Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal income tax statutory rate (as a percent)	35.00%	35.00%	35.00%
Reconciliation of provision for income taxes
Taxes calculated at statutory rate	$ 9,014	$ 8,087	$ 6,831
Increase (decrease) resulting from:
State tax expense, net of federal effect	196	209	174
Non-deductible expenses	45	35	65
Incentive stock compensation expense	31	34	5
Bank-owned life insurance income	141
Change in applicable statutory rate			(211)
Acquisition related expenses	857
Other, net	312		42
Income Tax Expense (Benefit), Total	10,314	8,365	6,906
Green Bancorp, Inc.
Increase (decrease) resulting from:
Income Tax Expense (Benefit), Total	$ (925)	$ (654)	$ (346)