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Shareholders' Equity - Summary of Actual Capital Amount and Well Capitalized Total Risk-Based, Tier I Risk-Based, and Tier I Leverage Ratios (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Tier 1 capital (to risk-weighted assets), Actual Regulatory Capital, Amount $ 71,887 $ 65,908
Tier 1 capital (to risk-weighted assets), Actual Regulatory Capital, Ratio 22.19% 21.52%
Tier 1 capital (to risk-weighted assets), Minimum Requirement 6.00% 4.00%
Tier 1 capital (to risk-weighted assets), To Be Well Capitalized 8.00% 6.00%
Total capital (to risk-weighted assets), Actual Regulatory Capital, Amount $ 75,668 $ 69,765
Total capital (to risk-weighted assets), Actual Regulatory Capital, Ratio 23.35% 22.78%
Total capital (to risk-weighted assets), Minimum Requirement 8.00% 8.00%
Total capital (to risk-weighted assets), To Be Well Capitalized 10.00% 10.00%
Tier 1 leverage (to average assets), Actual Regulatory Capital, Amount $ 71,887 $ 65,908
Tier 1 leverage (to average assets), Actual Regulatory Capital, Ratio 13.02% 11.85%
Tier 1 leverage (to average assets), Minimum Requirement 4.00% 4.00%
Tier 1 leverage (to average assets), To Be Well Capitalized 5.00% 5.00%
Common Equity [Member]    
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]    
Tier 1 capital (to risk-weighted assets), Actual Regulatory Capital, Amount $ 71,887  
Tier 1 capital (to risk-weighted assets), Actual Regulatory Capital, Ratio 22.19%  
Tier 1 capital (to risk-weighted assets), Minimum Requirement 4.50%  
Tier 1 capital (to risk-weighted assets), To Be Well Capitalized 6.50%