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	6 Months Ended
	Jun. 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	70.00%
Collateral Dependent Impaired Loans [Member] | Weighted Average [Member]
Range	(17.00%)
Collateral Dependent Impaired Loans [Member]
Fair Value (in Dollars)	16,273
Impaired Loans [Member] | Valuation Technique [Member]
Valuation Technique	Discounted cash flow
Impaired Loans [Member] | Unobservable Input [Member]
Valuation Technique	Discount rate
Impaired Loans [Member] | Minimum [Member]
Range	0.00%
Impaired Loans [Member] | Maximum [Member]
Range	16.00%
Impaired Loans [Member] | Weighted Average [Member]
Range	(13.00%)
Impaired Loans [Member]
Fair Value (in Dollars)	7,810
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	17.00%
Foreclosed Assets Held for Sale [Member] | Weighted Average [Member]
Range	(2.00%)
Foreclosed Assets Held for Sale [Member]
Fair Value (in Dollars)	4,804