Shareholders' Equity - IPO (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)
Issuance of common stock in connection with initial public offering, net of expenses (in shares)	5,390,625
Proceeds from issuance of common stock, gross		$ 72,591	$ 24,734
Proceeds from issuance of common stock, net of issuance expenses	72,500
Common
Initial Public Offering (IPO)
Payments to Acquire Interest in Subsidiaries and Affiliates		67,500
Green Bancorp, Inc.
Initial Public Offering (IPO)
Proceeds from issuance of common stock, net of issuance expenses		72,591	24,734
Payments to Acquire Interest in Subsidiaries and Affiliates		67,508	25,000
IPO | Common
Initial Public Offering (IPO)
Issuance of common stock in connection with initial public offering, net of expenses (in shares)				5,400,000
Proceeds from issuance of common stock, gross				80,900
Proceeds from issuance of common stock, net of issuance expenses				$ 72,500
Ownership interest by single investor, maximum percentage				24.90%