Parent Company - Condensed Statement of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
INCOME
Interest income	$ 9,393	$ 9,849	$ 9,884	$ 10,719	$ 8,853	$ 6,736	$ 6,771	$ 6,708	$ 39,845	$ 29,068	$ 28,896
Net gains on sale of investments									749	343	778
EXPENSES
Interest expense	2,578	2,642	2,806	3,231	3,908	3,840	4,063	4,321	11,257	16,132	18,280
Professional fees									1,868	1,368	1,488
Other									2,746	2,348	2,154
Total noninterest expense	8,013	8,154	8,790	7,505	12,943	6,526	6,874	6,662	32,462	33,005	26,045
Income (loss) before income taxes	2,320	2,395	2,702	4,240	(2,797)	1,105	870	1,070	11,657	248	7,121
Income tax expense (benefit)	292	519	662	1,361	(673)	311	211	184	2,834	33	1,863
Net income	2,028	1,876	2,040	2,879	(2,124)	794	659	886	8,823	215	5,258
Parent Company [Member]
INCOME
Interest income									408	403	473
Net gains on sale of investments									30		99
Dividends									15,000	25,000	10,000
Total income									15,438	25,403	10,572
EXPENSES
Interest expense										101
Professional fees									505	1,741	303
Other									527	132	63
Total noninterest expense									1,032	1,974	366
Income (loss) before income taxes									14,406	23,429	10,206
Income tax expense (benefit)										(32)	94
Income before equity in undistributed net earnings of subsidiary									14,406	23,461	10,112
Equity in undistributed net earnings of subsidiary									(5,583)	(23,246)	(4,854)
Net income									$ 8,823	$ 215	$ 5,258