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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Regulatory Assets And Liabilities [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 316,576 $ 264,452
Total capital (to risk-weighted assets), Actual, Ratio 13.87% 13.99%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 182,596 $ 151,223
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio 8.00% 8.00%
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 196,976  
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 8.63%  
Tier 1 capital (to average assets), Actual, Amount $ 301,739 $ 249,918
Tier 1 capital (to average assets), Actual, Ratio 13.22% 13.22%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 136,947 $ 113,427
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 6.00% 6.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 151,326  
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 6.63%  
Common equity tier 1 capital, Actual Amount $ 263,313 $ 204,350
Common equity tier 1 capital, Actual Ratio 11.50% 10.81%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 103,036 $ 85,067
Common equity tier 1 capital, For capital adequacy purpose, Ratio 4.50% 4.50%
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 117,460  
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 5.13%  
Tier 1 capital (to average assets), Actual, Amount $ 301,739 $ 249,918
Tier 1 capital (to average assets), Actual, Ratio 10.44% 9.82%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 115,609 $ 101,800
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 4.00% 4.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 115,609  
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 4.00%  
Bank [Member]    
Schedule Of Regulatory Assets And Liabilities [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 319,013 $ 237,348
Total capital (to risk-weighted assets), Actual, Ratio 13.98% 12.57%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 182,541 $ 151,057
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio 8.00% 8.00%
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 196,916  
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 8.63%  
Total capital (to risk-weighted assets), For well capitalized purpose, Amount $ 228,176 $ 188,821
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio 10.00% 10.00%
Tier 1 capital (to average assets), Actual, Amount $ 304,176 $ 222,814
Tier 1 capital (to average assets), Actual, Ratio 13.33% 11.80%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 136,905 $ 113,295
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 6.00% 6.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 151,280  
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 6.63%  
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 182,540 $ 151,060
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 8.00% 8.00%
Common equity tier 1 capital, Actual Amount $ 304,176 $ 222,814
Common equity tier 1 capital, Actual Ratio 13.33% 11.80%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 102,679 $ 84,971
Common equity tier 1 capital, For capital adequacy purpose, Ratio 4.50% 4.50%
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 117,054  
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 5.13%  
Common equity tier 1 capital, For well capitalized purpose, Amount $ 148,314 $ 122,737
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50% 6.50%
Tier 1 capital (to average assets), Actual, Amount $ 304,176 $ 222,814
Tier 1 capital (to average assets), Actual, Ratio 9.93% 8.77%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 122,521 $ 101,626
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 4.00% 4.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount $ 122,521  
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 4.00%  
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 153,151 $ 127,032
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 5.00% 5.00%