ALLOWANCE FOR CREDIT LOSSES - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	$ 160,782	$ 147,800	$ 158,059	$ 142,012
Charge- Offs	(15,134)	(12,914)	(26,428)	(20,798)
Recoveries	3,295	2,843	6,462	4,747
Net Charge- Offs	(11,839)	(10,071)	(19,966)	(16,051)
Provision for credit losses	16,756	16,640	27,606	28,408
Balance at End of Period	165,699	154,369	165,699	154,369
Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	154,214	142,220	150,791	135,285
Charge- Offs	(15,059)	(12,449)	(25,871)	(19,952)
Recoveries	2,399	2,564	5,297	4,162
Net Charge- Offs	(12,660)	(9,885)	(20,574)	(15,790)
Provision for credit losses	17,538	16,384	28,875	29,224
Balance at End of Period	159,092	148,719	159,092	148,719
Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,568	5,580	7,268	6,727
Charge- Offs	(75)	(465)	(557)	(846)
Recoveries	896	279	1,165	585
Net Charge- Offs	821	(186)	608	(261)
Provision for credit losses	(782)	256	(1,269)	(816)
Balance at End of Period	6,607	5,650	6,607	5,650
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	46,389	43,898	46,635	41,741
Charge- Offs	(318)	(666)	(1,306)	(2,035)
Recoveries	505	1,109	866	1,706
Net Charge- Offs	187	443	(440)	(329)
Provision for credit losses	382	87	763	3,016
Balance at End of Period	46,958	44,428	46,958	44,428
Commercial Real Estate [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			4,538
Balance at End of Period	3,626		3,626
Commercial and Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	53,570	47,863	47,991	41,023
Charge- Offs	(7,736)	(5,671)	(10,199)	(5,969)
Recoveries	183	190	657	380
Net Charge- Offs	(7,553)	(5,481)	(9,542)	(5,589)
Provision for credit losses	8,091	9,093	15,659	16,041
Balance at End of Period	54,108	51,475	54,108	51,475
Commercial and Industrial [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			500
Balance at End of Period	108		108
Commercial Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	3,513	2,818	3,280	2,541
Charge- Offs	(208)	(603)	(714)	(717)
Recoveries	3	32	4	46
Net Charge- Offs	(205)	(571)	(710)	(671)
Provision for credit losses	814	800	1,552	1,177
Balance at End of Period	4,122	3,047	4,122	3,047
Total Commercial Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	103,472	94,579	97,906	85,305
Charge- Offs	(8,262)	(6,940)	(12,219)	(8,721)
Recoveries	691	1,331	1,527	2,132
Net Charge- Offs	(7,571)	(5,609)	(10,692)	(6,589)
Provision for credit losses	9,287	9,980	17,974	20,234
Balance at End of Period	105,188	98,950	105,188	98,950
Total Commercial Loans and Leases [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			5,038
Balance at End of Period	3,734		3,734
Direct Installment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	20,210	20,725	21,391	21,587
Charge- Offs	(3,245)	(2,421)	(6,119)	(5,088)
Recoveries	581	454	1,209	908
Net Charge- Offs	(2,664)	(1,967)	(4,910)	(4,180)
Provision for credit losses	3,190	2,785	4,255	4,136
Balance at End of Period	20,736	21,543	20,736	21,543
Direct Installment [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			1,005
Balance at End of Period	1,037		1,037
Residential Mortgages [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	10,210	7,810	10,082	7,909
Charge- Offs	(182)	(72)	(362)	(157)
Recoveries	10	38	171	57
Net Charge- Offs	(172)	(34)	(191)	(100)
Provision for credit losses	1,214	634	1,361	601
Balance at End of Period	11,252	8,410	11,252	8,410
Residential Mortgages [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			632
Balance at End of Period	753		753
Indirect Installment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	9,630	9,065	10,564	9,889
Charge- Offs	(1,966)	(1,763)	(4,336)	(3,705)
Recoveries	614	666	1,395	928
Net Charge- Offs	(1,352)	(1,097)	(2,941)	(2,777)
Provision for credit losses	2,296	1,575	2,951	2,431
Balance at End of Period	10,574	9,543	10,574	9,543
Indirect Installment [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			221
Balance at End of Period	221		221
Consumer Lines of Credit [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	8,883	8,967	9,456	9,582
Charge- Offs	(583)	(528)	(1,041)	(1,002)
Recoveries	150	49	315	105
Net Charge- Offs	(433)	(479)	(726)	(897)
Provision for credit losses	1,054	661	774	464
Balance at End of Period	9,504	9,149	9,504	9,149
Consumer Lines of Credit [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			372
Balance at End of Period	862		862
Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	1,809	1,074	1,392	1,013
Charge- Offs	(821)	(725)	(1,794)	(1,279)
Recoveries	353	26	680	32
Net Charge- Offs	(468)	(699)	(1,114)	(1,247)
Provision for credit losses	497	749	1,560	1,358
Balance at End of Period	1,838	1,124	1,838	1,124
Purchased Credit-Impaired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	660	704	572	834
Charge- Offs	(1)	(239)	(1)	(399)
Recoveries	0	0	0	0
Net Charge- Offs	(1)	(239)	(1)	(399)
Provision for credit losses	(19)	167	69	197
Balance at End of Period	640	632	640	632
Other Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	5,908	4,876	6,696	5,893
Charge- Offs	(74)	(226)	(556)	(447)
Recoveries	896	279	1,165	585
Net Charge- Offs	822	53	609	138
Provision for credit losses	(763)	89	(1,338)	(1,013)
Balance at End of Period	$ 5,967	$ 5,018	$ 5,967	$ 5,018