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Capital Requirements - Comparison of Capital of Company & Bank with Minimum Regulatory Guidelines (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount Total Capital (to Risk Weighted Assets) $ 61,565 $ 59,876
Actual Ratio Total Capital (to Risk Weighted Assets) 16.57% 15.34%
Minimum Capital Requirement Amount Total Capital (to Risk Weighted Assets) 29,732 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) 56,830 54,897
Actual Ratio Tier 1 Capital (to Risk Weighted Assets) 15.29% 14.07%
Minimum Capital Requirement Amount Tier 1 Capital (to Risk Weighted Assets) 14,866 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) 56,830 54,897
Actual Ratio Tier 1 Capital (to Average Assets) 10.61% 10.47%
Minimum Capital Requirement Amount Tier 1 Capital (to Average Assets) 21,431 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) 55,397 52,980
Actual Ratio Total Capital (to Risk Weighted Assets) 14.92% 13.59%
Minimum Capital Requirement Amount Total Capital (to Risk Weighted Assets) 29,695 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) 37,118 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) 50,668 48,004
Actual Ratio Tier 1 Capital (to Risk Weighted Assets) 13.65% 12.31%
Minimum Capital Requirement Amount Tier 1 Capital (to Risk Weighted Assets) 14,847 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) 22,271 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) 50,668 48,004
Actual Ratio Tier 1 Capital (to Average Assets) 9.46% 9.15%
Minimum Capital Requirement Amount Tier 1 Capital (to Average Assets) 21,415 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) $ 26,769 $ 26,218
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio Tier 1 Capital (to Average Assets) 5.00% 5.00%