LOANS AND LEASES - Impaired Loans and Lease (Detail) - Originated Loans and Leases [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	$ 104,434	$ 106,476
Recorded Investment With No Specific Reserve	81,457	74,309
Recorded Investment With Specific Reserve	6,758	7,363
Total Recorded Investment	88,215	81,672
Specific Reserve	3,250	3,654
Average Recorded Investment	87,009	88,636
Commercial Real Estate [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	30,584	27,718
Recorded Investment With No Specific Reserve	25,478	21,748
Recorded Investment With Specific Reserve	1,751	2,906
Total Recorded Investment	27,229	24,654
Specific Reserve	305	439
Average Recorded Investment	25,988	24,413
Commercial and Industrial [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	26,034	29,307
Recorded Investment With No Specific Reserve	15,859	11,595
Recorded Investment With Specific Reserve	5,007	4,457
Total Recorded Investment	20,866	16,052
Specific Reserve	2,945	3,215
Average Recorded Investment	20,479	23,907
Commercial Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	1,399	1,574
Recorded Investment With No Specific Reserve	1,399	1,574
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	1,399	1,574
Specific Reserve	0	0
Average Recorded Investment	1,486	1,386
Other [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	0	0
Recorded Investment With No Specific Reserve	0	0
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	0	0
Specific Reserve	0	0
Average Recorded Investment	0	0
Total Commercial Loans and Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	58,017	58,599
Recorded Investment With No Specific Reserve	42,736	34,917
Recorded Investment With Specific Reserve	6,758	7,363
Total Recorded Investment	49,494	42,280
Specific Reserve	3,250	3,654
Average Recorded Investment	47,953	49,706
Direct Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	18,623	19,375
Recorded Investment With No Specific Reserve	15,653	16,653
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	15,653	16,653
Specific Reserve	0	0
Average Recorded Investment	16,153	16,852
Residential Mortgages [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	17,448	17,754
Recorded Investment With No Specific Reserve	16,134	16,410
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	16,134	16,410
Specific Reserve	0	0
Average Recorded Investment	16,272	15,984
Indirect Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	4,648	5,709
Recorded Investment With No Specific Reserve	2,424	2,435
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	2,424	2,435
Specific Reserve	0	0
Average Recorded Investment	2,429	2,279
Consumer Lines of Credit [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	5,698	5,039
Recorded Investment With No Specific Reserve	4,510	3,894
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	4,510	3,894
Specific Reserve	0	0
Average Recorded Investment	4,202	3,815
Consumer Loan [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	46,417	47,877
Recorded Investment With No Specific Reserve	38,721	39,392
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	38,721	39,392
Specific Reserve	0	0
Average Recorded Investment	$ 39,056	$ 38,930