CREDIT QUALITY ASSESSMENT (Credit Quality of Loan Portfolio) (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	$ 13,508	$ 14,762
Non-accrual loans and leases	28,217	29,211
Current loans	3,951,271	3,883,835
Total loans and leases	3,992,996	3,927,808
Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	5,742	1,335
Non-accrual loans and leases	4,849	5,833
Current loans	446,625	460,118
Total loans and leases	457,216	467,286
Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	994	1,912
Non-accrual loans and leases	3,058	2,859
Current loans	451,426	451,886
Total loans and leases	455,478	456,657
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	896
Non-accrual loans and leases	137	137
Current loans	309,213	307,246
Total loans and leases	309,350	308,279
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	2,056
Non-accrual loans and leases	7,970	8,107
Current loans	971,440	917,950
Total loans and leases	979,410	928,113
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	520	2,223
Non-accrual loans and leases	5,106	4,823
Current loans	766,817	768,506
Total loans and leases	772,443	775,552
Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	6,252	6,340
Non-accrual loans and leases	6,908	7,257
Current loans	835,654	828,095
Total loans and leases	848,814	841,692
Residential Real Estate Portfolio Segment | Residential Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	0
Non-accrual loans and leases	189	195
Current loans	170,096	150,034
Total loans and leases	170,285	150,229
31-60 days
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	11,725	8,665
31-60 days | Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	5,140	663
31-60 days | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	586	808
31-60 days | Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	896
31-60 days | Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	850
31-60 days | Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	252	1,479
31-60 days | Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	5,747	3,969
31-60 days | Residential Real Estate Portfolio Segment | Residential Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	0
61-90 days
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	1,551	5,865
61-90 days | Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	602	672
61-90 days | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	408	1,104
61-90 days | Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	0
61-90 days | Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	1,206
61-90 days | Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	268	744
61-90 days | Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	273	2,139
61-90 days | Residential Real Estate Portfolio Segment | Residential Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	0
> 90 days
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	232	232
> 90 days | Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	0
> 90 days | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	0
> 90 days | Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	0
> 90 days | Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	0
> 90 days | Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	0
> 90 days | Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	232	232
> 90 days | Residential Real Estate Portfolio Segment | Residential Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	$ 0	$ 0