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Loans Held for Investment - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Mar. 31, 2022
USD ($)
area
loan
grade
Mar. 31, 2021
USD ($)
loan
Dec. 31, 2021
USD ($)
Loans Held for Investment        
Servicing rights retained from guaranteed portion of SBA loans sold   $ 3,700,000   $ 3,800,000
Accrued expenses and other liabilities   219,329,000   203,962,000
Unpaid principal balance for loans and participations serviced for others   542,400,000   565,800,000
Secured loans limit to one borrower   823,300,000    
Unsecured loans limit to one borrower   494,000,000    
Aggregate outstanding balance of loans to one borrower of secured credit   $ 235,500,000    
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   $ 55,300,000   31,300,000
ACL attributable to individually evaluated loans   $ 1,200,000   1,500,000
Number of TDR loans | loan   6    
Total recorded balance of loans modified as TDR   $ 16,900,000   17,300,000
Premodification TDR     $ 0  
Number of loans, subsequent default | loan     0  
Total nonaccrual loans   55,309,000   31,273,000
Loans 90 days or more past due and still accruing   1,800,000   0
Consumer mortgage loans collateralized by residential real estate, foreclosure proceedings in process   0   0
Financial Asset Acquired with Credit Deterioration        
Loans Held for Investment        
Loans held for investment   542,400,000   567,600,000
Discounted Cash Flow Approach        
Loans Held for Investment        
Individually evaluated loans   11,800,000   12,400,000
Underlying Value of the Collateral        
Loans Held for Investment        
Individually evaluated loans   $ 43,500,000   18,900,000
Multifamily Loan Securitization, Liability | Variable Interest Entity, Not Primary Beneficiary        
Loans Held for Investment        
Maximum loss, percentage of loans   10.00%    
Multifamily Loan Securitization        
Loans Held for Investment        
Unpaid principal balance for loans and participations serviced for others   $ 75,900,000   78,100,000
Multifamily Loan Securitization | Variable Interest Entity, Not Primary Beneficiary        
Loans Held for Investment        
Accrued expenses and other liabilities   338,000   338,000
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   343,900,000   365,600,000
CRE owner-occupied & Commercial and industrial        
Loans Held for Investment        
Total recorded balance of postmodification TDR   $ 5,100,000   5,200,000
CRE owner-occupied        
Loans Held for Investment        
Number of loans modified | loan   3    
Commercial and industrial        
Loans Held for Investment        
Number of loans modified | loan   1    
Franchise non-real estate secured        
Loans Held for Investment        
Number of loans modified | loan   2    
Total recorded balance of postmodification TDR   $ 11,800,000   $ 12,100,000