BUSINESS COMBINATIONS - Acquired Loan Data (Details) - USD ($) $ in Thousands	Jun. 29, 2018	May 25, 2018	Mar. 11, 2016
Atlantic Coast Financial Corporation
Business Acquisition [Line Items]
Acquired receivables subject to ASC 310-30, Fair Value of Acquired Loans at Acquisition Date		$ 10,763
Acquired receivables subject to ASC 310-30, Gross Contractual Amounts Receivable at Acquisition Date		16,077
Acquired receivables subject to ASC 310-30, Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected		4,115
Acquired receivables not subject to ASC 310-30, Fair Value of Acquired Loans at Acquisition Date		744,941
Acquired receivables not subject to ASC 310-30, Gross Contractual Amounts Receivable at Acquisition Date		1,041,768
Acquired receivables not subject to ASC 310-30, Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected		$ 0
Hamilton State Bancshares, Inc.
Business Acquisition [Line Items]
Acquired receivables subject to ASC 310-30, Fair Value of Acquired Loans at Acquisition Date	$ 18,339
Acquired receivables subject to ASC 310-30, Gross Contractual Amounts Receivable at Acquisition Date	21,223
Acquired receivables subject to ASC 310-30, Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	2,090
Acquired receivables not subject to ASC 310-30, Fair Value of Acquired Loans at Acquisition Date	1,279,701
Acquired receivables not subject to ASC 310-30, Gross Contractual Amounts Receivable at Acquisition Date	1,441,534
Acquired receivables not subject to ASC 310-30, Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	$ 0
Jacksonville Bancorp, Inc
Business Acquisition [Line Items]
Acquired receivables subject to ASC 310-30, Fair Value of Acquired Loans at Acquisition Date			$ 26,951
Acquired receivables subject to ASC 310-30, Gross Contractual Amounts Receivable at Acquisition Date			42,314
Acquired receivables subject to ASC 310-30, Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected			9,181
Acquired receivables not subject to ASC 310-30, Fair Value of Acquired Loans at Acquisition Date			374,687
Acquired receivables not subject to ASC 310-30, Gross Contractual Amounts Receivable at Acquisition Date			488,346
Acquired receivables not subject to ASC 310-30, Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected			$ 0