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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 403,480 $ 384,800
Total capital (to risk-weighted assets), Actual, Ratio 13.07% 12.91%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 246,952 $ 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 $ 285,539 $ 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 $ 386,409 $ 368,355
Tier 1 capital (to average assets), Actual, Ratio 12.52% 12.35%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 185,214 $ 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 $ 223,800 $ 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 $ 347,946 $ 329,892
Common equity tier 1 capital, Actual Ratio 11.27% 11.06%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 138,910 $ 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 $ 177,497 $ 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 $ 386,409 $ 368,355
Tier 1 capital (to average assets), Actual, Ratio 9.94% 9.92%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 155,556 $ 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 $ 155,556 $ 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 $ 392,814 $ 382,788
Total capital (to risk-weighted assets), Actual, Ratio 12.77% 12.85%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount $ 246,109 $ 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 $ 284,563 $ 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 $ 307,636 $ 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 $ 375,684 $ 366,343
Tier 1 capital (to average assets), Actual, Ratio 12.21% 12.29%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 184,581 $ 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 $ 223,035 $ 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 $ 246,108 $ 238,386
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 8.00% 8.00%
Common equity tier 1 capital, Actual Amount $ 375,684 $ 366,343
Common equity tier 1 capital, Actual Ratio 12.21% 12.29%
Common equity tier 1 capital,For capital adequacy purposes, Amount $ 138,436 $ 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 $ 176,890 $ 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 $ 199,963 $ 193,689
Common equity tier 1 capital, For well capitalized purposes, Ratio 6.50% 6.50%
Tier 1 capital (to average assets), Actual, Amount $ 375,684 $ 366,343
Tier 1 capital (to average assets), Actual, Ratio 9.65% 9.89%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount $ 155,805 $ 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 $ 155,805 $ 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 $ 194,756 $ 185,145
Tier 1 capital (to average assets), For well capitalized purposes, Ratio 5.00% 5.00%