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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2014 Subsidiary | Dec. 31, 2015 USD ($) Branches | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2013 | Mar. 31, 2010 | Dec. 31, 2015 USD ($) Branches loan_pool | Dec. 31, 2014 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Percent of net loan recoveries to average loans |  | 0.06% |  |  |  |  | 0.06% |
Percent of nonperforming, non-PCI loans to all loans |  | 0.60% |  |  |  |  | 0.60% |
Percent of classified loans to all loans |  | 1.24% |  |  |  |  | 1.24% |
Allowance for loan losses of loans receivable | $ |  | $ 42,935 |  |  |  |  | $ 42,935 | $ 52,666
Percent of allowance for loan losses to all loans |  | 1.35% |  |  |  |  | 1.35% |
Period of utilization rate and historical loss rates used for breaking down commitments by loan type |  | 60 months |  | 48 months | 36 months | 24 months |  |
General loan pools [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Number of loan pools |  |  |  |  |  |  | 14 |
Homogeneous loan pools [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Number of loan pools |  |  |  |  |  |  | 3 |
Oldest four quarters [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Risk factor calculations |  |  |  | 46.00% | 17.00% | 40.00% |  |
Next four quarters [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Risk factor calculations |  |  |  | 31.00% | 33.00% |  |  |
Third four quarters [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Risk factor calculations |  |  |  | 15.00% |  |  |  |
Most recent four quarters [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Risk factor calculations |  |  |  | 8.00% | 50.00% | 60.00% |  |
Nonperforming Financing Receivable [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Delinquency period of loans with respect to interest or principal for discontinuance of accrual of interest income (less than) |  |  |  |  |  |  | 90 days |
Cash and Cash Equivalents [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Delinquency period of loans with respect to interest or principal for discontinuance of accrual of interest income (less than) |  |  |  |  |  |  | 90 days |
CANADA | Full Service [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Number of branches | Branches |  | 42 |  |  |  |  | 42 |
Chun Ha and All World To Chunha Holdings Corporation [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Number of subsidiaries sold | Subsidiary | 2 |  |  |  |  |  |  |
Hanmi Bank [Member] |  |  |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |  |  |
Number of shares exchanged for each of the Bank's share |  |  | 1 |  |  |  |  |

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