LOANS AND LEASES - Acquisition of Purchased Loans (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Accretable yield	$ (164,219)	$ (77,180)
Yadkin Financial Corporation (YDKN) [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required cash flows at acquisition	5,131,765
Non-accretable difference (expected losses and foregone interest)	(430,097)
Cash flows expected to be collected at acquisition	4,701,668
Accretable yield	(444,715)
Fair value of acquired loans at acquisition	4,256,953
Yadkin Financial Corporation (YDKN) [Member] | Acquired Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required cash flows at acquisition	46,053
Non-accretable difference (expected losses and foregone interest)	(23,924)
Cash flows expected to be collected at acquisition	22,129
Accretable yield	(3,266)
Fair value of acquired loans at acquisition	18,863
Yadkin Financial Corporation (YDKN) [Member] | Acquired Performing Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required cash flows at acquisition	5,085,712
Non-accretable difference (expected losses and foregone interest)	(406,173)
Cash flows expected to be collected at acquisition	4,679,539
Accretable yield	(441,449)
Fair value of acquired loans at acquisition	$ 4,238,090