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Number of shares of equity interests issued or issuable to acquire entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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No definition available.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash outflow associated with other payments to acquire businesses including deposit on pending acquisitions and preacquisition costs.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Number of shares issued which are neither cancelled nor held in the treasury.

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BUSINESS COMBINATIONS - Purchase Price (Details)				1 Months Ended
BUSINESS COMBINATIONS - Purchase Price (Details)	Nov. 03, 2017 USD ($) $ / shares shares	Apr. 07, 2017 USD ($) $ / shares shares	Mar. 11, 2016 USD ($) $ / shares shares	Oct. 20, 2017 USD ($) $ / shares shares	Sep. 30, 2017 shares	Dec. 31, 2016 shares
Business Acquisition [Line Items]
Number of NorthStar Banking Corporation common shares outstanding \| shares					43,512,179	38,021,835
Floridian Financial Group [Member]
Business Acquisition [Line Items]
Shares exchanged for cash			$ 26,699,000
Number of GulfShore Bancshares, Inc. common shares outstanding \| shares			6,222,119
Per share exchange ratio			0.5289
Number of shares of Seacoast common stock issued \| shares			3,291,066
Multiplied by common stock price per share \| $ / shares			$ 15.47
Value of common stock issued			$ 50,912,791
Total purchase price			$ 77,611,791
Gulf Shore Banc shares Inc [Member]
Business Acquisition [Line Items]
Shares exchanged for cash		$ 8,033,999
Number of GulfShore Bancshares, Inc. common shares outstanding \| shares		5,464,308
Per share exchange ratio		0.4807
Number of shares of Seacoast common stock issued \| shares		2,626,693
Multiplied by common stock price per share \| $ / shares		$ 23.94
Value of common stock issued		$ 62,883,030
Total purchase price		$ 70,917,029
NorthStar Bank [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Shares exchanged for cash				$ 4,700,129
Number of NorthStar Banking Corporation common shares outstanding \| shares				1,958,387
Per share exchange ratio				0.5605
Number of shares of Seacoast common stock issued \| shares				1,097,675
Multiplied by common stock price per share \| $ / shares				$ 24.92
Value of common stock issued				$ 27,354,061
Cash paid for NorthStar Banking vested Corporation stock options				801,168
Total purchase price				$ 32,855,358
Palm Beach Community Bank [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Shares exchanged for cash	$ 15,693,929
Number of NorthStar Banking Corporation common shares outstanding \| shares	2,506,867
Per share exchange ratio	0.9240
Number of shares of Seacoast common stock issued \| shares	2,316,345
Multiplied by common stock price per share \| $ / shares	$ 24.31
Value of common stock issued	$ 56,310,350
Total purchase price	$ 72,004,279