ALLOWANCE FOR CREDIT LOSSES - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	$ 176,574	$ 165,699	$ 175,380	$ 158,059
Charge- Offs	(17,247)	(15,335)	(53,788)	(41,763)
Recoveries	2,579	2,884	10,265	9,346
Net Charge- Offs	(14,668)	(12,451)	(43,523)	(32,417)
Provision for credit losses	15,975	16,768	46,024	44,374
Balance at End of Period	177,881	170,016	177,881	170,016
Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	172,615	159,092	168,682	150,791
Charge- Offs	(16,534)	(15,092)	(48,690)	(40,963)
Recoveries	2,377	2,059	8,660	7,356
Net Charge- Offs	(14,157)	(13,033)	(40,030)	(33,607)
Provision for credit losses	14,853	17,175	44,659	46,050
Balance at End of Period	173,311	163,234	173,311	163,234
Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	3,959	6,607	6,698	7,268
Charge- Offs	(713)	(243)	(5,098)	(800)
Recoveries	202	825	1,605	1,990
Net Charge- Offs	(511)	582	(3,493)	1,190
Provision for credit losses	1,122	(407)	1,365	(1,676)
Balance at End of Period	4,570	6,782	4,570	6,782
Commercial Real Estate [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	50,587	46,958	50,281	46,635
Charge- Offs	(727)	(610)	(5,206)	(1,916)
Recoveries	567	93	1,669	959
Net Charge- Offs	(160)	(517)	(3,537)	(957)
Provision for credit losses	4,256	1,682	7,939	2,445
Balance at End of Period	54,683	48,123	54,683	48,123
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	2,440		2,440
Commercial and Industrial [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	53,689	54,108	51,963	47,991
Charge- Offs	(2,432)	(6,592)	(14,479)	(16,791)
Recoveries	373	298	1,899	955
Net Charge- Offs	(2,059)	(6,294)	(12,580)	(15,836)
Provision for credit losses	906	5,889	13,153	21,548
Balance at End of Period	52,536	53,703	52,536	53,703
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	639		639
Commercial Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	7,039	4,122	5,646	3,280
Charge- Offs	(51)	(112)	(258)	(826)
Recoveries	2	1	26	5
Net Charge- Offs	(49)	(111)	(232)	(821)
Provision for credit losses	510	818	2,086	2,370
Balance at End of Period	7,500	4,829	7,500	4,829
Other [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	1,996	1,838	1,843	1,392
Charge- Offs	(918)	(1,386)	(3,293)	(3,180)
Recoveries	274	298	843	978
Net Charge- Offs	(644)	(1,088)	(2,450)	(2,202)
Provision for credit losses	726	1,018	2,685	2,578
Balance at End of Period	2,078	1,768	2,078	1,768
Total Commercial Loans and Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	113,311	107,026	109,733	99,298
Charge- Offs	(4,128)	(8,700)	(23,236)	(22,713)
Recoveries	1,216	690	4,437	2,897
Net Charge- Offs	(2,912)	(8,010)	(18,799)	(19,816)
Provision for credit losses	6,398	9,407	25,863	28,941
Balance at End of Period	116,797	108,423	116,797	108,423
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	3,079		3,079
Direct Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	20,279	20,736	20,936	21,391
Charge- Offs	(9,436)	(3,247)	(15,828)	(9,366)
Recoveries	276	402	1,179	1,611
Net Charge- Offs	(9,160)	(2,845)	(14,649)	(7,755)
Provision for credit losses	2,714	2,786	7,546	7,041
Balance at End of Period	13,833	20,677	13,833	20,677
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	967		967
Residential Mortgages [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	15,163	11,252	15,507	10,082
Charge- Offs	(77)	(155)	(470)	(517)
Recoveries	7	8	114	179
Net Charge- Offs	(70)	(147)	(356)	(338)
Provision for credit losses	2,576	1,630	2,518	2,991
Balance at End of Period	17,669	12,735	17,669	12,735
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	520		520
Indirect Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	13,401	10,574	11,967	10,564
Charge- Offs	(2,061)	(2,468)	(6,688)	(6,804)
Recoveries	620	861	2,489	2,256
Net Charge- Offs	(1,441)	(1,607)	(4,199)	(4,548)
Provision for credit losses	2,493	2,380	6,685	5,331
Balance at End of Period	14,453	11,347	14,453	11,347
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	226		226
Consumer Lines of Credit [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	10,461	9,504	10,539	9,456
Charge- Offs	(832)	(522)	(2,468)	(1,563)
Recoveries	258	98	441	413
Net Charge- Offs	(574)	(424)	(2,027)	(1,150)
Provision for credit losses	672	972	2,047	1,746
Balance at End of Period	10,559	10,052	10,559	10,052
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	(222)		(222)
Consumer Loan [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	59,304	52,066	58,949	51,493
Charge- Offs	(12,406)	(6,392)	(25,454)	(18,250)
Recoveries	1,161	1,369	4,223	4,459
Net Charge- Offs	(11,245)	(5,023)	(21,231)	(13,791)
Provision for credit losses	8,455	7,768	18,796	17,109
Balance at End of Period	56,514	54,811	56,514	54,811
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	1,491		1,491
Purchased Credit-Impaired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	624	640	635	572
Charge- Offs	0	(21)	0	(22)
Recoveries	0	34	0	34
Net Charge- Offs	0	13	0	12
Provision for credit losses	0	137	(11)	206
Balance at End of Period	624	790	624	790
Other Acquired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	3,335	5,967	6,063	6,696
Charge- Offs	(713)	(222)	(5,098)	(778)
Recoveries	202	791	1,605	1,956
Net Charge- Offs	(511)	569	(3,493)	1,178
Provision for credit losses	1,122	(544)	1,376	(1,882)
Balance at End of Period	$ 3,946	$ 5,992	$ 3,946	$ 5,992