Organization and Summary of Significant Accounting and Reporting Policies - Initial Public Offering (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended		1 Months Ended
	Aug. 07, 2014	Dec. 31, 2014	Dec. 31, 2012	Aug. 31, 2014
Initial Public Offering (IPO)
Shares issued in IPO	5,390,625
Share price (in dollars per share)	$ 15
Total proceeds received, net of offering costs	$ 72,500
Green Bancorp, Inc.
Initial Public Offering (IPO)
Total proceeds received, net of offering costs		72,591	24,734
Common | IPO
Initial Public Offering (IPO)
Shares issued in IPO				5,400,000
Total proceeds received, net of offering costs				$ 72,500