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Actual Capital Amounts and Ratios (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), actual amount $ 49,347 $ 46,018
Tier 1 capital (to risk-weighted assets), actual amount 45,383 43,494
Tier I capital (to adjusted total assets), actual amount 45,383 43,494
Tangible capital (to adjusted total assets), actual amount 45,383 43,494
Total capital (to risk-weighted assets), actual ratio 15.60% 17.05%
Tier 1 capital (to risk-weighted assets), actual ratio 14.35% 16.11%
Tier I capital (to adjusted total assets), actual ratio 10.00% 10.06%
Tangible capital (to adjusted total assets), actual ratio 10.00% 10.06%
Total capital (to risk-weighted assets), minimum amount for capital adequacy purposes 25,307 21,597
Tier 1 capital (to risk-weighted assets), minimum amount for capital adequacy purposes      
Tier I capital (to adjusted total assets), minimum amount for capital adequacy purposes 18,149 17,302
Tangible capital (to adjusted total assets), minimum amount for capital adequacy purposes 6,806 6,488
Total capital (to risk-weighted assets), minimum amount for capital adequacy purposes 8.00% 8.00%
Tier 1 capital (to risk-weighted assets), minimum amount for capital adequacy purposes      
Tier I capital (to adjusted total assets), minimum amount for capital adequacy purposes 4.00% 4.00%
Tangible capital (to adjusted total assets), minimum amount for capital adequacy purposes 1.50% 1.50%
Total capital (to risk-weighted assets), minimum amount to be well capitalized under prompt corrective action provisions 31,634 26,996
Tier 1 capital (to risk-weighted assets), minimum amount to be well capitalized under prompt corrective action provisions 18,980 16,197
Tier I capital (to adjusted total assets), minimum amount to be well capitalized under prompt corrective action provisions 22,686 21,627
Tangible capital (to adjusted total assets), minimum amount to be well capitalized under prompt corrective action provisions      
Total capital (to risk-weighted assets), minimum ratio to be well capitalized under prompt corrective action provisions 10.00% 10.00%
Tier 1 capital (to risk-weighted assets), minimum ratio to be well capitalized under prompt corrective action provisions 6.00% 6.00%
Tier I capital (to adjusted total assets), minimum ratio to be well capitalized under prompt corrective action provisions 5.00% 5.00%
Tangible capital (to adjusted total assets), minimum ratio to be well capitalized under prompt corrective action provisions