Note 21 - Condensed Financial Information (Parent Company Only) - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Provision for income taxes	$ 46,624	$ 32,900	$ 14,602
NET INCOME	96,814	74,364	35,688
Preferred stock dividends	24	257
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	96,790	74,107	35,688
Parent Company [Member]
Dividends from subsidiaries	83,710	84,128	43,366
Other income	2,465	2,303	6,927
Income	86,175	86,431	50,293
EXPENSE	21,990	24,594	23,024
Income before income taxes and equity in undistributed net income of subsidiaries	64,185	61,837	27,269
Provision for income taxes	(7,557)	(8,251)	(6,330)
Income before equity in undistributed net income of subsidiaries	71,742	70,088	33,599
Equity in undistributed net income of subsidiaries	25,072	4,276	2,089
NET INCOME	96,814	74,364	35,688
Preferred stock dividends	24	257
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$ 96,790	$ 74,107	$ 35,688