Note 8: Disclosures about Fair Value of Assets and Liabilities (Detail) - Fair Value of Assets Measured on Non-Recurring Basis (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Foreclosed Assets Held for Sale [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value of Nonrecurring Assets	$ 24,083	$ 3,626
Foreclosed Assets Held for Sale [Member]
Fair Value of Nonrecurring Assets	24,083	3,626
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value of Nonrecurring Assets	4,804	11,243
Impaired Loans [Member]
Fair Value of Nonrecurring Assets	$ 4,804	$ 11,243