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	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	$ 11,829	$ 11,693
Impaired loans without a specific allowance	7,068	9,116
Impaired loans	18,897	20,809
Impaired Financing Receivable, Related Allowance	4,503	4,014
Unpaid principal balance in total impaired loans	30,899	32,689
Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	8,650	9,673
Impaired loans without a specific allowance	2,129	2,127
Impaired loans	10,779	11,800
Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	342	1,129
Impaired loans without a specific allowance	1,321	1,659
Impaired loans	1,663	2,788
Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	2,837	891
Impaired loans without a specific allowance	3,618	5,330
Impaired loans	6,455	6,221
Commercial
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	5,894	5,753
Impaired loans without a specific allowance	1,774	2,352
Impaired loans	7,668	8,105
Impaired Financing Receivable, Related Allowance	3,123	3,220
Unpaid principal balance in total impaired loans	10,755	11,263
Commercial | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	3,493	4,516
Impaired loans without a specific allowance	307	391
Impaired loans	3,800	4,907
Commercial | Restructuring | Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	342	1,129
Impaired loans without a specific allowance	443	273
Impaired loans	785	1,402
Commercial | Restructuring | Non Accrual Loans
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	2,059	108
Impaired loans without a specific allowance	1,024	1,688
Impaired loans	3,083	1,796
All Other
Financing Receivable Impaired [Line Items]
Impaired loans with a specific allowance	0	0
Impaired loans without a specific allowance	1,775	2,915
Impaired loans	1,775	2,915
Impaired Financing Receivable, Related Allowance	0	0
Unpaid principal balance in total impaired loans	2,646	3,681
All Other | Non Accrual Loans
Financing Receivable Impaired [Line Items]
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	878	890
Impaired loans	878	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	897	2,025
Impaired loans	897	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	136	136
Impaired loans	136	136
Impaired Financing Receivable, Related Allowance	0	0
Unpaid principal balance in total impaired loans	1,248	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	0	0
Impaired loans	0	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	5,157	5,157
Impaired loans without a specific allowance	721	418
Impaired loans	5,878	5,575
Impaired Financing Receivable, Related Allowance	1,255	663
Unpaid principal balance in total impaired loans	10,476	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	5,157	5,157
Impaired loans without a specific allowance	721	418
Impaired loans	5,878	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	778	783
Impaired loans without a specific allowance	2,662	3,295
Impaired loans	3,440	4,078
Impaired Financing Receivable, Related Allowance	125	131
Unpaid principal balance in total impaired loans	5,774	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	0	0
Impaired loans without a specific allowance	1,101	1,318
Impaired loans	1,101	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	778	783
Impaired loans without a specific allowance	1,561	1,481
Impaired loans	$ 2,339	$ 2,264