Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Regulatory Assets And Liabilities [Line Items]
Total capital (to risk-weighted assets), Actual, Amount	$ 192,604us-gaap_Capital	$ 173,634us-gaap_Capital
Total capital (to risk-weighted assets), Actual, Ratio	13.08%us-gaap_CapitalToRiskWeightedAssets	14.67%us-gaap_CapitalToRiskWeightedAssets
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount	117,801	94,688
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio	8.00%	8.00%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount	147,251	118,360
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio	10.00%	10.00%
Tier 1 capital (to average assets), Actual, Amount	176,103us-gaap_TierOneRiskBasedCapital	158,827us-gaap_TierOneRiskBasedCapital
Tier 1 capital (to average assets), Actual, Ratio	11.96%	13.42%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	58,897	47,340
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	4.00%	4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount	88,346	71,011
Tier 1 capital (to average assets), For well capitalized purposes, Ratio	6.00%	6.00%
Tier 1 capital (to average assets), Actual, Amount	176,103us-gaap_TierOneLeverageCapital	158,827us-gaap_TierOneLeverageCapital
Tier 1 capital (to average assets), Actual, Ratio	8.80%	9.18%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	80,047	69,206
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	4.00%	4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount	100,059	86,507
Tier 1 capital (to average assets), For well capitalized purposes, Ratio	5.00%	5.00%
Consolidated [Member]
Schedule Of Regulatory Assets And Liabilities [Line Items]
Total capital (to risk-weighted assets), Actual, Amount	212,276	192,904
Total capital (to risk-weighted assets), Actual, Ratio	14.48%	16.33%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount	117,280	94,503
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio	8.00%	8.00%
Tier 1 capital (to average assets), Actual, Amount	195,775	178,115
Tier 1 capital (to average assets), Actual, Ratio	13.35%	15.08%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	58,659	47,245
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	4.00%	4.00%
Tier 1 capital (to average assets), Actual, Amount	195,775	178,115
Tier 1 capital (to average assets), Actual, Ratio	9.76%	10.28%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	$ 80,236	$ 69,305
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	4.00%	4.00%

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The amount of total capital as defined in the regulations.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Risk Based Capital as defined in the regulations.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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