CREDIT QUALITY ASSESSMENT (Additional Information) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Troubled Debt Restructurings Restructured Accruing	$ 2,100	$ 600
Other real estate owned	2,253	1,911
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other real estate owned	1,500
Restructured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Troubled Debt Restructurings Specific Allowance	200
Financing Receivable Troubled Debt Restructurings Restructured Accruing	2,800	2,500
Financing Receivable Troubled Debt Restructurings Restructured Non Accruing	6,200	6,700
Financing Receivable Troubled Debt Restructurings Balance	9,000	9,200
Additional Financing Receivable Troubled Debt Restructurings Restructured	$ 0	$ 100