BUSINESS COMBINATIONS - Acquired Loan Data (Details) - USD ($) $ in Thousands	Jul. 01, 2019	Jun. 29, 2018	May 25, 2018
Fidelity Southern Corporation
Business Acquisition [Line Items]
Acquired receivables subject to ASC 310-30, Fair Value of Acquired Loans at Acquisition Date	$ 120,693
Acquired receivables subject to ASC 310-30, Gross Contractual Amounts Receivable at Acquisition Date	191,534
Acquired receivables subject to ASC 310-30, Best Estimate at Acquisition Date of Contractual Cash Flows Not Expected to be Collected	23,668
Acquired receivables not subject to ASC 310-30, Fair Value of Acquired Loans at Acquisition Date	3,390,952
Acquired receivables not subject to ASC 310-30, Gross Contractual Amounts Receivable at Acquisition Date	4,217,890
Certain Loans Acquired In Transfers Accounted For As Debts Securities Acquired During Period Cash Flows Not Expected To Be Collected At Acquisition	$ 32,466
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
Certain Loans Acquired In Transfers Accounted For As Debts Securities Acquired During Period Cash Flows Not Expected To Be Collected At Acquisition			$ 0
Hamilton State Bancshares, Inc.
Business Acquisition [Line Items]
Acquired receivables subject to ASC 310-30, Fair Value of Acquired Loans at Acquisition Date		$ 18,589
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		1,840
Acquired receivables not subject to ASC 310-30, Fair Value of Acquired Loans at Acquisition Date		1,274,597
Acquired receivables not subject to ASC 310-30, Gross Contractual Amounts Receivable at Acquisition Date		1,441,534
Certain Loans Acquired In Transfers Accounted For As Debts Securities Acquired During Period Cash Flows Not Expected To Be Collected At Acquisition		$ 5,104