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Liquidity - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Maximum [Member] | Mar. 15, 2013 Trust Preferred Securities [Member] | Apr. 30, 2013 Subsequent Events [Member] Trust Preferred Securities [Member] | Mar. 31, 2013 Hanmi Bank [Member] | Mar. 31, 2013 Fed Discount Window [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Redemption of preferred securities |  |  |  | $ 30.9 | $ 51.5 |  |
Amount of advances from the Federal Home Loan Bank (FHLB) | 2.8 | 2.9 |  |  |  |  |
Broker deposits |  |  |  |  |  | 0 |
Percent of borrowing from FHLB |  |  | 15.00% |  |  |  |
Total borrowing capacity based on pledged collateral | 367.4 | 275.1 |  |  |  |  |
Borrowing capacity available based on pledged collateral | 364.5 | 272.2 |  |  |  |  |
Bank's FHLB borrowing | 2.8 | 2.9 |  |  |  |  |
Borrowing percentage of total assets | 0.10% | 0.10% |  |  |  |  |
Amount available from borrowing source |  |  |  |  |  |  | 104.4
Carrying value for loans pledged by bank | 147.4 |  |  |  |  |  |
Borrowings | 0 |  |  |  |  |  |
Maximum borrowing capacity of line of credit |  | $ 100.0 |  |  |  |  |

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