Loans - Allowances for Loan Losses and Ending Balances by Portfolio Segment and Impairment Method (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Ending allowance balances attributable to loans:
Individually evaluated for impairment	$ 184	$ 784
Collectively evaluated for impairment	4,197	4,301
Total ending allowance balance	4,381	5,085	4,580	4,082
Loans:
Loans individually evaluated for impairment	9,213	10,640
Loans collectively evaluated for impairment	401,338	368,242
Total ending loans balance	410,551	378,882
Commercial [Member]
Ending allowance balances attributable to loans:
Individually evaluated for impairment		241
Collectively evaluated for impairment	1,289	978
Total ending allowance balance	1,289	1,219	933	1,024
Loans:
Loans individually evaluated for impairment	5,922	5,576
Loans collectively evaluated for impairment	117,891	111,902
Total ending loans balance	123,813	117,478
Commercial Real Estate [Member]
Ending allowance balances attributable to loans:
Individually evaluated for impairment	109	331
Collectively evaluated for impairment	1,415	1,541
Total ending allowance balance	1,524	1,872	1,902	1,673
Loans:
Loans individually evaluated for impairment	1,679	3,220
Loans collectively evaluated for impairment	138,016	126,608
Total ending loans balance	139,695	129,828
Residential Real Estate [Member]
Ending allowance balances attributable to loans:
Individually evaluated for impairment	75	212
Collectively evaluated for impairment	964	993
Total ending allowance balance	1,039	1,205	1,096	894
Loans:
Loans individually evaluated for impairment	1,612	1,844
Loans collectively evaluated for impairment	120,072	109,601
Total ending loans balance	121,684	111,445
Construction & Land Development [Member]
Ending allowance balances attributable to loans:
Collectively evaluated for impairment	142	178
Total ending allowance balance	142	178	253	180
Loans:
Loans collectively evaluated for impairment	17,446	13,444
Total ending loans balance	17,446	13,444
Consumer [Member]
Ending allowance balances attributable to loans:
Collectively evaluated for impairment	60	91
Total ending allowance balance	60	91	76	78
Loans:
Loans collectively evaluated for impairment	7,913	6,687
Total ending loans balance	7,913	6,687
Unallocated [Member]
Ending allowance balances attributable to loans:
Collectively evaluated for impairment	327	520
Total ending allowance balance	$ 327	$ 520	$ 320	$ 233

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

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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 of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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