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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($) $ in Thousands | Dec. 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 | $ 548,364 | $ 427,616
Total capital (to risk-weighted assets), Actual, Ratio | 13.95% | 13.39%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 314,395 | $ 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 | $ 412,644 | $ 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 | $ 530,643 | $ 409,760
Tier 1 capital (to average assets), Actual, Ratio | 13.50% | 12.83%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 235,796 | $ 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 | $ 334,044 | $ 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 | $ 473,150 | $ 371,297
Common equity tier 1 capital, Actual Ratio | 12.04% | 11.63%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 176,846 | $ 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 | $ 275,094 | $ 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 | $ 530,643 | $ 409,760
Tier 1 capital (to average assets), Actual, Ratio | 10.50% | 10.12%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 202,111 | $ 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 | $ 202,111 | $ 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 | $ 497,227 | $ 396,755
Total capital (to risk-weighted assets), Actual, Ratio | 12.65% | 12.43%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 314,452 | $ 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 | $ 412,718 | $ 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 | $ 393,065 | $ 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 | $ 479,506 | $ 378,899
Tier 1 capital (to average assets), Actual, Ratio | 12.20% | 11.87%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 235,823 | $ 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 | $ 334,082 | $ 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 | $ 314,430 | $ 255,420
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 8.00% | 8.00%
Common equity tier 1 capital, Actual Amount | $ 479,506 | $ 378,899
Common equity tier 1 capital, Actual Ratio | 12.20% | 11.87%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 176,867 | $ 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 | $ 275,126 | $ 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 | $ 255,475 | $ 207,528
Common equity tier 1 capital, For well capitalized purposes, Ratio | 6.50% | 6.50%
Tier 1 capital (to average assets), Actual, Amount | $ 479,506 | $ 378,899
Tier 1 capital (to average assets), Actual, Ratio | 9.49% | 9.34%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 202,110 | $ 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 | $ 202,110 | $ 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 | $ 252,638 | $ 202,908
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 5.00% | 5.00%

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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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