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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 417,728 $ 384,800
Total capital (to risk-weighted assets), Actual, Ratio 13.31% 12.91%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 251,097 $ 238,543
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 $ 290,331 $ 275,816
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 9.25% 9.25%
Tier 1 capital (to average assets), Actual, Amount $ 399,885 $ 368,355
Tier 1 capital (to average assets), Actual, Ratio 12.74% 12.35%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 188,323 $ 178,907
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 $ 227,557 $ 216,180
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 7.25% 7.25%
Common equity tier 1 capital, Actual Amount $ 361,422 $ 329,892
Common equity tier 1 capital, Actual Ratio 11.52% 11.06%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 141,242 $ 134,181
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 $ 180,476 $ 171,454
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 5.75% 5.75%
Tier 1 capital (to average assets), Actual, Amount $ 399,885 $ 368,355
Tier 1 capital (to average assets), Actual, Ratio 10.05% 9.92%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 159,098 $ 148,503
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 $ 159,098 $ 148,503
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 4.00% 4.00%
Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 397,610 $ 382,788
Total capital (to risk-weighted assets), Actual, Ratio 12.66% 12.85%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 251,262 $ 238,386
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 $ 290,522 $ 275,634
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 9.25% 9.25%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount $ 314,078 $ 297,982
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio 10.00% 10.00%
Tier 1 capital (to average assets), Actual, Amount $ 379,767 $ 366,343
Tier 1 capital (to average assets), Actual, Ratio 12.09% 12.29%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 188,447 $ 178,790
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 $ 227,706 $ 216,038
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 7.25% 7.25%
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 251,262 $ 238,386
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 8.00% 8.00%
Common equity tier 1 capital, Actual Amount $ 379,767 $ 366,343
Common equity tier 1 capital, Actual Ratio 12.09% 12.29%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 141,335 $ 134,092
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 $ 180,595 $ 171,340
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio 5.75% 5.75%
Common equity tier 1 capital, For well capitalized purpose, Amount $ 204,150 $ 193,689
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50% 6.50%
Tier 1 capital (to average assets), Actual, Amount $ 379,767 $ 366,343
Tier 1 capital (to average assets), Actual, Ratio 9.53% 9.89%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 159,405 $ 148,116
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 $ 159,405 $ 148,116
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio 4.00% 4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount $ 199,257 $ 185,145
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 5.00% 5.00%