Note 24 - Parent Company Only Financial Information - Condensed Statements of Income and Comprehensive Income (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
EXPENSES:
Interest expense	$ 3,079	$ 2,958	$ 2,496	$ 2,214	$ 2,105	$ 2,014	$ 1,935	$ 1,864	$ 10,747	$ 7,918	$ 6,364
Salaries and employee benefits									28,519	31,168	25,742
Net occupancy expense									6,987	7,414	6,411
Data processing									5,769	5,520	6,411
Professional fees									1,860	2,212	1,923
INCOME TAX PROVISION	5,544	2,072	3,078	2,300	2,192	2,384	847	1,436	12,995	6,859	4,639
NET INCOME	$ 4,605	$ 5,132	$ 6,657	$ 4,917	$ 4,833	$ 4,741	$ 4,542	$ 3,343	21,311	17,459	10,574
OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the period									2,671	(2,933)	(290)
Less: reclassification adjustments for realized gain included in net income									(48)	(19)	(20)
Other comprehensive income (loss)									1,616	(1,822)	(191)
COMPREHENSIVE INCOME									22,927	15,637	10,383
Parent Company [Member]
INCOME:
Dividend from the Bank									14,000	5,000	12,100
Other income									1	73
Management fees									2,117	2,965	3,451
Total income									16,118	8,038	15,551
EXPENSES:
Interest expense									460	649	407
Salaries and employee benefits									3,354	3,320	2,383
Net occupancy expense									211	226	198
Data processing									1	9	1,291
Professional fees									614	785	627
Advertising									74	47	359
Other operating expenses									2,194	941	1,585
Total expenses									6,908	5,977	6,850
INCOME BEFORE INCOME TAXES AND EQUITY IN UNDISTRIBUTED INCOME OF BANK SUBSIDIARY									9,210	2,061	8,701
INCOME TAX PROVISION									(1,573)	(1,133)	(1,174)
INCOME BEFORE EQUITY IN UNDISTRIBUTED INCOME OF BANK SUBSIDIARY									10,783	3,194	9,875
EQUITY IN UNDISTRIBUTED INCOME OF BANK SUBSIDIARY									10,528	14,265	699
NET INCOME									21,311	17,459	10,574
OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) arising during the period									2,671	(2,933)	(290)
Less: reclassification adjustments for realized gain included in net income									(48)	(19)	(20)
Other comprehensive income (loss), before tax effect									2,623	(2,952)	(310)
Tax effect									(1,007)	1,130	119
Other comprehensive income (loss)									1,616	(1,822)	(191)
COMPREHENSIVE INCOME									$ 22,927	$ 15,637	$ 10,383