Parent Company Only Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
CASH AND DUE FROM BANKS	$ 15,915	$ 13,963
INTEREST-BEARING DEPOSITS IN FINANCIAL INSTITUTIONS	107,687	54,960
Total cash and cash equivalents	124,906	68,923	$ 34,757	$ 178,492
DEFERRED TAX ASSET, Net	19,510	8,468
Investment in Patriot Bancshares Capital Trusts I and II	666
Goodwill	85,291	30,129	15,672
OTHER ASSETS	26,567	7,819
TOTAL ASSETS	3,786,157	2,196,135
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debentures	13,187
LIABILITIES-Other liabilities	14,612	9,059
Total liabilities	3,356,755	1,907,730
SHAREHOLDERS' EQUITY:
Common stock	368	262
Capital surplus	378,518	252,421
Retained earnings (deficit)	50,099	34,660
Accumulated other comprehensive income, net	417	1,062
Total shareholders' equity	429,402	288,405	199,218	188,211
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	3,786,157	2,196,135
Green Bancorp, Inc.
ASSETS
CASH AND DUE FROM BANKS	3,911	1,290
INTEREST-BEARING DEPOSITS IN FINANCIAL INSTITUTIONS	6,411	7,376
Total cash and cash equivalents	10,322	8,666	$ 4,953	$ 5,447
DEFERRED TAX ASSET, Net		124
INVESTMENT IN GREEN BANK, N.A.	420,966	278,949
Investment in Patriot Bancshares Capital Trusts I and II	666
Goodwill	12,673
OTHER ASSETS	1,236	714
TOTAL ASSETS	445,863	288,453
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debentures	13,187
Deferred Income Tax Liabilities, Net	3,037
LIABILITIES-Other liabilities	237	47
Total liabilities	16,461	47
SHAREHOLDERS' EQUITY:
Common stock	368	262
Capital surplus	378,518	252,422
Retained earnings (deficit)	50,099	34,660
Accumulated other comprehensive income, net	417	1,062
Total shareholders' equity	429,402	288,406
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 445,863	$ 288,453