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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($) $ in Thousands | Mar. 31, 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 | $ 509,214 | $ 427,616
Total capital (to risk-weighted assets), Actual, Ratio | 13.25% | 13.39%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 307,362 | $ 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 | $ 403,412 | $ 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 | $ 491,302 | $ 409,760
Tier 1 capital (to average assets), Actual, Ratio | 12.79% | 12.83%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 230,521 | $ 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 | $ 326,572 | $ 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 | $ 433,809 | $ 371,297
Common equity tier 1 capital, Actual Ratio | 11.29% | 11.63%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 172,890 | $ 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 | $ 268,941 | $ 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 | $ 491,302 | $ 409,760
Tier 1 capital (to average assets), Actual, Ratio | 11.85% | 10.12%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 165,789 | $ 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 | $ 165,789 | $ 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 | $ 472,621 | $ 396,755
Total capital (to risk-weighted assets), Actual, Ratio | 12.30% | 12.43%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 307,361 | $ 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 | $ 403,411 | $ 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 | $ 384,201 | $ 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 | $ 454,709 | $ 378,899
Tier 1 capital (to average assets), Actual, Ratio | 11.84% | 11.87%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 230,520 | $ 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 | $ 326,570 | $ 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 | $ 307,360 | $ 255,420
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 8.00% | 8.00%
Common equity tier 1 capital, Actual Amount | $ 454,709 | $ 378,899
Common equity tier 1 capital, Actual Ratio | 11.84% | 11.87%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 172,890 | $ 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 | $ 268,940 | $ 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 | $ 249,730 | $ 207,528
Common equity tier 1 capital, For well capitalized purposes, Ratio | 6.50% | 6.50%
Tier 1 capital (to average assets), Actual, Amount | $ 454,709 | $ 378,899
Tier 1 capital (to average assets), Actual, Ratio | 10.99% | 9.34%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 165,523 | $ 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 | $ 165,523 | $ 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 | $ 206,904 | $ 202,908
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 5.00% | 5.00%

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