Annual report pursuant to Section 13 and 15(d)

Liquidity - Additional Information (Detail)

v3.8.0.1
Liquidity - Additional Information (Detail)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2014
USD ($)
Financial_Institution
Dec. 31, 2012
USD ($)
Line of Credit Facility [Line Items]        
Cash on deposit with bank subsidiary $ 4,348,654,000 $ 3,809,737,000    
Percentage of borrowings from FHLB (up to) 1.41%      
Total borrowing capacity based on pledged collateral $ 802,900,000      
Borrowing capacity available based on pledged collateral 652,900,000      
Bank's FHLB borrowings 150,000,000 315,000,000    
Borrowings 0      
Line of credit     $ 95,000,000  
Number of financial institutions | Financial_Institution     3  
Hanmi Bank [Member]        
Line of Credit Facility [Line Items]        
Cash on deposit with bank subsidiary 13,100,000      
Broker deposits $ 187,300,000      
Percentage of borrowings from FHLB (up to) 30.00%      
Total borrowing capacity based on pledged collateral $ 802,900,000 736,600,000    
Borrowing capacity available based on pledged collateral 652,900,000 421,600,000    
Bank's FHLB borrowings 150,000,000 $ 315,000,000    
Amount available from borrowing source 8,500,000      
Carrying value for loans pledged by Bank 9,000,000      
Borrowings $ 0      
Maximum borrowing capacity of line of credit       $ 100,000,000