Assets Measured at Fair Value on Non-Recurring Basis (Detail) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
One-to-four units
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on non-performing loans receivable held-for-sale, net	$ 0	$ 0
Gain (loss) on impaired loans carried at fair value of collateral	(425)	(1,005)
Gain (loss) on real estate owned	0	(394)
One-to-four units | Non-performing loans receivable held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	6,656	0
One-to-four units | Impaired loans carried at fair value of collateral
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	1,284	6,201
One-to-four units | Real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	0	718
Five or more units
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on non-performing loans receivable held-for-sale, net	341	(259)
Gain (loss) on impaired loans carried at fair value of collateral	3	(151)
Gain (loss) on real estate owned	0	0
Five or more units | Non-performing loans receivable held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	1,956	2,114
Five or more units | Impaired loans carried at fair value of collateral
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	1,679	874
Five or more units | Real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	0	0
Commercial Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on non-performing loans receivable held-for-sale, net	(5)	(215)
Gain (loss) on impaired loans carried at fair value of collateral	(419)	(3,472)
Gain (loss) on real estate owned	(397)	(1,035)
Commercial Real Estate | Non-performing loans receivable held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	0	338
Commercial Real Estate | Impaired loans carried at fair value of collateral
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	3,385	2,869
Commercial Real Estate | Real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	2,752	3,126
Church
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on non-performing loans receivable held-for-sale, net	(227)	(1,089)
Gain (loss) on impaired loans carried at fair value of collateral	(813)	(3,779)
Gain (loss) on real estate owned	(512)	(239)
Church | Non-performing loans receivable held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	1,556	2,778
Church | Impaired loans carried at fair value of collateral
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	6,649	13,153
Church | Real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	5,411	2,855
Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on impaired loans carried at fair value of collateral	0	(97)
Construction | Impaired loans carried at fair value of collateral
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	0	205
Commercial real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on impaired loans carried at fair value of collateral	0	(2,974)
Commercial real estate | Impaired loans carried at fair value of collateral
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	0	0
Commercial Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on impaired loans carried at fair value of collateral	0	(70)
Commercial Other | Impaired loans carried at fair value of collateral
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	$ 0	$ 0