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Income Taxes - Summary of loss carryforwards by jurisdiction (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Federal    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount $ 8,877 $ 10,020
Net operating loss carry-forwards, annual limitation 1,143 1,143
Federal | Saehan Bank [Member] | Ownership Change [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 2,714 2,940
Net operating loss carry-forwards, annual limitation 226 226
Federal | Korea First Bank of New York [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 494 991
Net operating loss carry-forwards, annual limitation 497 497
Federal | Pacific International Bancorp, Inc.    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 5,669 6,089
Net operating loss carry-forwards, annual limitation 420 420
State    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 2,714 2,940
Net operating loss carry-forwards, annual limitation 226 226
State | Saehan Bank [Member] | Ownership Change [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 2,714 2,940
Net operating loss carry-forwards, annual limitation 226 226
State | Korea First Bank of New York [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 0 0
Net operating loss carry-forwards, annual limitation 0 0
State | Pacific International Bancorp, Inc.    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 0 0
Net operating loss carry-forwards, annual limitation $ 0 $ 0