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Regulatory Matters - Bank's Actual Capital Amounts and Ratios (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Regulated Operations [Abstract]
Tier 1 risk-based capital, Actual amount	$ 139,182	$ 130,002
Total risk-based capital, Actual amount	146,100	135,322
Tier 1 leverage capital, Actual amount	139,182	130,002
Tier 1 risk-based capital, Actual percentage	20.84%	20.97%
Total risk-based capital, Actual percentage	21.88%	21.83%
Tier 1 leverage capital, Actual percentage	14.17%	13.67%
Tier 1 risk-based capital, Minimum For Capital Adequacy Purposes, amount	26,712	24,796
Total risk-based capital, Minimum For Capital Adequacy Purposes, amount	53,424	49,593
Tier 1 leverage capital, Minimum For Capital Adequacy Purposes, amount	14,730	38,050
Tier 1 risk-based capital, Minimum For Capital Adequacy Purposes, percentage	4.00%	4.00%
Total risk-based capital, Minimum For Capital Adequacy Purposes, percentage	8.00%	8.00%
Tier 1 leverage capital, Minimum For Capital Adequacy Purposes, percentage	4.00%	4.00%
Tier 1 risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, amount	40,068	37,195
Total risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, amount	66,780	61,991
Tier 1 leverage capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, amount	$ 49,100	$ 47,562
Tier 1 risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, percentage	6.00%	6.00%
Total risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, percentage	10.00%	10.00%
Tier 1 leverage capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, percentage	5.00%	5.00%

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The amount of total capital as defined in the regulations.

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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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