CREDIT QUALITY ASSESSMENT (Recorded Investment with Respect to Impaired loans, Associated Allowance by Applicable Portfolio Segment and Principal Balance of Impaired Loans prior to Amounts Charged-off) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	$ 12,876	$ 11,693	$ 13,563
Impaired loans without a specific allowance	9,334	9,116	10,529
Impaired loans	22,210	20,809	$ 24,092
Impaired Financing Receivable, Related Allowance	4,924	4,014
Unpaid principal balance in total impaired loans	35,121	32,689
Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	10,010	9,673
Impaired loans without a specific allowance	4,844	2,127
Impaired loans	14,854	11,800
Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	328	1,129
Impaired loans without a specific allowance	1,614	1,659
Impaired loans	1,942	2,788
Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	2,538	891
Impaired loans without a specific allowance	2,876	5,330
Impaired loans	5,414	6,221
Commercial
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	6,220	5,753
Impaired loans without a specific allowance	1,366	2,352
Impaired loans	7,586	8,105
Impaired Financing Receivable, Related Allowance	3,594	3,220
Unpaid principal balance in total impaired loans	11,056	11,263
Commercial | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	4,126	4,516
Impaired loans without a specific allowance	220	391
Impaired loans	4,346	4,907
Commercial | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	328	1,129
Impaired loans without a specific allowance	172	273
Impaired loans	500	1,402
Commercial | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	1,766	108
Impaired loans without a specific allowance	974	1,688
Impaired loans	2,740	1,796
All Other
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	1,729	2,915
Impaired loans	1,729	2,915
Impaired Financing Receivable, Related Allowance	0	0
Unpaid principal balance in total impaired loans	3,081	3,681
All Other | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	0	0
Impaired loans	0	0
All Other | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	1,442	890
Impaired loans	1,442	890
All Other | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	287	2,025
Impaired loans	287	2,025
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	3,306	136
Impaired loans	3,306	136
Impaired Financing Receivable, Related Allowance	0	0
Unpaid principal balance in total impaired loans	4,419	1,248
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	3,170	0
Impaired loans	3,170	0
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	0	0
Impaired loans	0	0
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	136	136
Impaired loans	136	136
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	5,117	5,157
Impaired loans without a specific allowance	238	418
Impaired loans	5,355	5,575
Impaired Financing Receivable, Related Allowance	1,207	663
Unpaid principal balance in total impaired loans	9,909	10,166
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	5,117	5,157
Impaired loans without a specific allowance	238	418
Impaired loans	5,355	5,575
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	0	0
Impaired loans	0	0
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	0	0
Impaired loans	0	0
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	1,539	783
Impaired loans without a specific allowance	2,695	3,295
Impaired loans	4,234	4,078
Impaired Financing Receivable, Related Allowance	123	131
Unpaid principal balance in total impaired loans	6,656	6,331
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	767	0
Impaired loans without a specific allowance	1,216	1,318
Impaired loans	1,983	1,318
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	0	496
Impaired loans	0	496
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	772	783
Impaired loans without a specific allowance	1,479	1,481
Impaired loans	$ 2,251	$ 2,264