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Regulatory and Operational Matters - Company's and Bank's Actual Capital Amounts and Ratios (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 Capital (to Average Assets), Actual Ratio 9.00%  
Company [Member]
    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk Weighted Assets), Actual Amount $ 57,483 $ 63,253
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 52,332 58,186
Tier 1 Capital (to Average Assets), Actual Amount 52,332 58,186
Total Capital (to Risk Weighted Assets), Actual Ratio 13.96% 15.64%
Tier 1 Capital (to Risk Weighted Assets), Actual Ratio 12.71% 14.39%
Tier 1 Capital (to Average Assets), Actual Ratio 9.13% 9.33%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 32,942 32,354
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 16,470 16,174
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 22,927 24,946
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio 8.00% 8.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio 4.00% 4.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio 4.00% 4.00%
Bank [Member]
    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital (to Risk Weighted Assets), Actual Amount 56,937 61,908
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 51,792 56,840
Tier 1 Capital (to Average Assets), Actual Amount 51,792 56,840
Total Capital (to Risk Weighted Assets), Actual Ratio 13.84% 15.31%
Tier 1 Capital (to Risk Weighted Assets), Actual Ratio 12.59% 14.05%
Tier 1 Capital (to Average Assets), Actual Ratio 9.05% 9.11%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 32,912 32,349
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 16,455 16,182
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 22,891 24,957
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio 8.00% 8.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio 4.00% 4.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio 4.00% 4.00%
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 41,139 40,468
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 24,682 24,280
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 28,614 $ 31,191
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00% 10.00%
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 6.00% 6.00%
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.00% 5.00%