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	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	$ 13,371	$ 12,876
Allowance	4,272	4,924
Impaired loans without a specific allowance	8,675	9,334
Impaired loans	22,046	22,210
Unpaid principal balance in total impaired loans	32,326	35,121
Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	10,623	10,010
Impaired loans without a specific allowance	3,693	4,844
Impaired loans	14,316	14,854
Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	269	328
Impaired loans without a specific allowance	2,018	1,614
Impaired loans	2,287	1,942
Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	2,479	2,538
Impaired loans without a specific allowance	2,964	2,876
Impaired loans	5,443	5,414
Commercial
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	5,634	6,220
Allowance	2,556	3,594
Impaired loans without a specific allowance	1,184	1,366
Impaired loans	6,818	7,586
Unpaid principal balance in total impaired loans	9,302	11,056
Commercial | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	3,559	4,126
Impaired loans without a specific allowance	115	220
Impaired loans	3,674	4,346
Commercial | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	269	328
Impaired loans without a specific allowance	156	172
Impaired loans	425	500
Commercial | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	1,806	1,766
Impaired loans without a specific allowance	913	974
Impaired loans	2,719	2,740
All Other
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Allowance	0	0
Impaired loans without a specific allowance	1,360	1,729
Impaired loans	1,360	1,729
Unpaid principal balance in total impaired loans	2,715	3,081
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	1,087	1,442
Impaired loans	1,087	1,442
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	273	287
Impaired loans	273	287
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	829	0
Allowance	132	0
Impaired loans without a specific allowance	0	3,306
Impaired loans	829	3,306
Unpaid principal balance in total impaired loans	829	4,419
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	829	0
Impaired loans without a specific allowance	0	3,170
Impaired loans	829	3,170
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	0	136
Impaired loans	0	136
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	6,016	5,117
Allowance	1,558	1,207
Impaired loans without a specific allowance	3,213	238
Impaired loans	9,229	5,355
Unpaid principal balance in total impaired loans	13,794	9,909
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	5,468	5,117
Impaired loans without a specific allowance	2,438	238
Impaired loans	7,906	5,355
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	775	0
Impaired loans	775	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	548	0
Impaired loans without a specific allowance	0	0
Impaired loans	548	0
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	892	1,539
Allowance	26	123
Impaired loans without a specific allowance	2,918	2,695
Impaired loans	3,810	4,234
Unpaid principal balance in total impaired loans	5,686	6,656
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	767
Impaired loans without a specific allowance	1,140	1,216
Impaired loans	1,907	1,983
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	0
Impaired loans	0	0
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	125	772
Impaired loans without a specific allowance	1,778	1,479
Impaired loans	$ 1,903	$ 2,251