Capital Standards (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
To be well capitalized ratio [Abstract]
Total risk-based capital (to risk weighted assets) (in hundredths)	10.00%	10.00%	10.00%
Tier 1 capital (to risk-weighted assets) (in hundredths)	6.00%	6.00%	6.00%
Tier 1 capital (to average fourth quarter assets) (in hundredths)	5.00%	5.00%	5.00%
Minimum adequacy ratio [Abstract]
Total risk-based capital (to risk weighted assets) (in hundredths)	8.00%	8.00%	8.00%
Tier 1 capital (to risk-weighted assets) (in hundredths)	4.00%	4.00%	4.00%
Tier 1 capital (to average fourth quarter assets) (in hundredths)	4.00%	4.00%	4.00%
Company [Member]
Actual amount [Abstract]
Total risk-based capital (to risk weighted assets)	76,924	75,629	74,449
Tier 1 capital (to risk-weighted assets)	76,081	74,938	73,176
Tier 1 capital (to average fourth quarter assets)	76,081	74,938	73,176
Actual ratio [Abstract]
Total risk-based capital ( to risk weighted assets) (in hundredths)	35.40%	35.00%	33.60%
Tier 1 capital (to risk-weighted assets) (in hundredths)	35.00%	34.60%	33.00%
Tier 1 capital (to average fourth quarter assets) (in hundredths)	17.10%	17.90%	17.50%
Bank [Member]
Actual amount [Abstract]
Total risk-based capital (to risk weighted assets)	73,022	71,740	70,181
Tier 1 capital (to risk-weighted assets)	72,242	71,068	69,198
Tier 1 capital (to average fourth quarter assets)	72,242	71,068	69,198
Actual ratio [Abstract]
Total risk-based capital ( to risk weighted assets) (in hundredths)	34.00%	33.60%	32.10%
Tier 1 capital (to risk-weighted assets) (in hundredths)	33.70%	33.30%	31.70%
Tier 1 capital (to average fourth quarter assets) (in hundredths)	16.40%	17.10%	16.90%

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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 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 for capital adequacy purposes 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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