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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule Of Regulatory Assets And Liabilities [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 192,896 $ 192,604
Total capital (to risk-weighted assets), Actual, Ratio 11.76% 13.08%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 131,222 $ 117,801
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio 8.00% 8.00%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount $ 164,027 $ 147,251
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio 10.00% 10.00%
Tier 1 capital (to average assets), Actual, Amount $ 176,475 $ 176,103
Tier 1 capital (to average assets), Actual, Ratio 10.76% 11.96%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 98,406 $ 58,897
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 6.00% 4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 131,208 $ 88,346
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 8.00% 6.00%
Common equity tier 1 capital, Actual Amount $ 176,475  
Common equity tier 1 capital, Actual Ratio 10.76%  
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 73,805  
Common equity tier 1 capital, For capital adequacy purpose, Ratio 4.50%  
Common equity tier 1 capital, For well capitalized purpose, Amount $ 106,607  
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50%  
Tier 1 capital (to average assets), Actual, Amount $ 176,475 $ 176,103
Tier 1 capital (to average assets), Actual, Ratio 8.24% 8.80%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 85,667 $ 80,047
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 4.00% 4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 107,084 $ 100,059
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 5.00% 5.00%
Consolidated [Member]    
Schedule Of Regulatory Assets And Liabilities [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 222,223 $ 212,276
Total capital (to risk-weighted assets), Actual, Ratio 13.53% 14.48%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 131,396 $ 117,280
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio 8.00% 8.00%
Tier 1 capital (to average assets), Actual, Amount $ 205,802 $ 195,775
Tier 1 capital (to average assets), Actual, Ratio 12.53% 13.35%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 98,548 $ 58,659
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 6.00% 4.00%
Common equity tier 1 capital, Actual Amount $ 160,234  
Common equity tier 1 capital, Actual Ratio 9.75%  
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 73,954  
Common equity tier 1 capital, For capital adequacy purpose, Ratio 4.50%  
Tier 1 capital (to average assets), Actual, Amount $ 205,802 $ 195,775
Tier 1 capital (to average assets), Actual, Ratio 9.61% 9.76%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 85,662 $ 80,236
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 4.00% 4.00%