ALLOWANCE FOR CREDIT LOSSES - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	$ 165,699	$ 154,369	$ 158,059	$ 142,012
Charge- Offs	(15,335)	(16,187)	(41,763)	(36,985)
Recoveries	2,884	4,073	9,346	8,820
Net Charge- Offs	(12,451)	(12,114)	(32,417)	(28,165)
Provision for credit losses	16,768	14,639	44,374	43,047
Balance at End of Period	170,016	156,894	170,016	156,894
Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	159,092	148,719	150,791	135,285
Charge- Offs	(15,092)	(15,947)	(40,963)	(35,899)
Recoveries	2,059	3,669	7,356	7,831
Net Charge- Offs	(13,033)	(12,278)	(33,607)	(28,068)
Provision for credit losses	17,175	14,072	46,050	43,296
Balance at End of Period	163,234	150,513	163,234	150,513
Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,607	5,650	7,268	6,727
Charge- Offs	(243)	(240)	(800)	(1,086)
Recoveries	825	404	1,990	989
Net Charge- Offs	582	164	1,190	(97)
Provision for credit losses	(407)	567	(1,676)	(249)
Balance at End of Period	6,782	6,381	6,782	6,381
Commercial Real Estate [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	46,958	44,428	46,635	41,741
Charge- Offs	(610)	(3,537)	(1,916)	(5,572)
Recoveries	93	1,810	959	3,516
Net Charge- Offs	(517)	(1,727)	(957)	(2,056)
Provision for credit losses	1,682	(334)	2,445	2,682
Balance at End of Period	48,123	42,367	48,123	42,367
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	4,242		4,242
Commercial and Industrial [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	54,108	51,475	47,991	41,023
Charge- Offs	(6,592)	(6,753)	(16,791)	(12,722)
Recoveries	298	598	955	978
Net Charge- Offs	(6,294)	(6,155)	(15,836)	(11,744)
Provision for credit losses	5,889	8,388	21,548	24,429
Balance at End of Period	53,703	53,708	53,703	53,708
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	0		0
Commercial Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	4,122	3,047	3,280	2,541
Charge- Offs	(112)	(100)	(826)	(817)
Recoveries	1	3	5	49
Net Charge- Offs	(111)	(97)	(821)	(768)
Provision for credit losses	818	257	2,370	1,434
Balance at End of Period	4,829	3,207	4,829	3,207
Total Commercial Loans and Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	105,188	98,950	97,906	85,305
Charge- Offs	(7,314)	(10,390)	(19,533)	(19,111)
Recoveries	392	2,411	1,919	4,543
Net Charge- Offs	(6,922)	(7,979)	(17,614)	(14,568)
Provision for credit losses	8,389	8,311	26,363	28,545
Balance at End of Period	106,655	99,282	106,655	99,282
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	4,242		4,242
Direct Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	20,736	21,543	21,391	21,587
Charge- Offs	(3,247)	(2,464)	(9,366)	(7,552)
Recoveries	402	545	1,611	1,453
Net Charge- Offs	(2,845)	(1,919)	(7,755)	(6,099)
Provision for credit losses	2,786	1,463	7,041	5,599
Balance at End of Period	20,677	21,087	20,677	21,087
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	1,637		1,637
Residential Mortgages [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	11,252	8,410	10,082	7,909
Charge- Offs	(155)	(144)	(517)	(301)
Recoveries	8	11	179	68
Net Charge- Offs	(147)	(133)	(338)	(233)
Provision for credit losses	1,630	969	2,991	1,570
Balance at End of Period	12,735	9,246	12,735	9,246
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	647		647
Indirect Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	10,574	9,543	10,564	9,889
Charge- Offs	(2,468)	(1,781)	(6,804)	(5,486)
Recoveries	861	617	2,256	1,545
Net Charge- Offs	(1,607)	(1,164)	(4,548)	(3,941)
Provision for credit losses	2,380	1,983	5,331	4,414
Balance at End of Period	11,347	10,362	11,347	10,362
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	213		213
Consumer Lines of Credit [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	9,504	9,149	9,456	9,582
Charge- Offs	(522)	(459)	(1,563)	(1,461)
Recoveries	98	82	413	187
Net Charge- Offs	(424)	(377)	(1,150)	(1,274)
Provision for credit losses	972	499	1,746	963
Balance at End of Period	10,052	9,271	10,052	9,271
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	43		43
Other [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	1,838	1,124	1,392	1,013
Charge- Offs	(1,386)	(709)	(3,180)	(1,988)
Recoveries	298	3	978	35
Net Charge- Offs	(1,088)	(706)	(2,202)	(1,953)
Provision for credit losses	1,018	847	2,578	2,205
Balance at End of Period	1,768	1,265	1,768	1,265
Purchased Credit-Impaired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	640	632	572	834
Charge- Offs	(21)	0	(22)	(399)
Recoveries	34	42	34	42
Net Charge- Offs	13	42	12	(357)
Provision for credit losses	137	(102)	206	95
Balance at End of Period	790	572	790	572
Other Acquired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	5,967	5,018	6,696	5,893
Charge- Offs	(222)	(240)	(778)	(687)
Recoveries	791	362	1,956	947
Net Charge- Offs	569	122	1,178	260
Provision for credit losses	(544)	669	(1,882)	(344)
Balance at End of Period	$ 5,992	$ 5,809	$ 5,992	$ 5,809