CREDIT QUALITY ASSESSMENT (Credit Quality of Loan Portfolio by Segment) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment [Line Items]
Non-accrual loans	$ 26,336	$ 29,211
Loans 90 days past due	225	232
Restructured loans	2,788	2,489
Total non-performing loans	29,349	31,932
Other real estate owned	2,253	1,911
Total non-performing assets	31,602	33,843
Commercial
Financing Receivable Recorded Investment [Line Items]
Non-accrual loans	6,703	5,833
Loans 90 days past due	0	0
Restructured loans	1,402	1,185
Total non-performing loans	8,105	7,018
Other real estate owned	39	39
Total non-performing assets	8,144	7,057
Consumer
Financing Receivable Recorded Investment [Line Items]
Non-accrual loans	2,967	2,859
Loans 90 days past due	0	0
Restructured loans	0	0
Total non-performing loans	2,967	2,859
Other real estate owned	0	0
Total non-performing assets	2,967	2,859
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
Financing Receivable Recorded Investment [Line Items]
Non-accrual loans	136	137
Loans 90 days past due	0	0
Restructured loans	0	0
Total non-performing loans	136	137
Other real estate owned	365	365
Total non-performing assets	501	502
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
Financing Receivable Recorded Investment [Line Items]
Non-accrual loans	5,575	8,107
Loans 90 days past due	0	0
Restructured loans	0	0
Total non-performing loans	5,575	8,107
Other real estate owned	0	395
Total non-performing assets	5,575	8,502
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
Financing Receivable Recorded Investment [Line Items]
Non-accrual loans	3,582	4,823
Loans 90 days past due	0	0
Restructured loans	496	744
Total non-performing loans	4,078	5,567
Other real estate owned	400	637
Total non-performing assets	4,478	6,204
Residential Real Estate Portfolio Segment | Residential Mortgage
Financing Receivable Recorded Investment [Line Items]
Non-accrual loans	7,196	7,257
Loans 90 days past due	225	232
Restructured loans	890	560
Total non-performing loans	8,311	8,049
Other real estate owned	1,449	475
Total non-performing assets	9,760	8,524
Residential Real Estate Portfolio Segment | Residential Construction
Financing Receivable Recorded Investment [Line Items]
Non-accrual loans	177	195
Loans 90 days past due	0	0
Restructured loans	0	0
Total non-performing loans	177	195
Other real estate owned	0	0
Total non-performing assets	$ 177	$ 195