Allowance for Loan Losses - Schedule of Loans and Reserve Balances by Loan Segment Both Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable Allowance For Credit Losses [Line Items]
Individually Evaluated, Reserve	$ 139	$ 181
Individually Evaluated, Loans	6,089	5,478
Collectively Evaluated, Reserve	2,568	2,703
Collectively Evaluated, Loans	335,740	314,654
Total Reserve	2,707	2,884	$ 3,738	$ 5,095
Total Loans	341,829	320,132
Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Individually Evaluated, Reserve	16	18
Individually Evaluated, Loans	1,993	1,019
Collectively Evaluated, Reserve	1,388	1,292
Collectively Evaluated, Loans	190,229	170,182
Total Reserve	1,404	1,310	1,716	2,665
Total Loans	192,222	171,201
Non-Commercial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Individually Evaluated, Reserve	123	163
Individually Evaluated, Loans	4,096	4,459
Collectively Evaluated, Reserve	1,180	1,411
Collectively Evaluated, Loans	145,511	144,472
Total Reserve	1,303	1,574	$ 2,022	$ 2,430
Total Loans	$ 149,607	$ 148,931

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Publisher FASB
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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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