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	Sep. 30, 2012	Dec. 31, 2011
9/30/2012
Available-for-sale securities	$ 98,378	$ 81,065
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
9/30/2012
Available-for-sale securities	72	62
Equity Securities [Member]
9/30/2012
Available-for-sale securities	72	62
US Government Agencies [Member] | Fair Value, Inputs, Level 2 [Member]
9/30/2012
Available-for-sale securities	49,051	34,727
US Government Agencies [Member]
9/30/2012
Available-for-sale securities	49,051	34,727
Municipals [Member] | Fair Value, Inputs, Level 1 [Member]
9/30/2012
Available-for-sale securities		2,043
Municipals [Member] | Fair Value, Inputs, Level 2 [Member]
9/30/2012
Available-for-sale securities	8,856
Municipals [Member]
9/30/2012
Available-for-sale securities	8,856	2,043
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
9/30/2012
Available-for-sale securities	1,881	4,144
Corporate Bonds [Member]
9/30/2012
Available-for-sale securities	1,881	4,144
Government Sponsored Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
9/30/2012
Available-for-sale securities	38,518	40,089
Government Sponsored Mortgage-Backed Securities [Member]
9/30/2012
Available-for-sale securities	38,518	40,089
Fair Value, Inputs, Level 1 [Member]
9/30/2012
Available-for-sale securities	72	2,105
Fair Value, Inputs, Level 2 [Member]
9/30/2012
Available-for-sale securities	$ 98,306	$ 78,960