Note 8: Disclosures about Fair Value of Assets and Liabilities (Detail) - Fair Value of Assets Measured on Recurring Basis (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Available-for-sale securities	$ 102,856	$ 81,065
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities	68	62
Equity Securities [Member]
Available-for-sale securities	68	62
US Government Agencies [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	49,568	34,727
US Government Agencies [Member]
Available-for-sale securities	49,568	34,727
Municipals [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities		2,043
Municipals [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	8,215
Municipals [Member]
Available-for-sale securities	8,215	2,043
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	1,822	4,144
Corporate Bonds [Member]
Available-for-sale securities	1,822	4,144
Government Sponsored Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	43,183	40,089
Government Sponsored Mortgage-Backed Securities [Member]
Available-for-sale securities	43,183	40,089
Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities	68	2,105
Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities	$ 102,788	$ 78,960