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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule Of Regulatory Assets And Liabilities [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 267,414 $ 264,452
Total capital (to risk-weighted assets), Actual, Ratio 12.56% 13.99%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 183,703 $ 151,223
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio 8.63% 8.00%
Tier 1 capital (to average assets), Actual, Amount $ 253,188 $ 249,918
Tier 1 capital (to average assets), Actual, Ratio 11.89% 13.22%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 141,130 $ 113,427
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 6.63% 6.00%
Common equity tier 1 capital, Actual Amount $ 220,120 $ 249,918
Common equity tier 1 capital, Actual Ratio 10.34% 13.22%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 109,200 $ 113,427
Common equity tier 1 capital, For capital adequacy purpose, Ratio 5.13% 6.00%
Tier 1 capital (to average assets), Actual, Amount $ 253,188 $ 249,918
Tier 1 capital (to average assets), Actual, Ratio 9.55% 9.82%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 106,069 $ 101,800
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 4.00% 4.00%
Bank [Member]    
Schedule Of Regulatory Assets And Liabilities [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 257,203 $ 237,348
Total capital (to risk-weighted assets), Actual, Ratio 12.45% 12.57%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 178,286 $ 151,057
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio 8.63% 8.00%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount $ 206,589 $ 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 $ 242,977 $ 222,814
Tier 1 capital (to average assets), Actual, Ratio 11.77% 11.80%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 136,868 $ 113,295
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio 6.63% 6.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 165,150 $ 151,060
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 8.00% 8.00%
Common equity tier 1 capital, Actual Amount $ 242,977 $ 222,814
Common equity tier 1 capital, Actual Ratio 11.77% 11.80%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 105,902 $ 113,295
Common equity tier 1 capital, For capital adequacy purpose, Ratio 5.13% 6.00%
Common equity tier 1 capital, For well capitalized purpose, Amount $ 134,184 $ 151,060
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50% 8.00%
Tier 1 capital (to average assets), Actual, Amount $ 242,977 $ 222,814
Tier 1 capital (to average assets), Actual, Ratio 9.18% 8.77%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 105,872 $ 101,626
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 $ 132,340 $ 127,032
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 5.00% 5.00%