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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($) $ in Thousands | Sep. 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 | $ 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%

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