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Loans Held for Investment - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 23, 2016
USD ($)
Jun. 30, 2021
USD ($)
loan
Jun. 30, 2020
USD ($)
loan
Jun. 30, 2021
USD ($)
loan
grade
area
Jun. 30, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Loans Held for Investment            
Servicing rights retained from guaranteed portion of SBA loans sold   $ 4,400,000   $ 4,400,000   $ 5,300,000
Accrued expenses and other liabilities   224,348,000   224,348,000   243,207,000
Unpaid principal balance for loans and participations serviced for others   618,300,000   618,300,000   686,000,000.0
Secured loans limit to one borrower   833,200,000   833,200,000    
Unsecured loans limit to one borrower   500,000,000.0   500,000,000.0    
Aggregate outstanding balance of loans to one borrower of secured credit   177,600,000   $ 177,600,000    
Number of areas where the entity's credit quality is maintained and credit risk managed | area       2    
Number of pass scale grades | grade       6    
Individually evaluated loans   34,400,000   $ 34,400,000   29,200,000
ACL attributable to individually evaluated loans           126,000
Loans on nonaccrual status   34,400,000   34,400,000   $ 29,200,000
Total recorded balance of loans modified as TDR   $ 17,800,000   $ 17,800,000    
Number of loans modified | loan           0
Number of TDR loans | loan   6   6    
Number of loans, subsequent default | loan     0   0  
Total nonaccrual loans   $ 34,387,000   $ 34,387,000   $ 29,209,000
Interest income on nonaccrual loans   0 $ 0 0 $ 0  
Consumer mortgage loans collateralized by residential real estate, foreclosure proceedings in process   0   $ 0   $ 0
COVID-19 Related Loan Modifications            
Loans Held for Investment            
Number of loans modified | loan       1   52
Total balance of loans modified within their OCVID-19 modification period   819,000   $ 819,000   $ 79,500,000
Percentage of total loans held for investment           0.60%
Discounted Cash Flow Approach            
Loans Held for Investment            
Individually evaluated loans   13,100,000   13,100,000   $ 15,200,000
Underlying Value of the Collateral            
Loans Held for Investment            
Individually evaluated loans   $ 21,300,000   $ 21,300,000   14,000,000.0
Multifamily Loan Securitization, Liability | Variable Interest Entity, Not Primary Beneficiary            
Loans Held for Investment            
Maximum loss, percentage of loans   10.00%   10.00%    
Multifamily Loan Securitization            
Loans Held for Investment            
Unpaid principal balance for loans and participations serviced for others   $ 94,600,000   $ 94,600,000   99,400,000
Multifamily Loan Securitization | Variable Interest Entity, Not Primary Beneficiary            
Loans Held for Investment            
Accrued expenses and other liabilities   448,000   448,000   448,000
Multifamily Loan Securitization | Opus Bank            
Loans Held for Investment            
Proceeds from sale of loans receivable $ 509,000,000          
SBA            
Loans Held for Investment            
Unpaid principal balance for loans and participations serviced for others   $ 387,800,000   387,800,000   $ 421,700,000
CRE owner-occupied & Commercial and industrial            
Loans Held for Investment            
Total recorded balance of postmodification TDR       $ 5,300,000    
CRE owner-occupied            
Loans Held for Investment            
Number of loans modified | loan   3   3    
Commercial and industrial            
Loans Held for Investment            
Number of loans modified | loan   1   1    
Franchise non-real estate secured            
Loans Held for Investment            
Number of loans modified | loan   2   2    
Total recorded balance of postmodification TDR   $ 12,600,000   $ 12,600,000