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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Schedule Of Regulatory Assets And Liabilities [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 246,162 $ 192,604
Total capital (to risk-weighted assets), Actual, Ratio 13.17% 13.08%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 149,529 $ 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 $ 186,911 $ 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 $ 229,994 $ 176,103
Tier 1 capital (to average assets), Actual, Ratio 12.30% 11.96%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 112,192 $ 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 $ 149,590 $ 88,346
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 8.00% 6.00%
Common equity tier 1 capital, Actual Amount $ 229,994  
Common equity tier 1 capital, Actual Ratio 12.30%  
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 84,144  
Common equity tier 1 capital, For capital adequacy purpose, Ratio 4.50%  
Common equity tier 1 capital, For well capitalized purpose, Amount $ 121,542  
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50%  
Tier 1 capital (to average assets), Actual, Amount $ 229,994 $ 176,103
Tier 1 capital (to average assets), Actual, Ratio 9.31% 8.80%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 98,816 $ 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 $ 123,520 $ 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 $ 261,858 $ 212,276
Total capital (to risk-weighted assets), Actual, Ratio 13.83% 14.48%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 151,472 $ 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 $ 245,690 $ 195,775
Tier 1 capital (to average assets), Actual, Ratio 12.98% 13.35%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 113,570 $ 58,659
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 6.00% 4.00%
Common equity tier 1 capital, Actual Amount $ 200,122  
Common equity tier 1 capital, Actual Ratio 10.57%  
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 85,199  
Common equity tier 1 capital, For capital adequacy purpose, Ratio 4.50%  
Tier 1 capital (to average assets), Actual, Amount $ 245,690 $ 195,775
Tier 1 capital (to average assets), Actual, Ratio 9.98% 9.76%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 98,473 $ 80,236
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 4.00% 4.00%