Parent Company Only Financial Statements - Condensed Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
INCOME-Interest income	$ 108,554	$ 79,605	$ 68,459
Interest expense on subordinated debentures	227
Total noninterest expense	66,178	52,433	39,965
INCOME BEFORE INCOME TAXES	25,753	23,107	19,516
BENEFIT FOR INCOME TAXESBENEFIT FOR INCOME TAXES	(10,314)	(8,365)	(6,906)
NET INCOME	15,439	14,742	12,610
Green Bancorp, Inc.
INCOME-Interest income	39	26	23
Total income	39	26	23
Interest expense on subordinated debentures	227
EXPENSE-General and administrative	3,293	1,894	1,012
Total noninterest expense	3,520	1,894	1,012
LOSS BEFORE EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARY AND INCOME TAXES	(3,481)	(1,868)	(989)
EQUITY IN UNDISTRIBUTED EARNINGS OF SUBSIDIARY, Net of tax	(17,995)	(15,957)	(13,253)
INCOME BEFORE INCOME TAXES	14,514	14,089	12,264
BENEFIT FOR INCOME TAXESBENEFIT FOR INCOME TAXES	925	654	346
NET INCOME	$ 15,439	$ 14,743	$ 12,610