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Capital Requirements - Comparison of Capital of Company & Bank with Minimum Regulatory Guidelines (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount Total Capital (to Risk Weighted Assets) $ 60,623 $ 59,876
Actual Ratio Total Capital (to Risk Weighted Assets) 15.94% 15.34%
Minimum Capital Requirement Amount Total Capital (to Risk Weighted Assets) 30,433 31,220
Minimum Capital Requirement Ratio Total Capital (to Risk Weighted Assets) 8.00% 8.00%
Actual Amount Tier 1 Capital (to Risk Weighted Assets) 55,773 54,897
Actual Ratio Tier 1 Capital (to Risk Weighted Assets) 14.66% 14.07%
Minimum Capital Requirement Amount Tier 1 Capital (to Risk Weighted Assets) 15,216 15,610
Minimum Capital Requirement Ratio Tier 1 Capital (to Risk Weighted Assets) 4.00% 4.00%
Actual Amount Tier 1 Capital (to Average Assets) 55,773 54,897
Actual Ratio Tier 1 Capital (to Average Assets) 10.33% 10.47%
Minimum Capital Requirement Amount Tier 1 Capital (to Average Assets) 21,598 20,971
Minimum Capital Requirement Ratio Tier 1 Capital (to Average Assets) 4.00% 4.00%
First Bank [Member]
    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount Total Capital (to Risk Weighted Assets) 54,198 52,980
Actual Ratio Total Capital (to Risk Weighted Assets) 14.26% 13.59%
Minimum Capital Requirement Amount Total Capital (to Risk Weighted Assets) 30,399 31,197
Minimum Capital Requirement Ratio Total Capital (to Risk Weighted Assets) 8.00% 8.00%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Total Capital (to Risk Weighted Assets) 37,999 38,996
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Total Capital (to Risk Weighted Assets) 10.00% 10.00%
Actual Amount Tier 1 Capital (to Risk Weighted Assets) 49,353 48,004
Actual Ratio Tier 1 Capital (to Risk Weighted Assets) 12.99% 12.31%
Minimum Capital Requirement Amount Tier 1 Capital (to Risk Weighted Assets) 15,199 15,599
Minimum Capital Requirement Ratio Tier 1 Capital (to Risk Weighted Assets) 4.00% 4.00%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Tier 1 Capital (to Risk Weighted Assets) 22,799 23,398
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Risk Weighted Assets) 6.00% 6.00%
Actual Amount Tier 1 Capital (to Average Assets) 49,353 48,004
Actual Ratio Tier 1 Capital (to Average Assets) 9.13% 9.15%
Minimum Capital Requirement Amount Tier 1 Capital (to Average Assets) 21,616 20,974
Minimum Capital Requirement Ratio Tier 1 Capital (to Average Assets) 4.00% 4.00%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Tier 1 Capital (to Average Assets) $ 27,020 $ 26,218
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Average Assets) 5.00% 5.00%