Note 2. Fair Value of Financial Instruments (Detail) - Level 3 Fair Value Measurements (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Commercial Real Estate Owner Occupied [Member] | Borrower A [Member] | Adjustment for Differences Between the Comparable Sales [Member]
Commercial real estate:
Fair Value (in Dollars)	$ 2,152
Valuation Technique(s)	Income approach
Unobservable Input(s)	Adjustment for differences between the comparable sales
Range	from -10% to -20%
(Weighted Average)	-18%
Commercial Real Estate Owner Occupied [Member] | Borrower A [Member] | Capitalization Rate [Member]
Commercial real estate:
Valuation Technique(s)	Income approach
Unobservable Input(s)	Capitalization rate
Range	from 7% to 10%
Commercial Real Estate Owner Occupied [Member] | Borrower B [Member] | Capitalization Rate [Member]
Commercial real estate:
Fair Value (in Dollars)	255
Valuation Technique(s)	Income approach
Unobservable Input(s)	Capitalization rate
Range	10%
Commercial Real Estate Nonowner Occupied [Member] | Capitalization Rate [Member]
Commercial real estate:
Fair Value (in Dollars)	$ 409
Valuation Technique(s)	Income approach
Unobservable Input(s)	Capitalization rate
Range	10%