Parent Company Only Financial Statements - Condensed Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
ASSETS
CASH AND DUE FROM BANKS	$ 13,963us-gaap_CashAndDueFromBanks	$ 9,836us-gaap_CashAndDueFromBanks
INTEREST-BEARING DEPOSITS IN FINANCIAL INSTITUTIONS	54,960us-gaap_InterestBearingDepositsInBanks	24,921us-gaap_InterestBearingDepositsInBanks
Cash and cash equivalents	68,923	34,757	178,492	151,190
DEFERRED TAX ASSET, Net	8,468us-gaap_DeferredTaxAssetsLiabilitiesNet	8,853us-gaap_DeferredTaxAssetsLiabilitiesNet
OTHER ASSETS	7,819us-gaap_OtherAssets	4,513us-gaap_OtherAssets
TOTAL	2,196,135us-gaap_Assets	1,703,127us-gaap_Assets
LIABILITIES AND SHAREHOLDERS' EQUITY
LIABILITIES-Other liabilities	9,059us-gaap_OtherLiabilities	6,166us-gaap_OtherLiabilities
Total liabilities	1,907,730us-gaap_Liabilities	1,503,909us-gaap_Liabilities
SHAREHOLDERS' EQUITY:
Common stock	262us-gaap_CommonStockValue	208us-gaap_CommonStockValue
Capital surplus	252,421	179,219
Retained earnings (deficit)	34,660	19,918
Accumulated other comprehensive income, net	1,062	(127)
Total shareholders' equity	288,405us-gaap_StockholdersEquity	199,218us-gaap_StockholdersEquity	188,211us-gaap_StockholdersEquity	153,423us-gaap_StockholdersEquity
TOTAL	2,196,135	1,703,127
Green Bancorp, Inc.
ASSETS
CASH AND DUE FROM BANKS	1,290	603
INTEREST-BEARING DEPOSITS IN FINANCIAL INSTITUTIONS	7,376	4,350
Cash and cash equivalents	8,666	4,953	5,447	6,220
DEFERRED TAX ASSET, Net	124	141
INVESTMENT IN GREEN BANK, N.A.	278,949	193,755
OTHER ASSETS	714	382
TOTAL	288,453	199,231
LIABILITIES AND SHAREHOLDERS' EQUITY
LIABILITIES-Other liabilities	47	13
Total liabilities	47	13
SHAREHOLDERS' EQUITY:
Common stock	262	208
Capital surplus	252,422	179,219
Retained earnings (deficit)	34,660	19,918
Accumulated other comprehensive income, net	1,062	(127)
Total shareholders' equity	288,406	199,218
TOTAL	$ 288,453	$ 199,231

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3