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Loans Held for Investment - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Mar. 31, 2023
USD ($)
grade
area
Mar. 31, 2022
loan
Dec. 31, 2022
USD ($)
loan
Loans Held for Investment        
Servicing rights retained from guaranteed portion of SBA loans sold   $ 2,600,000   $ 3,000,000
Accrued expenses and other liabilities   191,229,000   206,023,000
Unpaid principal balance for loans and participations serviced for others   444,400,000   463,400,000
Secured loans limit to one borrower   836,500,000    
Unsecured loans limit to one borrower   501,900,000    
Aggregate outstanding balance of loans to one borrower of secured credit   $ 171,200,000    
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   $ 24,900,000   30,900,000
ACL attributable to individually evaluated loans   4,000,000   1,700,000
Loans held for investment   14,171,784,000   14,676,298,000
Total nonaccrual loans   24,872,000   30,905,000
Loans 90 days or more past due and still accruing   0   0
Consumer mortgage loans collateralized by residential real estate, foreclosure proceedings in process   0   $ 0
Number of loans modified | loan       5
Troubled debt restructuring       $ 16,100,000
Financial Asset Acquired with Credit Deterioration        
Loans Held for Investment        
Loans held for investment   413,000,000   422,700,000
Discounted Cash Flow Approach        
Loans Held for Investment        
Individually evaluated loans   $ 0   0
Multifamily Loan Securitization, Liability | Variable Interest Entity, Not Primary Beneficiary        
Loans Held for Investment        
Maximum loss, percentage of loans   10.00%    
Accrued expenses and other liabilities   $ 334,000   334,000
Multifamily Loan Securitization        
Loans Held for Investment        
Unpaid principal balance for loans and participations serviced for others   53,700,000   54,200,000
Multifamily Loan Securitization | Variable Interest Entity, Not Primary Beneficiary        
Loans Held for Investment        
Accrued expenses and other liabilities   334,000   334,000
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   $ 303,900,000   315,300,000
CRE owner-occupied & Commercial and industrial        
Loans Held for Investment        
Troubled debt restructuring       $ 5,100,000
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       1
Troubled debt restructuring       $ 11,000,000