LOANS AND LEASES - Impaired Loans and Lease (Detail) - Originated Loans and Leases [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	$ 103,572	$ 106,476
Recorded Investment With No Specific Reserve	80,865	74,309
Recorded Investment With Specific Reserve	8,907	7,363
Total Recorded Investment	89,772	81,672
Specific Reserve	4,756	3,654
Average Recorded Investment	86,286	88,636
Commercial Real Estate [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	20,051	27,718
Recorded Investment With No Specific Reserve	17,576	21,748
Recorded Investment With Specific Reserve	635	2,906
Total Recorded Investment	18,211	24,654
Specific Reserve	44	439
Average Recorded Investment	16,360	24,413
Commercial and Industrial [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	31,219	29,307
Recorded Investment With No Specific Reserve	19,533	11,595
Recorded Investment With Specific Reserve	8,272	4,457
Total Recorded Investment	27,805	16,052
Specific Reserve	4,712	3,215
Average Recorded Investment	27,096	23,907
Commercial Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	5,526	1,574
Recorded Investment With No Specific Reserve	5,526	1,574
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	5,526	1,574
Specific Reserve	0	0
Average Recorded Investment	3,372	1,386
Total Commercial Loans and Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	56,796	58,599
Recorded Investment With No Specific Reserve	42,635	34,917
Recorded Investment With Specific Reserve	8,907	7,363
Total Recorded Investment	51,542	42,280
Specific Reserve	4,756	3,654
Average Recorded Investment	46,828	49,706
Direct Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	17,554	19,375
Recorded Investment With No Specific Reserve	14,589	16,653
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	14,589	16,653
Specific Reserve	0	0
Average Recorded Investment	15,191	16,852
Residential Mortgages [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	17,316	17,754
Recorded Investment With No Specific Reserve	16,006	16,410
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	16,006	16,410
Specific Reserve	0	0
Average Recorded Investment	16,887	15,984
Indirect Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	4,576	5,709
Recorded Investment With No Specific Reserve	2,263	2,435
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	2,263	2,435
Specific Reserve	0	0
Average Recorded Investment	2,208	2,279
Consumer Lines of Credit [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	7,330	5,039
Recorded Investment With No Specific Reserve	5,372	3,894
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	5,372	3,894
Specific Reserve	0	0
Average Recorded Investment	5,172	3,815
Consumer Loan [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	46,776	47,877
Recorded Investment With No Specific Reserve	38,230	39,392
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	38,230	39,392
Specific Reserve	0	0
Average Recorded Investment	$ 39,458	$ 38,930