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Regulatory Matters - Capital Ratios of Hanmi Financial and Bank (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Hanmi Financial [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital conservation buffer (percent) | 6.52% | 6.55%
Actual Capital, Total capital to risk-weighted assets | $ 695,483 | $ 684,272
Actual Capital, Tier 1 capital to risk-weighted assets | 564,376 | 553,970
Actual Capital, Common equity Tier 1 capital to risk-weighted assets | 544,983 | 537,950
Actual Capital, Tier 1 capital to average assets | $ 564,376 | $ 553,970
Actual Capital Ratio, Total capital to risk-weighted assets | 15.43% | 15.50%
Actual Capital Ratio, Tier 1 capital to risk-weighted assets | 12.52% | 12.55%
Actual Capital Ratio, Common equity Tier 1 capital to risk-weighted assets | 12.09% | 12.19%
Actual Capital Ratio, Tier 1 capital to average assets | 10.88% | 10.79%
Minimum Regulatory Requirement Capital, Total capital to risk-weighted assets | $ 360,582 | $ 353,171
Minimum Regulatory Requirement Capital, Tier 1 capital to risk-weighted assets | 270,436 | 264,878
Minimum Regulatory Requirement Capital, Common equity Tier 1 capital to risk-weighted assets | 202,827 | 198,658
Minimum Regulatory Requirement Capital, Tier 1 capital to average assets | $ 207,452 | $ 205,344
Minimum Regulatory Requirement Ratio for Total capital to risk-weighted assets | 8.00% | 8.00%
Minimum Regulatory Requirement Ratio for Tier 1 capital to risk-weighted assets | 6.00% | 6.00%
Minimum Regulatory Requirement Ratio for Common equity Tier 1 capital to risk-weighted assets | 4.50% | 4.50%
Minimum Regulatory Requirement Ratio for Tier 1 capital to average assets | 4.00% | 4.00%
Hanmi Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital conservation buffer (percent) | 7.13% | 7.20%
Actual Capital, Total capital to risk-weighted assets | $ 681,539 | $ 670,896
Actual Capital, Tier 1 capital to risk-weighted assets | 648,439 | 638,557
Actual Capital, Common equity Tier 1 capital to risk-weighted assets | 648,439 | 638,557
Actual Capital, Tier 1 capital to average assets | $ 648,439 | $ 638,557
Actual Capital Ratio, Total capital to risk-weighted assets | 15.13% | 15.20%
Actual Capital Ratio, Tier 1 capital to risk-weighted assets | 14.39% | 14.47%
Actual Capital Ratio, Common equity Tier 1 capital to risk-weighted assets | 14.39% | 14.47%
Actual Capital Ratio, Tier 1 capital to average assets | 12.51% | 12.44%
Minimum Regulatory Requirement Capital, Total capital to risk-weighted assets | $ 360,395 | $ 353,091
Minimum Regulatory Requirement Capital, Tier 1 capital to risk-weighted assets | 270,296 | 264,818
Minimum Regulatory Requirement Capital, Common equity Tier 1 capital to risk-weighted assets | 202,722 | 198,614
Minimum Regulatory Requirement Capital, Tier 1 capital to average assets | $ 207,361 | $ 205,385
Minimum Regulatory Requirement Ratio for Total capital to risk-weighted assets | 8.00% | 8.00%
Minimum Regulatory Requirement Ratio for Tier 1 capital to risk-weighted assets | 6.00% | 6.00%
Minimum Regulatory Requirement Ratio for Common equity Tier 1 capital to risk-weighted assets | 4.50% | 4.50%
Minimum Regulatory Requirement Ratio for Tier 1 capital to average assets | 4.00% | 4.00%
Minimum to Be Categorized as Well Capitalized Capital, Total capital to risk-weighted assets | $ 450,494 | $ 441,364
Minimum to Be Categorized as Well Capitalized Capital, Tier 1 capital to risk-weighted assets | 360,395 | 353,091
Minimum to Be Categorized as Well Capitalized Capital, Common equity Tier 1 capital to risk-weighted assets | 292,821 | 286,886
Minimum to Be Categorized as Well Capitalized Capital, Tier 1 capital to average assets | $ 259,201 | $ 256,731
Minimum to Be Categorized as Well Capitalized Ratio, Total capital to risk-weighted assets | 10.00% | 10.00%
Minimum to Be Categorized as Well Capitalized Ratio, Tier 1 capital to risk-weighted assets | 8.00% | 8.00%
Minimum to Be Categorized as Well Capitalized Ratio, Common equity Tier 1 capital to risk-weighted assets | 6.50% | 6.50%
Minimum to Be Categorized as Well Capitalized Ratio, Tier 1 capital to average assets | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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