Selected Financial Data for Transition Periods (Detail) - CONSOLIDATED STATEMENTS OF CASH FLOWS (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
Net income	$ 15,572,000		$ 1,167,000		$ 28,813,000		$ (41,186,000)	$ (36,789,000)
Less: Income from discontinued operations	0		(28,000)		0		3,565,000	(2,519,000)
Net income from continuing operations	15,572,000		1,139,000		28,813,000		(37,621,000)	(39,308,000)
Adjustments to reconcile net income to net cash (used in) provided by operating activities
Provision for loan losses	7,445,000		10,483,000
Depreciation	1,365,000		1,347,000
Amortization of intangibles	90,000		82,000		1,325,000		325,000	328,000
Net decrease (increase) in current & deferred income tax	9,620,000		(1,216,000)		25,647,000		(18,682,000)	(26,828,000)
Amortization of mark-to-market adjustments	(4,483,000)		(3,020,000)
Fair value adjustments on other real estate owned	2,487,000		1,309,000
Accretion/amortization of unearned discounts on investments, net	89,000		(721,000)
Other-than-temporary impairment losses on investment securities	180,000		534,000		503,000		879,000	2,853,000
Loans originated for sale	(117,482,000)		(110,455,000)
Proceeds from loans held for sale	111,931,000		112,365,000
Gain on sold loan pool, net	(20,796,000)		0		0		(1,900,000)	0
Gain on sale of loans, net	(1,967,000)		(2,038,000)		(16,322,000)		(2,261,000)	(3,145,000)
Gain on sale of other real estate owned, net	(383,000)		(141,000)		(1,542,000)		(1,049,000)	1,847,000
Recognition of stock-based compensation expense	59,000		179,000		180,000		432,000	(219,000)
Decrease in prepaid FDIC insurance premium	647,000		950,000
FDIC reimbursement of covered asset losses	14,000		0
Other1	(1,336,000)	[1]	6,081,000	[1]
Discontinued operations, net	0		1,232,000		0		28,344,000	4,256,000
Net cash provided by operating activities1	3,052,000	[1]	18,110,000	[1]	64,845,000	3,100,000	104,171,000	47,897,000
Securities available for sale
Proceeds from sales	0		775,000
Proceeds from maturities, calls and payments	23,945,000		38,678,000		97,410,000		114,225,000	160,323,000
Purchases	(25,376,000)		(7,202,000)		(137,753,000)		(121,928,000)	(73,104,000)
Securities held to maturity
Proceeds from maturities, calls and payments	1,200,000		0
Redemption of FHLB stock, net	3,087,000		1,595,000
Increase in loans, net1	(38,450,000)	[1]	(39,119,000)	[1]	141,894,000		(26,847,000)	(25,083,000)
Proceeds from sales of loans, net	80,064,000		0
Proceeds from sales of other real estate owned1	6,345,000	[1]	2,018,000	[1]	31,394,000	300,000	17,223,000	20,281,000
Increase in property and equipment, net	(867,000)		(747,000)
Discontinued operations, net	0		(140,000)		0		456,000	(443,000)
Net cash provided by (used in) investing activities1	49,948,000	[1]	(4,142,000)	[1]	514,351,000	3,800,000	30,346,000	78,355,000
Financing Activities
Increase (decrease) in demand and savings deposits, net	7,126,000		(12,015,000)
(Decrease) increase in time deposits, net	(70,749,000)		6,564,000		(314,591,000)		(215,921,000)	12,433,000
Proceeds (repayments) of FHLB advances, net	3,000,000		(11,000,000)
Dividends paid on preferred stock	(813,000)		(813,000)		(3,250,000)		(3,250,000)	(3,252,000)
Dividends paid on common stock	(826,000)		(826,000)
Net cash used in financing activities	(62,262,000)		(18,090,000)		(538,420,000)		(109,128,000)	(144,016,000)
Net decrease in cash and cash equivalents	(9,262,000)		(4,122,000)		40,776,000		25,389,000	(17,764,000)
Cash and cash equivalents at beginning of period, continuing operations	85,937,000		55,274,000		76,675,000	53,404,000	55,274,000	74,621,000
Cash and cash equivalents at beginning of period, discontinued operations	0		5,274,000		0	3,022,000	5,274,000	3,691,000
Cash and cash equivalents at beginning of period	85,937,000		60,548,000		76,675,000	56,426,000	60,548,000	78,312,000
Cash and cash equivalents at end of period, continuing operations	76,675,000		53,404,000		117,451,000	76,675,000	85,937,000	55,274,000
Cash and cash equivalents at end of period, discontinued operations	0		3,022,000		0	0	0	5,274,000
Cash and cash equivalents at end of period	76,675,000		56,426,000		117,451,000	76,675,000	85,937,000	60,548,000
Cash paid during the period for
Interest	8,987,000		11,907,000
Income taxes	0		0
Loans foreclosed	4,594,000		10,813,000
Loans securitized into mortgage-backed securities	$ 96,918,000		$ 87,075,000

[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.