Note 17 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended	12 Months Ended
	Jul. 14, 2017	Sep. 30, 2017	Dec. 31, 2016
Stockholders' Equity Attributable to Parent		$ 1,968,699	$ 1,828,539
Stockholders' Equity, Period Increase (Decrease)		140,200	$ 150,100
Dividends, Common Stock, Cash		50,500
Adjustments Related to Tax Withholding for Share-based Compensation		$ 5,100
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		932,461	943,345
U.S. Treasury [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		1,846,374
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 20.96	$ 20.65
Class of Warrant or Right, Increase in Warrants Exercisable, Percentage			1.50%
SinoPac Bancorp [Member]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 34,862