Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013 Fund	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Income Tax Holiday [Line Items]
Income tax rate before income taxes			34.00%	34.00%	34.00%
Additional income tax expense resulting from incorrectly accounting	$ 864,000	$ 864,000
Interest and penalties related to income tax		88,000
Deferred tax assets	13,296,000		13,296,000	10,935,000
Investment in housing fund						2,500,000
Amount of tax benefit, for federal			158,000	158,000	158,000
Amount of tax benefit, for state			0	0	28,000
Number of affordable housing funds			3
Committed contributions			5,500,000
Unrecognized tax benefits	0		0	0
California affordable housing fund - 2006 I, LLC [Member]
Income Tax Holiday [Line Items]
Amount of tax benefit, for federal			64,000
Amount of tax benefit, for state			$ 3,000