LOANS AND LEASES (Loan Portfolio Segment Balances) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 6,250,073	$ 4,314,248
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	702,939	497,948
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	525,574	455,829
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,184,421	857,196
Commercial Real Estate Portfolio Segment [Member] | Commercial Investor Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,923,827	1,112,710
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition, Development and Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	609,266	292,443
Residential Portfolio Segment [Member] | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,106,674	921,435
Residential Portfolio Segment [Member] | Residential Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 197,372	$ 176,687