ALLOWANCE FOR CREDIT LOSSES - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	$ 179,247	$ 160,782	$ 175,380	$ 158,059
Charge- Offs	(22,630)	(15,134)	(36,541)	(26,428)
Recoveries	4,403	3,295	7,686	6,462
Net Charge- Offs	(18,227)	(11,839)	(28,855)	(19,966)
Provision for credit losses	15,554	16,756	30,049	27,606
Balance at End of Period	176,574	165,699	176,574	165,699
Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	172,410	154,214	168,682	150,791
Charge- Offs	(18,554)	(15,059)	(32,156)	(25,871)
Recoveries	3,723	2,399	6,283	5,297
Net Charge- Offs	(14,831)	(12,660)	(25,873)	(20,574)
Provision for credit losses	15,036	17,538	29,806	28,875
Balance at End of Period	172,615	159,092	172,615	159,092
Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,837	6,568	6,698	7,268
Charge- Offs	(4,076)	(75)	(4,385)	(557)
Recoveries	680	896	1,403	1,165
Net Charge- Offs	(3,396)	821	(2,982)	608
Provision for credit losses	518	(782)	243	(1,269)
Balance at End of Period	3,959	6,607	3,959	6,607
Commercial Real Estate [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	53,516	46,389	50,281	46,635
Charge- Offs	(4,254)	(318)	(4,479)	(1,306)
Recoveries	765	505	1,102	866
Net Charge- Offs	(3,489)	187	(3,377)	(440)
Provision for credit losses	560	382	3,683	763
Balance at End of Period	50,587	46,958	50,587	46,958
Commercial Real Estate [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			4,976
Balance at End of Period	2,892		2,892
Commercial and Industrial [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	53,013	53,570	51,963	47,991
Charge- Offs	(6,127)	(7,736)	(12,047)	(10,199)
Recoveries	1,157	183	1,526	657
Net Charge- Offs	(4,970)	(7,553)	(10,521)	(9,542)
Provision for credit losses	5,646	8,091	12,247	15,659
Balance at End of Period	53,689	54,108	53,689	54,108
Commercial and Industrial [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			(415)
Balance at End of Period	78		78
Commercial Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,115	3,513	5,646	3,280
Charge- Offs	(36)	(208)	(207)	(714)
Recoveries	14	3	24	4
Net Charge- Offs	(22)	(205)	(183)	(710)
Provision for credit losses	946	814	1,576	1,552
Balance at End of Period	7,039	4,122	7,039	4,122
Other [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	1,995	1,809	1,843	1,392
Charge- Offs	(1,578)	(821)	(2,375)	(1,794)
Recoveries	272	353	569	680
Net Charge- Offs	(1,306)	(468)	(1,806)	(1,114)
Provision for credit losses	1,307	497	1,959	1,560
Balance at End of Period	1,996	1,838	1,996	1,838
Total Commercial Loans and Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	114,639	105,281	109,733	99,298
Charge- Offs	(11,995)	(9,083)	(19,108)	(14,013)
Recoveries	2,208	1,044	3,221	2,207
Net Charge- Offs	(9,787)	(8,039)	(15,887)	(11,806)
Provision for credit losses	8,459	9,784	19,465	19,534
Balance at End of Period	113,311	107,026	113,311	107,026
Total Commercial Loans and Leases [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			4,561
Balance at End of Period	2,970		2,970
Direct Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	20,128	20,210	20,936	21,391
Charge- Offs	(2,922)	(3,245)	(6,392)	(6,119)
Recoveries	463	581	903	1,209
Net Charge- Offs	(2,459)	(2,664)	(5,489)	(4,910)
Provision for credit losses	2,610	3,190	4,832	4,255
Balance at End of Period	20,279	20,736	20,279	20,736
Direct Installment [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			1,553
Balance at End of Period	562		562
Residential Mortgages [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	15,280	10,210	15,507	10,082
Charge- Offs	(314)	(182)	(393)	(362)
Recoveries	16	10	107	171
Net Charge- Offs	(298)	(172)	(286)	(191)
Provision for credit losses	181	1,214	(58)	1,361
Balance at End of Period	15,163	11,252	15,163	11,252
Residential Mortgages [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			484
Balance at End of Period	191		191
Indirect Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	11,955	9,630	11,967	10,564
Charge- Offs	(2,218)	(1,966)	(4,627)	(4,336)
Recoveries	974	614	1,869	1,395
Net Charge- Offs	(1,244)	(1,352)	(2,758)	(2,941)
Provision for credit losses	2,690	2,296	4,192	2,951
Balance at End of Period	13,401	10,574	13,401	10,574
Indirect Installment [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			177
Balance at End of Period	250		250
Consumer Lines of Credit [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	10,408	8,883	10,539	9,456
Charge- Offs	(1,105)	(583)	(1,636)	(1,041)
Recoveries	62	150	183	315
Net Charge- Offs	(1,043)	(433)	(1,453)	(726)
Provision for credit losses	1,096	1,054	1,375	774
Balance at End of Period	10,461	9,504	10,461	9,504
Consumer Lines of Credit [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			(77)
Balance at End of Period	(14)		(14)
Consumer Loan [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	57,771	48,933	58,949	51,493
Charge- Offs	(6,559)	(5,976)	(13,048)	(11,858)
Recoveries	1,515	1,355	3,062	3,090
Net Charge- Offs	(5,044)	(4,621)	(9,986)	(8,768)
Provision for credit losses	6,577	7,754	10,341	9,341
Balance at End of Period	59,304	52,066	59,304	52,066
Consumer Loan [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period			2,137
Balance at End of Period	989		989
Purchased Credit-Impaired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	622	660	635	572
Charge- Offs	0	(1)	0	(1)
Recoveries	0	0	0	0
Net Charge- Offs	0	(1)	0	(1)
Provision for credit losses	2	(19)	(11)	69
Balance at End of Period	624	640	624	640
Other Acquired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,215	5,908	6,063	6,696
Charge- Offs	(4,076)	(74)	(4,385)	(556)
Recoveries	680	896	1,403	1,165
Net Charge- Offs	(3,396)	822	(2,982)	609
Provision for credit losses	516	(763)	254	(1,338)
Balance at End of Period	$ 3,335	$ 5,967	$ 3,335	$ 5,967