Note 8: Disclosures about Fair Value of Assets and Liabilities (Detail) - Quantitative Information About Level 3 Fair Value Measurements (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Collateral Dependent Impaired Loans [Member] | Valuation Technique [Member]
Valuation Technique	Market Comparable
Collateral Dependent Impaired Loans [Member] | Unobservable Input [Member]
Valuation Technique	Discount to reflect realizable value
Collateral Dependent Impaired Loans [Member] | Minimum [Member]
Range	0.00%
Collateral Dependent Impaired Loans [Member] | Maximum [Member]
Range	45.00%
Collateral Dependent Impaired Loans [Member] | Weighted Average [Member]
Range	(2.00%)
Collateral Dependent Impaired Loans [Member]
Fair Value (in Dollars)	14,468
Impaired Loans [Member] | Valuation Technique [Member]
Valuation Technique	Discounted cash flow
Impaired Loans [Member] | Unobservable Input [Member]
Valuation Technique	Discount rate
Impaired Loans [Member] | Weighted Average [Member]
Range	0.00%
Impaired Loans [Member]
Fair Value (in Dollars)	1,704
Foreclosed Assets Held for Sale [Member] | Valuation Technique [Member]
Valuation Technique	Market Comparable
Foreclosed Assets Held for Sale [Member] | Unobservable Input [Member]
Valuation Technique	Discount to reflect realizable value
Foreclosed Assets Held for Sale [Member] | Minimum [Member]
Range	0.00%
Foreclosed Assets Held for Sale [Member] | Maximum [Member]
Range	44.00%
Foreclosed Assets Held for Sale [Member] | Weighted Average [Member]
Range	(13.00%)
Foreclosed Assets Held for Sale [Member]
Fair Value (in Dollars)	4,923