ended December 31, 2011, to conform with current period presentation. Certain amounts have been reclassified to conform to the presentation for the quarter ended December 31, 2011.