Note 3. Securities (Detail) - Securities Available for Sale with Unrealized Losses (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
U.S. Government sponsored
Less than 12 months fair value	$ 13,392
Less than 12 months unrealized loss	(27)
Fair Value	13,392
Unrealized loss	(27)
US Government-sponsored Enterprises Debt Securities [Member]
U.S. Government sponsored
Less than 12 months fair value	1,005
Less than 12 months unrealized loss	(6)
Fair Value	1,005
Unrealized loss	(6)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
U.S. Government sponsored
Less than 12 months fair value	12,387	7,621
Less than 12 months unrealized loss	(21)	(12)
Fair Value	12,387	7,621
Unrealized loss	$ (21)	$ (12)