Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Regulatory Assets And Liabilities [Line Items]
Total capital (to risk-weighted assets), Actual, Amount	$ 195,409us-gaap_Capital	$ 192,604us-gaap_Capital
Total capital (to risk-weighted assets), Actual, Ratio	12.35%us-gaap_CapitalToRiskWeightedAssets	13.08%us-gaap_CapitalToRiskWeightedAssets
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount	126,581	117,801
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	158,226	147,251
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio	10.00%	10.00%
Tier 1 capital (to average assets), Actual, Amount	178,775us-gaap_TierOneRiskBasedCapital	176,103us-gaap_TierOneRiskBasedCapital
Tier 1 capital (to average assets), Actual, Ratio	11.30%	11.96%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	94,925	58,897
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	6.00%	4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount	126,566	88,346
Tier 1 capital (to average assets), For well capitalized purposes, Ratio	8.00%	6.00%
Common equity tier 1 capital, Actual Amount	178,775
Common equity tier 1 capital, Actual Ratio	11.30%
Common equity tier 1 capital,For capital adequacy purposes, Amount	71,194
Common equity tier 1 capital, For capital adequacy purpose, Ratio	4.50%
Common equity tier 1 capital, For well capitalized purpose, Amount	102,835
Common equity tier 1 capital, For well capitalized purposes, Ratio	6.50%
Tier 1 capital (to average assets), Actual, Amount	178,775us-gaap_TierOneLeverageCapital	176,103us-gaap_TierOneLeverageCapital
Tier 1 capital (to average assets), Actual, Ratio	8.77%	8.80%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	81,539	80,047
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	101,924	100,059
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	218,613	212,276
Total capital (to risk-weighted assets), Actual, Ratio	13.74%	14.48%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount	127,286	117,280
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio	8.00%	8.00%
Tier 1 capital (to average assets), Actual, Amount	201,979	195,775
Tier 1 capital (to average assets), Actual, Ratio	12.69%	13.35%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	95,498	58,659
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	6.00%	4.00%
Common equity tier 1 capital, Actual Amount	156,411
Common equity tier 1 capital, Actual Ratio	9.83%
Common equity tier 1 capital,For capital adequacy purposes, Amount	71,602
Common equity tier 1 capital, For capital adequacy purpose, Ratio	4.50%
Tier 1 capital (to average assets), Actual, Amount	201,979	195,775
Tier 1 capital (to average assets), Actual, Ratio	9.97%	9.76%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	$ 81,035	$ 80,236
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio	4.00%	4.00%

Common Equity Tier One Risk Based Capital

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Common Equity Tier One Risk Based Capital Required For Capital Adequacy

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Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets

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Common Equity Tier One Risk Based Capital Required To Be Well Capitalized

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Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets

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Common Equity Tier One Risk Based Capital To Risk Weighted Assets

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The amount of total capital as defined in the regulations.

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The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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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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Total Capital divided by risk weighted assets as defined in the regulations.

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

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The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

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Tier 1 Risk Based Capital as defined in the regulations.

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The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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

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