Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Regulatory Assets And Liabilities [Line Items]
Total capital (to risk-weighted assets), Actual, Amount	$ 173,634	$ 161,557
Total capital (to risk-weighted assets), Actual, Ratio	14.67%	12.42%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount	94,688	104,062
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	118,360	130,078
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio	10.00%	10.00%
Tier 1 capital (to average assets), Actual, Amount	158,827	145,273
Tier 1 capital (to average assets), Actual, Ratio	13.42%	11.17%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	47,340	52,023
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	71,011	78,034
Tier 1 capital (to average assets), For well capitalized purposes, Ratio	6.00%	6.00%
Tier 1 capital (to average assets), Actual, Amount	158,827	145,273
Tier 1 capital (to average assets), Actual, Ratio	9.18%	8.22%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	69,206	70,692
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	86,507	88,366
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	192,904	178,638
Total capital (to risk-weighted assets), Actual, Ratio	16.33%	13.72%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount	94,503	104,162
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
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio
Tier 1 capital (to average assets), Actual, Amount	178,115	162,354
Tier 1 capital (to average assets), Actual, Ratio	15.08%	12.47%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	47,245	52,078
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
Tier 1 capital (to average assets), For well capitalized purposes, Ratio
Tier 1 capital (to average assets), Actual, Amount	178,115	162,354
Tier 1 capital (to average assets), Actual, Ratio	10.28%	9.17%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount	69,305	70,820
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
Tier 1 capital (to average assets), For well capitalized purposes, Ratio

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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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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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