Quantitative Information on Financial Instruments Measured on Non Recurring Basis (Detail) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Five or more units
Fair Value Measurements Of Financial Instruments [Line Items]
Non-performing loans held for sale, fair value	3,033
Commercial real estate
Fair Value Measurements Of Financial Instruments [Line Items]
Non-performing loans held for sale, fair value	3,004
Impaired loans, fair value	417
Real estate owned, fair value	2,591
Church
Fair Value Measurements Of Financial Instruments [Line Items]
Non-performing loans held for sale, fair value	2,023
Impaired loans, fair value	4,420
Real estate owned, fair value	6,703
One-to-four units
Fair Value Measurements Of Financial Instruments [Line Items]
Impaired loans, fair value	1,235
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
Non-performing loans receivable held-for-sale | Five or more units | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	(26.00%)
Non-performing loans receivable held-for-sale | Five or more units | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	20.00%
Non-performing loans receivable held-for-sale | 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
Non-performing loans receivable held-for-sale | Commercial real estate | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	(49.00%)
Non-performing loans receivable held-for-sale | Commercial real estate | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	1.00%
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
Non-performing loans receivable held-for-sale | Church | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	(27.00%)
Non-performing loans receivable held-for-sale | Church | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	29.00%
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
Non-performing loans receivable held-for-sale | Income Approach Valuation Technique | Five or more units | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	6.00%
Non-performing loans receivable held-for-sale | Income Approach Valuation Technique | Five or more units | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	9.00%
Non-performing loans receivable held-for-sale | Income Approach Valuation Technique | Commercial real estate
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Income approach
Unobservable inputs	Capitalization rate
Non-performing loans receivable held-for-sale | Income Approach Valuation Technique | Commercial real estate | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	7.00%
Non-performing loans receivable held-for-sale | Income Approach Valuation Technique | Commercial real estate | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	9.00%
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
Unobservable Input(s), Adjustments, Range	2.00%
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
Impaired loans carried at fair value of collateral | Church | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	(45.00%)
Impaired loans carried at fair value of collateral | Church | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	8.00%
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
Impaired loans carried at fair value of collateral | One-to-four units | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	(5.00%)
Impaired loans carried at fair value of collateral | One-to-four units | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	18.00%
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
Unobservable Input(s), Adjustments, Range	4.50%
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
Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Church | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	6.75%
Impaired loans carried at fair value of collateral | Income Approach Valuation Technique | Church | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	8.00%
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
Real estate owned | Commercial real estate | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	(67.00%)
Real estate owned | Commercial real estate | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	1.00%
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
Real estate owned | Church | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	(34.00%)
Real estate owned | Church | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	7.00%
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
Real estate owned | Income Approach Valuation Technique | Commercial real estate | Minimum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	8.00%
Real estate owned | Income Approach Valuation Technique | Commercial real estate | Maximum
Fair Value Measurements Of Financial Instruments [Line Items]
Unobservable Input(s), Adjustments, Range	11.00%
Real estate owned | Income Approach Valuation Technique | Church
Fair Value Measurements Of Financial Instruments [Line Items]
Valuation Technique	Income approach
Unobservable inputs	Capitalization rate
Unobservable Input(s), Adjustments, Range	11.50%