Note 20 - Parent Company Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 2,545	$ 4,324	$ 3,556	$ 6,180	$ 3,584	$ 3,832	$ 3,502	$ 4,074	$ 16,605	$ 14,992	$ 16,459
Deferred income tax (benefit) expense									885	1,631	3,931
Gain on extinguishment of subordinated notes payable to unconsolidated trusts									(4,050)
Net cash provided by operating activities									20,740	25,930	29,011
Net cash provided by investing activities									87,151	15,875	57,254
Cash paid to extinguish subordinated notes payable to unconsolidated trusts									(10,950)
Dividends paid, common stock									(1,575)
Redemption of preferred stock										(10,000)	(20,000)
Dividends paid, preferred stock										(508)	(1,990)
Shares issued under employee stock purchase plan									155	130	129
Net cash used in financing activities									(114,850)	(22,226)	(53,604)
Net increase (decrease) in cash and cash equivalents									(6,959)	19,579	32,661
Cash and cash equivalents at beginning of year				120,493				100,914	120,493	100,914	68,253
Cash and cash equivalents at end of year	113,534				120,493				113,534	120,493	100,914
Employee Stock Purchase Plan Expense [Member]
Noncash compensation expense									32	31	32
Director Fee Compensation [Member]
Noncash compensation expense									92	104	82
Parent Company [Member]
Net income									16,605	14,992	16,459
Equity in undistributed loss (income) of subsidiaries									8,700	(2,727)	(1,040)
Change in other assets and liabilities, net									(1,116)	582	454
Deferred income tax (benefit) expense									(46)	(54)	17
Gain on extinguishment of subordinated notes payable to unconsolidated trusts									(4,050)
Net cash provided by operating activities									20,192	12,901	15,976
Return of equity from nonbank subsidiary									500	1,355	1,500
Net cash provided by investing activities									500	1,355	1,500
Cash paid to extinguish subordinated notes payable to unconsolidated trusts									(10,950)
Dividends paid, common stock									(1,575)
Redemption of preferred stock										(10,000)	(20,000)
Dividends paid, preferred stock										(508)	(1,990)
Shares issued under employee stock purchase plan									155	130	129
Net cash used in financing activities									(12,370)	(10,378)	(21,861)
Net increase (decrease) in cash and cash equivalents									8,322	3,878	(4,385)
Cash and cash equivalents at beginning of year				$ 35,964				$ 32,086	35,964	32,086	36,471
Cash and cash equivalents at end of year	$ 44,286				$ 35,964				44,286	35,964	32,086
Parent Company [Member] | Employee Stock Purchase Plan Expense [Member]
Noncash compensation expense									7	4	4
Parent Company [Member] | Director Fee Compensation [Member]
Noncash compensation expense									$ 92	$ 104	$ 82