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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Impaired Loans by Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	$ 743	$ 881
Impaired Loans with No Specific Allowance	5,554	10,145
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	743	881
Impaired Loans with No Specific Allowance	7,832	13,737
Related Allowance	38	51
Commercial Real Estate | Owner-occupied
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	1,880	1,237
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	2,576	2,479
Related Allowance	0	0
Commercial Real Estate | Non-owner occupied
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance		0
Impaired Loans with No Specific Allowance		4,065
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance		0
Impaired Loans with No Specific Allowance		4,856
Related Allowance		0
Commercial Real Estate | Multi-family
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	131	165
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	336	352
Related Allowance	0	0
Commercial Real Estate | Non-owner occupied residential
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	309	381
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	632	669
Related Allowance	0	0
Acquisition and development | 1-4 family residential construction
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance		0
Impaired Loans with No Specific Allowance		492
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance		0
Impaired Loans with No Specific Allowance		492
Related Allowance		0
Commercial and industrial
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	286	350
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	457	495
Related Allowance	0	0
Residential mortgage | First lien
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	743	872
Impaired Loans with No Specific Allowance	2,134	2,964
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	743	872
Impaired Loans with No Specific Allowance	2,727	3,706
Related Allowance	38	42
Residential mortgage | Home equity – term
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	16	22
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	23	27
Related Allowance	0	0
Residential mortgage | Home equity lines of credit
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	798	467
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	1,081	628
Related Allowance	$ 0	0
Installment and other loans
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance		9
Impaired Loans with No Specific Allowance		2
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance		9
Impaired Loans with No Specific Allowance		33
Related Allowance		$ 9

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