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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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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%

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