ALLOWANCE FOR CREDIT LOSSES - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	$ 175,380	$ 158,059
Charge- Offs	(13,911)	(11,294)
Recoveries	3,283	3,167
Net Charge- Offs	(10,628)	(8,127)
Provision for credit losses	14,495	10,850
Balance at End of Period	179,247	160,782
Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	168,682	150,791
Charge- Offs	(13,602)	(10,812)
Recoveries	2,560	2,898
Net Charge- Offs	(11,042)	(7,914)
Provision for credit losses	14,770	11,337
Balance at End of Period	172,410	154,214
Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,698	7,268
Charge- Offs	(309)	(482)
Recoveries	723	269
Net Charge- Offs	414	(213)
Provision for credit losses	(275)	(487)
Balance at End of Period	6,837	6,568
Commercial Real Estate [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	50,281	46,635
Charge- Offs	(225)	(988)
Recoveries	337	361
Net Charge- Offs	112	(627)
Provision for credit losses	3,123	381
Balance at End of Period	53,516	46,389
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	2,732
Commercial and Industrial [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	51,963	47,991
Charge- Offs	(5,920)	(2,463)
Recoveries	369	474
Net Charge- Offs	(5,551)	(1,989)
Provision for credit losses	6,601	7,568
Balance at End of Period	53,013	53,570
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	1,785
Commercial Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	5,646	3,280
Charge- Offs	(171)	(506)
Recoveries	10	1
Net Charge- Offs	(161)	(505)
Provision for credit losses	630	738
Balance at End of Period	6,115	3,513
Other [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	1,843	1,392
Charge- Offs	(797)	(973)
Recoveries	297	327
Net Charge- Offs	(500)	(646)
Provision for credit losses	652	1,063
Balance at End of Period	1,995	1,809
Total Commercial Loans and Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	109,733	99,298
Charge- Offs	(7,113)	(4,930)
Recoveries	1,013	1,163
Net Charge- Offs	(6,100)	(3,767)
Provision for credit losses	11,006	9,750
Balance at End of Period	114,639	105,281
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	4,517
Direct Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	20,936	21,391
Charge- Offs	(3,470)	(2,874)
Recoveries	440	628
Net Charge- Offs	(3,030)	(2,246)
Provision for credit losses	2,222	1,065
Balance at End of Period	20,128	20,210
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	1,804
Residential Mortgages [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	15,507	10,082
Charge- Offs	(79)	(180)
Recoveries	91	161
Net Charge- Offs	12	(19)
Provision for credit losses	(239)	147
Balance at End of Period	15,280	10,210
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	518
Indirect Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	11,967	10,564
Charge- Offs	(2,409)	(2,370)
Recoveries	895	781
Net Charge- Offs	(1,514)	(1,589)
Provision for credit losses	1,502	655
Balance at End of Period	11,955	9,630
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	240
Consumer Lines of Credit [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	10,539	9,456
Charge- Offs	(531)	(458)
Recoveries	121	165
Net Charge- Offs	(410)	(293)
Provision for credit losses	279	(280)
Balance at End of Period	10,408	8,883
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	(242)
Consumer Loan [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	58,949	51,493
Charge- Offs	(6,489)	(5,882)
Recoveries	1,547	1,735
Net Charge- Offs	(4,942)	(4,147)
Provision for credit losses	3,764	1,587
Balance at End of Period	57,771	48,933
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	2,320
Purchased Credit-Impaired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	635	572
Charge- Offs	0	0
Recoveries	0	0
Net Charge- Offs	0	0
Provision for credit losses	(13)	88
Balance at End of Period	622	660
Other Acquired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,063	6,696
Charge- Offs	(309)	(482)
Recoveries	723	269
Net Charge- Offs	414	(213)
Provision for credit losses	(262)	(575)
Balance at End of Period	$ 6,215	$ 5,908