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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Impaired Loans by Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	$ 881	$ 643
Impaired Loans with No Specific Allowance	10,145	7,330
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	881	643
Impaired Loans with No Specific Allowance	13,737	10,559
Related Allowance	51	43
Commercial real estate | Owner-occupied
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	1,237	1,070
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	2,479	2,236
Related Allowance	0	0
Commercial real estate | Non-owner occupied
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	4,065	736
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	4,856	1,323
Related Allowance	0	0
Commercial real estate | Multi-family
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	165	199
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	352	368
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	381	452
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	669	706
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
Acquisition and development | Commercial and land development
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance		0
Impaired Loans with No Specific Allowance		1
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance		0
Impaired Loans with No Specific Allowance		16
Related Allowance		0
Commercial and industrial
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	350	594
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	495	715
Related Allowance	0	0
Residential mortgage | First lien
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	872	643
Impaired Loans with No Specific Allowance	2,964	3,650
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	872	643
Impaired Loans with No Specific Allowance	3,706	4,399
Related Allowance	42	43
Residential mortgage | Home equity – term
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	22	93
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	27	103
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	467	529
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	0	0
Impaired Loans with No Specific Allowance	628	659
Related Allowance	0	0
Installment and other loans
Recorded Investment (Book Balance)
Impaired Loans with a Specific Allowance	9	0
Impaired Loans with No Specific Allowance	2	6
Unpaid Principal Balance (Legal Balance)
Impaired Loans with a Specific Allowance	9	0
Impaired Loans with No Specific Allowance	33	34
Related Allowance	$ 9	$ 0

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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