Note 6 - Goodwill And Core Deposit Premiums (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill	$ 60,605,000	$ 60,605,000
"Truman" [Member] | Core Deposit Premium [Member]
Finite-lived Intangible Assets Acquired	1,200,000
"Excel" [Member] | Core Deposit Premium [Member]
Finite-lived Intangible Assets Acquired	1,300,000
Core Deposit Premium [Member]
Finite-Lived Intangible Asset, Useful Life	10 years
Amortization of Intangible Assets	347,000	884,000	786,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	514,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	410,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	403,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	401,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 401,000