BUSINESS COMBINATIONS - Purchased Credit-Impaired Loans Acquired (Details) - USD ($) $ in Thousands	Jun. 29, 2018	May 25, 2018	Mar. 11, 2016
Atlantic Coast Financial Corporation
Business Acquisition [Line Items]
Contractually required principal and interest		$ 16,077
Non-accretable difference		(4,115)
Cash flows expected to be collected		11,962
Accretable yield		(1,199)
Total purchased credit-impaired loans acquired		10,763
Certain Loans Acquired in Transfer, Accretable Yield		$ 10,800
Hamilton State Bancshares, Inc.
Business Acquisition [Line Items]
Contractually required principal and interest	$ 21,223
Non-accretable difference	(2,090)
Cash flows expected to be collected	19,133
Accretable yield	(794)
Certain Loans Acquired in Transfer, Accretable Yield	$ 18,339
Jacksonville Bancorp, Inc
Business Acquisition [Line Items]
Contractually required principal and interest			$ 42,314
Non-accretable difference			(9,181)
Cash flows expected to be collected			33,133
Accretable yield			(6,182)
Total purchased credit-impaired loans acquired			26,951
Certain Loans Acquired in Transfer, Accretable Yield			$ 27,000