Loans Receivable, Net - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Impairment Method (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 206	$ 289
Collectively evaluated for impairment	4,330	4,537
Total ending allowance balance	4,536	4,826
Loans individually evaluated for impairment	13,249	9,937
Loans collectively evaluated for impairment	650,488	632,434
Total ending loans balance	663,737	642,371
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	141	233
Collectively evaluated for impairment	534	614
Total ending allowance balance	675	847
Loans individually evaluated for impairment	3,593	1,416
Loans collectively evaluated for impairment	88,873	87,522
Total ending loans balance	92,466	88,938
Land Development/Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment	969	1,384
Total ending allowance balance	969	1,384
Loans individually evaluated for impairment		515
Loans collectively evaluated for impairment	50,875	44,604
Total ending loans balance	50,875	45,119
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment		2
Collectively evaluated for impairment	1,616	1,468
Total ending allowance balance	1,616	1,470
Loans individually evaluated for impairment	9,174	7,532
Loans collectively evaluated for impairment	293,324	291,716
Total ending loans balance	302,498	299,248
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	13
Collectively evaluated for impairment	1,151	941
Total ending allowance balance	1,164	941
Loans individually evaluated for impairment	274	257
Loans collectively evaluated for impairment	209,182	200,189
Total ending loans balance	209,456	200,446
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	52	54
Collectively evaluated for impairment	60	130
Total ending allowance balance	112	184
Loans individually evaluated for impairment	208	217
Loans collectively evaluated for impairment	8,234	8,403
Total ending loans balance	$ 8,442	$ 8,620

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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