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Loans Held for Investment - Narrative (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 23, 2016
USD ($)
Sep. 30, 2021
USD ($)
loan
Mar. 31, 2021
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
area
grade
Sep. 30, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Loans Held for Investment              
Servicing rights retained from guaranteed portion of SBA loans sold   $ 4,100,000     $ 4,100,000   $ 5,300,000
Accrued Liabilities and Other Liabilities   216,688,000     216,688,000   243,207,000
Unpaid principal balance for loans and participations serviced for others   590,900,000     590,900,000   686,000,000
Secured loans limit to one borrower   838,400,000     838,400,000    
Unsecured loans limit to one borrower   503,000,000     503,000,000    
Aggregate outstanding balance of loans to one borrower of secured credit   176,800,000     $ 176,800,000    
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   35,100,000     $ 35,100,000   29,200,000
ACL attributable to individually evaluated loans   571,000     571,000   126,000
Loans on nonaccrual status   35,100,000     35,100,000   29,200,000
Total recorded balance of loans modified as TDR   $ 17,600,000     $ 17,600,000    
Number of loans modified | loan   0 0        
Number of TDR loans | loan   6     6    
Number of loans, subsequent default | loan       0   0  
Total nonaccrual loans   $ 35,090,000     $ 35,090,000   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   0         52
Total balance of loans modified within their OCVID-19 modification period             $ 79,500,000
Percentage of total loans held for investment             0.60%
Discounted Cash Flow Approach              
Loans Held for Investment              
Individually evaluated loans   $ 12,800,000     12,800,000   $ 15,200,000
Underlying Value of the Collateral              
Loans Held for Investment              
Individually evaluated loans   $ 22,300,000     $ 22,300,000   14,000,000
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   $ 85,200,000     $ 85,200,000   99,400,000
Multifamily Loan Securitization | Variable Interest Entity, Not Primary Beneficiary              
Loans Held for Investment              
Accrued Liabilities 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   $ 372,700,000     372,700,000   $ 421,700,000
CRE owner-occupied & Commercial and industrial              
Loans Held for Investment              
Total recorded balance of postmodification TDR         $ 5,200,000    
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   $ 12,300,000     $ 12,300,000