Note 24 - Parent Company Only Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING ACTIVITIES:
Net income	$ 4,605	$ 5,132	$ 6,657	$ 4,917	$ 4,833	$ 4,741	$ 4,542	$ 3,343	$ 21,311	$ 17,459	$ 10,574
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred tax provision (benefit)									6,001	6,219	4,251
Depreciation									3,365	3,706	3,293
Loss (gain) on dispositions of fixed assets, net									8	(1,019)	(85)
Stock compensation expense									959	1,239	724
Changes in operating assets and liabilities:
Net cash provided by operating activities									40,411	24,707	13,926
INVESTING ACTIVITIES:
Purchases of office properties and equipment									(1,328)	(2,069)	(4,652)
Proceeds from sales of office properties and equipment									3	6	951
Cash paid for acquisition, net of cash received									0		(13,931)
Net cash used in investing activities									(145,978)	(114,503)	(37,691)
FINANCING ACTIVITIES:
Proceeds from other borrowings									2,400	4,800	1,850
Repayments of other borrowings									(12,262)	(1,650)	(1,151)
Proceeds from exercise of stock options									643	141	37
Repurchase of common stock										(3,672)	(256)
Shares withheld for payment of employee payroll taxes									(275)	(255)	(185)
Dividends distributed									(4,524)	(2,820)
Net cash provided by (used in) financing activities									80,346	116,454	(37,190)
NET INCREASE IN CASH AND CASH EQUIVALENTS									(25,221)	26,658	(60,955)
CASH AND CASH EQUIVALENTS:
Beginning of period				78,789				52,131	78,789	52,131	113,086
End of period	53,568				78,789				53,568	78,789	52,131
Parent Company [Member]
OPERATING ACTIVITIES:
Net income									21,311	17,459	10,574
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed net income of Bank									(10,528)	(14,265)	(699)
Deferred tax provision (benefit)									782	(164)	(1,174)
Depreciation									31	95	118
Loss (gain) on dispositions of fixed assets, net									28
Stock compensation expense									562	639	539
Changes in operating assets and liabilities:
Other assets									267	(543)	247
Accrued expenses and other liabilities									2,935	45	87
Net cash provided by operating activities									15,388	3,266	9,692
INVESTING ACTIVITIES:
Purchases of office properties and equipment										(8)	(48)
Proceeds from sales of office properties and equipment									431
Cash paid for acquisition, net of cash received											(10,100)
Net cash used in investing activities									431	(8)	(10,148)
FINANCING ACTIVITIES:
Proceeds from other borrowings									2,400	4,800	1,850
Repayments of other borrowings									(12,262)	(1,650)	(1,151)
Proceeds from exercise of stock options									643	141	37
Repurchase of common stock										(3,672)	(256)
Shares withheld for payment of employee payroll taxes									(275)
Dividends distributed									(4,524)	(2,820)
Net cash provided by (used in) financing activities									(14,018)	(3,201)	480
NET INCREASE IN CASH AND CASH EQUIVALENTS									1,801	57	24
CASH AND CASH EQUIVALENTS:
Beginning of period				$ 175				$ 118	175	118	94
End of period	$ 1,976				$ 175				$ 1,976	$ 175	$ 118