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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
May 24, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]              
Loans   $ 1,217,687   $ 1,084,384      
Servicing assets   12,389   7,360      
Accrued interest receivable   3,931   3,985      
Loans receivable, allowance   $ 14,134 $ 14,687 $ 15,352 $ 14,164 $ 12,764 $ 10,050
Hana Small Business Lending Inc              
Summary Of Significant Accounting Policies [Line Items]              
Payments to purchase loan portfolio $ 97,631            
Loans 100,003            
Fair value discount of loans 8,867            
Servicing assets 6,097            
Accrued interest receivable 398            
Purchased Performing Loans | Hana Small Business Lending Inc              
Summary Of Significant Accounting Policies [Line Items]              
Loans 100,000            
Fair value discount of loans $ 8,900            
Loans receivable, allowance     $ 0