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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital (to risk-weighted assets), Actual, Amount | $ 519,613 | $ 427,616
Total capital (to risk-weighted assets), Actual, Ratio | 13.23% | 13.39%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 314,113 | $ 255,419
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 | $ 412,273 | $ 315,283
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 10.50% | 9.875%
Tier 1 capital (to average assets), Actual, Amount | $ 501,272 | $ 409,760
Tier 1 capital (to average assets), Actual, Ratio | 12.77% | 12.83%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 235,586 | $ 191,565
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 | $ 333,747 | $ 251,429
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 8.50% | 7.875%
Common equity tier 1 capital, Actual Amount | $ 443,779 | $ 371,297
Common equity tier 1 capital, Actual Ratio | 11.30% | 11.63%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 176,689 | $ 143,673
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 | $ 274,849 | $ 203,537
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 7.00% | 6.375%
Tier 1 capital (to average assets), Actual, Amount | $ 501,272 | $ 409,760
Tier 1 capital (to average assets), Actual, Ratio | 10.33% | 10.12%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 194,081 | $ 162,033
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 | $ 194,081 | $ 162,033
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 | $ 480,366 | $ 396,755
Total capital (to risk-weighted assets), Actual, Ratio | 12.23% | 12.43%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 314,242 | $ 255,419
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 | $ 412,443 | $ 315,283
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 10.50% | 9.875%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount | $ 392,802 | $ 319,274
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio | 10.00% | 10.00%
Tier 1 capital (to average assets), Actual, Amount | $ 462,025 | $ 378,899
Tier 1 capital (to average assets), Actual, Ratio | 11.76% | 11.87%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 235,681 | $ 191,565
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 | $ 333,881 | $ 251,429
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 8.50% | 7.875%
Tier 1 capital (to average assets), For well capitalized purpose, Amount | $ 314,241 | $ 255,420
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 8.00% | 8.00%
Common equity tier 1 capital, Actual Amount | $ 462,025 | $ 378,899
Common equity tier 1 capital, Actual Ratio | 11.76% | 11.87%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 176,761 | $ 143,674
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 | $ 274,961 | $ 203,537
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 7.00% | 6.375%
Common equity tier 1 capital, For well capitalized purpose, Amount | $ 255,321 | $ 207,528
Common equity tier 1 capital, For well capitalized purposes, Ratio | 6.50% | 6.50%
Tier 1 capital (to average assets), Actual, Amount | $ 462,025 | $ 378,899
Tier 1 capital (to average assets), Actual, Ratio | 9.52% | 9.34%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 194,081 | $ 162,327
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 | $ 194,081 | $ 162,327
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 | $ 242,602 | $ 202,908
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 5.00% | 5.00%

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