MERGERS AND ACQUISITIONS - Balance Sheets Disclosures (Detail) - USD ($) $ in Thousands	Mar. 11, 2017	Apr. 22, 2016	Feb. 13, 2016	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill recognized				$ 2,244,972	$ 1,032,129
Yadkin Financial Corporation (YDKN) [Member]
Business Acquisition [Line Items]
Fair value of consideration paid	$ 1,783,294
Cash and cash equivalents	196,964
Securities	940,272
Loans	5,114,355
Core deposit and other intangible assets	69,555
Fixed and other assets	465,437
Total identifiable assets acquired	6,786,583
Deposits	5,176,915
Borrowings	969,385
Other liabilities	69,696
Total liabilities assumed	6,215,996
Fair value of net identifiable assets acquired	570,587
Goodwill recognized	$ 1,212,707
Fifth Third Bank Branches [Member]
Business Acquisition [Line Items]
Fair value of consideration paid		$ 0
Cash and cash equivalents		198,872
Securities		0
Loans		95,354
Core deposit and other intangible assets		4,129
Fixed and other assets		14,069
Total identifiable assets acquired		312,424
Deposits		302,529
Borrowings		0
Other liabilities		24,041
Total liabilities assumed		326,570
Fair value of net identifiable assets acquired		(14,146)
Goodwill recognized		$ 14,146
Metro Bancorp Inc [Member]
Business Acquisition [Line Items]
Fair value of consideration paid			$ 404,242
Cash and cash equivalents			46,890
Securities			722,980
Loans			1,862,447
Core deposit and other intangible assets			24,163
Fixed and other assets			127,185
Total identifiable assets acquired			2,783,665
Deposits			2,328,238
Borrowings			227,539
Other liabilities			8,700
Total liabilities assumed			2,564,477
Fair value of net identifiable assets acquired			219,188
Goodwill recognized			$ 185,054