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Loans Held for Investment - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2021
loan
Sep. 30, 2022
USD ($)
loan
area
grade
Sep. 30, 2021
loan
Dec. 31, 2021
USD ($)
loan
Loans Held for Investment            
Servicing rights retained from guaranteed portion of SBA loans sold   $ 3,400,000   $ 3,400,000   $ 3,800,000
Accrued expenses and other liabilities   206,386,000   206,386,000   203,962,000
Unpaid principal balance for loans and participations serviced for others   491,000,000   491,000,000   565,800,000
Secured loans limit to one borrower   813,100,000   813,100,000    
Unsecured loans limit to one borrower   487,900,000   487,900,000    
Aggregate outstanding balance of loans to one borrower of secured credit   257,300,000   $ 257,300,000    
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   60,500,000   $ 60,500,000   31,300,000
ACL attributable to individually evaluated loans   4,400,000   $ 4,400,000   $ 1,500,000
Number of loans modified | loan       5   6
Total recorded balance of loans modified as TDR   16,300,000   $ 16,300,000   $ 17,300,000
Total nonaccrual loans   60,464,000   60,464,000   31,273,000
Loans 90 days or more past due and still accruing   0   0   0
Consumer mortgage loans collateralized by residential real estate, foreclosure proceedings in process   0   0   0
Financial Asset Acquired with Credit Deterioration            
Loans Held for Investment            
Loans held for investment   451,600,000   451,600,000   567,600,000
Discounted Cash Flow Approach            
Loans Held for Investment            
Individually evaluated loans   11,300,000   11,300,000   12,400,000
Underlying Value of the Collateral            
Loans Held for Investment            
Individually evaluated loans   $ 49,200,000   $ 49,200,000   18,900,000
Multifamily Loan Securitization, Liability | Variable Interest Entity, Not Primary Beneficiary            
Loans Held for Investment            
Maximum loss, percentage of loans   10.00%   10.00%    
Accrued expenses and other liabilities   $ 338,000   $ 338,000   338,000
Multifamily Loan Securitization            
Loans Held for Investment            
Unpaid principal balance for loans and participations serviced for others   57,400,000   57,400,000   78,100,000
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   328,600,000   328,600,000   365,600,000
CRE owner-occupied & Commercial and industrial            
Loans Held for Investment            
Total recorded balance of loans modified as TDR   $ 5,100,000   $ 5,100,000   $ 5,200,000
CRE owner-occupied            
Loans Held for Investment            
Number of loans modified | loan       3   3
Number of loans, subsequent default | loan   3 3 3 3  
Commercial and industrial            
Loans Held for Investment            
Number of loans modified | loan       1   1
Number of loans, subsequent default | loan   1 1 1 1  
Franchise non-real estate secured            
Loans Held for Investment            
Number of loans modified | loan       1   2
Total recorded balance of loans modified as TDR   $ 11,200,000   $ 11,200,000   $ 12,100,000