CREDIT QUALITY ASSESSMENT (Credit Quality of Loan Portfolio) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	$ 19,363	$ 14,762
Non-accrual loans and leases	29,203	29,211
Current loans	4,084,605	3,883,835
Total loans and leases	4,133,171	3,927,808
Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	5,171	1,335
Non-accrual loans and leases	6,807	5,833
Current loans	439,592	460,118
Total loans and leases	451,570	467,286
Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	1,216	1,912
Non-accrual loans and leases	3,111	2,859
Current loans	453,731	451,886
Total loans and leases	458,058	456,657
Commercial Real Estate Portfolio Segment
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	2,633,446
Commercial Real Estate Portfolio Segment | Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total loans and leases	451,570
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	314,122	307,246
Total loans and leases	314,259	308,279
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	400	2,056
Non-accrual loans and leases	6,934	8,107
Current loans	1,062,654	917,950
Total loans and leases	1,069,988	928,113
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	1,308	2,223
Non-accrual loans and leases	4,926	4,823
Current loans	791,395	768,506
Total loans and leases	797,629	775,552
Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	11,268	6,340
Non-accrual loans and leases	7,101	7,257
Current loans	853,397	828,095
Total loans and leases	871,766	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	187	195
Current loans	169,714	150,034
Total loans and leases	169,901	150,229
31-60 days
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	15,495	8,665
31-60 days | Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	4,980	663
31-60 days | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	1,071	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	219	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	580	1,479
31-60 days | Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	8,645	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	3,440	5,865
61-90 days | Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	191	672
61-90 days | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	141	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	181	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	304	744
61-90 days | Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	2,623	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	428	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	4	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	424	0
> 90 days | Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	232
> 90 days | Residential Real Estate Portfolio Segment | Residential Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	$ 0	$ 0