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Income Taxes - Summary of loss carryforwards by jurisdiction (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Federal    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount $ 6,444 $ 7,090
Net operating loss carry-forwards, annual limitation 646 646
Federal | Saehan Bank (acquired by Wilshire) | Ownership Change    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 2,035 2,261
Net operating loss carry-forwards, annual limitation 226 226
Federal | Pacific International Bank    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 4,409 4,829
Net operating loss carry-forwards, annual limitation 420 420
State    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 2,488 2,488
Net operating loss carry-forwards, annual limitation 0 0
State | Saehan Bank (acquired by Wilshire) | Ownership Change    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 2,488 2,488
Net operating loss carry-forwards, annual limitation 0 0
State | Pacific International Bank    
Operating Loss Carryforwards [Line Items]    
Net operating loss carry-forwards, remaining amount 0 0
Net operating loss carry-forwards, annual limitation $ 0 $ 0