BUSINESS COMBINATIONS - Purchase Price (Details) $ / shares in Units, $ in Thousands	Nov. 03, 2017 USD ($) $ / shares shares	Oct. 20, 2017 USD ($) $ / shares shares	Apr. 07, 2017 USD ($) $ / shares shares	Mar. 11, 2016 USD ($) $ / shares shares
Floridian Financial Group [Member]
Business Acquisition [Line Items]
Shares exchanged for cash				$ 26,699
Number of Palm Beach Community Bank Common shares outstanding | shares				6,222
Per share exchange ratio				0.5289
Number of shares of common stock issued | shares				3,291
Multiplied by common stock price per share | $ / shares				$ 15.47
Value of common stock issued				$ 50,913
Total purchase price				$ 77,612
Bank shares, Inc [Member]
Business Acquisition [Line Items]
Shares exchanged for cash	$ 15,694
Number of Palm Beach Community Bank Common shares outstanding | shares	2,507
Per share exchange ratio	0.9240
Number of shares of common stock issued | shares	2,316
Multiplied by common stock price per share | $ / shares	$ 24.31
Value of common stock issued	$ 56,312
Total purchase price	$ 72,006
Gulf Shore Banc shares Inc [Member]
Business Acquisition [Line Items]
Shares exchanged for cash			$ 8,034
Number of Palm Beach Community Bank Common shares outstanding | shares			5,464
Per share exchange ratio			0.4807
Number of shares of common stock issued | shares			2,627
Multiplied by common stock price per share | $ / shares			$ 23.94
Value of common stock issued			$ 62,883
Total purchase price			$ 70,917
NorthStar Bank [Member]
Business Acquisition [Line Items]
Shares exchanged for cash		$ 4,701
Number of Palm Beach Community Bank Common shares outstanding | shares		1,958
Per share exchange ratio		0.5605
Number of shares of common stock issued | shares		1,098
Multiplied by common stock price per share | $ / shares		$ 24.92
Value of common stock issued		$ 27,353
Cash paid for NorthStar Banking vested Corporation stock options		801
Total purchase price		$ 32,855