Quantitative Information on Financial Instruments Measured on Non Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Fair Value Measurements Of Financial Instruments [Line Items]
Nonperforming loans held for sale, fair value	19,051
Fair Value, Measurements, Nonrecurring | One-to-four units
Fair Value Measurements Of Financial Instruments [Line Items]
Nonperforming loans held for sale, fair value	6,656
Impaired loans, fair value	1,284
Fair Value, Measurements, Nonrecurring | Five or more units
Fair Value Measurements Of Financial Instruments [Line Items]
Nonperforming loans held for sale, fair value	1,956
Impaired loans, fair value	1,679
Fair Value, Measurements, Nonrecurring | Church
Fair Value Measurements Of Financial Instruments [Line Items]
Nonperforming loans held for sale, fair value	1,556
Impaired loans, fair value	6,649
Real estate owned, fair value	5,411
Fair Value, Measurements, Nonrecurring | Commercial Real Estate
Fair Value Measurements Of Financial Instruments [Line Items]
Impaired loans, fair value	3,385
Real estate owned, fair value	2,752
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | One-to-four units
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Sales comparison approach
Unobservable inputs	Adjustment for differences between the comparable sales
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | One-to-four units | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	(30.00%)
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | One-to-four units | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	23.00%
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | Five or more units
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Sales comparison approach
Unobservable inputs	Adjustment for differences between the comparable sales
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | Five or more units | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	(13.00%)
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | Five or more units | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	17.00%
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | Church
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Sales comparison approach
Unobservable inputs	Adjustment for differences between the comparable sales
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | Church | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	(27.00%)
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | Church | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	29.00%
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | Income Approach Valuation Technique | Five or more units
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Income approach
Unobservable inputs	Capitalization rate
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | Income Approach Valuation Technique | Five or more units | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	6.00%
Fair Value, Measurements, Nonrecurring | Non-performing loans receivable held-for-sale | Income Approach Valuation Technique | Five or more units | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	8.50%
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | One-to-four units
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Sales comparison approach
Unobservable inputs	Adjustment for differences between the comparable sales
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | One-to-four units | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	(5.00%)
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | One-to-four units | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	18.00%
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Five or more units
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Sales comparison approach
Unobservable inputs	Adjustment for differences between the comparable sales
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Five or more units | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	(26.00%)
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Five or more units | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	16.00%
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Church
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Sales comparison approach
Unobservable inputs	Adjustment for differences between the comparable sales
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Church | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	(45.00%)
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Church | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	8.00%
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Commercial Real Estate
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Sales comparison approach
Unobservable inputs	Adjustment for differences between the comparable sales
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Commercial Real Estate | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	(17.00%)
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Commercial Real Estate | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	(1.00%)
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Five or more units
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Income approach
Unobservable inputs	Capitalization rate
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Five or more units | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	6.50%
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Five or more units | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	9.00%
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Church
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Income approach
Unobservable inputs	Capitalization rate
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Church | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	6.75%
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Church | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	8.00%
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Commercial Real Estate
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Income approach
Unobservable inputs	Capitalization rate
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Commercial Real Estate | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	7.00%
Fair Value, Measurements, Nonrecurring | Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Commercial Real Estate | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	9.00%
Fair Value, Measurements, Nonrecurring | Real estate owned | Church
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Sales comparison approach
Unobservable inputs	Adjustment for differences between the comparable sales
Fair Value, Measurements, Nonrecurring | Real estate owned | Church | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	(12.00%)
Fair Value, Measurements, Nonrecurring | Real estate owned | Church | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	7.00%
Fair Value, Measurements, Nonrecurring | Real estate owned | Commercial Real Estate
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Sales comparison approach
Unobservable inputs	Adjustment for differences between the comparable sales
Fair Value, Measurements, Nonrecurring | Real estate owned | Commercial Real Estate | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	(67.00%)
Fair Value, Measurements, Nonrecurring | Real estate owned | Commercial Real Estate | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	1.00%
Fair Value, Measurements, Nonrecurring | Real estate owned | Income Approach Valuation Technique | Church
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Income approach
Unobservable inputs	Capitalization rate
Weighted average range	11.50%
Fair Value, Measurements, Nonrecurring | Real estate owned | Income Approach Valuation Technique | Commercial Real Estate
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Income approach
Unobservable inputs	Capitalization rate
Fair Value, Measurements, Nonrecurring | Real estate owned | Income Approach Valuation Technique | Commercial Real Estate | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	8.00%
Fair Value, Measurements, Nonrecurring | Real estate owned | Income Approach Valuation Technique | Commercial Real Estate | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Weighted average range	11.00%