Note 19 - Parent Company Financial Statements (Detail) - Condensed Statements of Income and Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income
Other noninterest income	$ 35	$ 27	$ 351
Expense
Interest expense - subordinated notes payable to unconsolidated trusts	1,879	2,026	2,035
Noninterest expense	59,787	62,492	62,711
Income before income tax (benefit) expense and equity in undistributed income of subsidiaries	15,059	2,091	8,969
Income tax (benefit) expense	2,910	(647)	2,037
Net income	12,149	2,738	6,932
Other comprehensive income (loss)	226	5,745	(2,966)
Comprehensive income	12,375	8,483	3,966
Parent Company [Member]
Income
Dividends from subsidiaries	12,012	4,511	6,627
Interest	19	16	12
Other noninterest income	3,476	3,369	3,637
Total income	15,507	7,896	10,276
Expense
Interest expense - subordinated notes payable to unconsolidated trusts	1,879	2,026	2,035
Interest expense on other borrowed funds		2	2
Noninterest expense	3,875	3,484	3,689
Total expense	5,754	5,512	5,726
Income before income tax (benefit) expense and equity in undistributed income of subsidiaries	9,753	2,384	4,550
Income tax (benefit) expense	(759)	(854)	411
Income before equity in undistributed income of subsidiaries	10,512	3,238	4,139
Equity in undistributed income (loss) of subsidiaries	1,637	(500)	2,793
Net income	12,149	2,738	6,932
Other comprehensive income (loss)	226	5,745	(2,966)
Comprehensive income	$ 12,375	$ 8,483	$ 3,966