CREDIT QUALITY ASSESSMENT (Credit Quality of Loan Portfolio) (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	$ 27,748	$ 27,235
Non-accrual loans	38,632	33,583
Loans aquired with deteriorated credit quality	12,700	26,000	$ 41,900
Current loans	6,625,768	6,484,869
Total loans	6,705,232	6,571,634
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans aquired with deteriorated credit quality	13,084	25,947
Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	1,278	2,786
Non-accrual loans	8,450	7,086
Current loans	788,752	778,237
Total loans	801,019	796,264
Commercial | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans aquired with deteriorated credit quality	2,539	8,155
Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	4,214	5,567
Non-accrual loans	4,107	4,107
Current loans	457,450	506,893
Total loans	466,764	517,839
Consumer | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans aquired with deteriorated credit quality	993	1,272
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	474
Non-accrual loans	829	3,306
Current loans	683,181	677,421
Total loans	684,010	681,201
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans aquired with deteriorated credit quality	0	0
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	932	3,830
Non-accrual loans	8,437	5,355
Current loans	2,150,243	1,934,882
Total loans	2,169,156	1,958,395
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans aquired with deteriorated credit quality	9,544	14,328
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	316	433
Non-accrual loans	4,148	4,234
Current loans	1,284,213	1,196,054
Total loans	1,288,677	1,202,903
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans aquired with deteriorated credit quality	0	2,182
Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	19,394	10,919
Non-accrual loans	12,661	9,336
Current loans	1,117,264	1,207,982
Total loans	1,149,327	1,228,247
Residential Real Estate Portfolio Segment | Residential Mortgage | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans aquired with deteriorated credit quality	8	10
Residential Real Estate Portfolio Segment | Residential Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	1,614	3,226
Non-accrual loans	0	159
Current loans	144,665	183,400
Total loans	146,279	186,785
Residential Real Estate Portfolio Segment | Residential Construction | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable Recorded Investment Past Due [Line Items]
Loans aquired with deteriorated credit quality	0	0
31-60 days
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	19,986	21,963
31-60 days | Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	908	2,737
31-60 days | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	2,697	3,871
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	474
31-60 days | Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	932	3,041
31-60 days | Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	316	433
31-60 days | Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	14,853	8,181
31-60 days | Residential Real Estate Portfolio Segment | Residential Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	280	3,226
61-90 days
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	7,762	4,783
61-90 days | Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	370	0
61-90 days | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	1,517	1,477
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	789
61-90 days | Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	0
61-90 days | Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	4,541	2,517
61-90 days | Residential Real Estate Portfolio Segment | Residential Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	1,334	0
> 90 days
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	489
> 90 days | Commercial
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	49
> 90 days | Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	0	219
> 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	0	221
> 90 days | Residential Real Estate Portfolio Segment | Residential Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Total past due	$ 0	$ 0