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