Note 20 - Parent Company Financial Statements - Condensed Statements of Income and Comprehensive Income (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
Gain on debt extinguishment                 $ 4,050
Other noninterest income                 420 450 984
Interest on subordinated notes payable to unconsolidated trusts                 723 866 844
Noninterest expense $ 15,221 $ 17,888 [1] $ 13,884 $ 14,407 $ 14,685 $ 14,281 $ 14,474 $ 14,510 61,400 57,950 59,278
Income before income tax benefit and equity in undistributed income of subsidiaries 3,476 5,884 4,791 8,895 4,664 5,271 4,871 5,479      
Income tax expense 931 1,560 1,235 2,715 1,080 1,439 1,369 1,405 6,441 5,293 6,099
Net income $ 2,545 $ 4,324 $ 3,556 $ 6,180 $ 3,584 $ 3,832 $ 3,502 $ 4,074 16,605 14,992 16,459
Other comprehensive income                 (6,190) (2,093) 8,087
Comprehensive income                 10,415 12,899 24,546
Parent Company [Member]                      
Dividends from subsidiaries                 24,820 14,426 16,525
Interest                 39 12 28
Gain on debt extinguishment                 4,050
Other noninterest income                 2,442 2,555 3,132
Total income                 31,351 16,993 19,685
Interest on subordinated notes payable to unconsolidated trusts                 723 866 844
Noninterest expense                 5,050 4,938 3,977
Total expense                 5,773 5,804 4,821
Income before income tax benefit and equity in undistributed income of subsidiaries                 25,578 11,189 14,864
Income tax expense                 273 (1,076) (555)
Income before equity in undistributed income of subsidiaries                 25,305 12,265 15,419
Equity in undistributed (loss) income of subsidiaries                 (8,700) 2,727 1,040
Net income                 16,605 14,992 16,459
Other comprehensive income                 (6,190) (2,093) 8,087
Comprehensive income                 $ 10,415 $ 12,899 $ 24,546
[1] Noninterest income includes $3.8 million of gain on the sale of investment securities and noninterest expense includes $3.8 million of loss on the early extinguishment of debt, both related to a series of transactions to deleverage the balance sheet.