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Loans Held for Investment - Narrative (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2023
USD ($)
loan
area
grade
borrower
Dec. 31, 2022
USD ($)
loan
Loans Held for Investment      
Servicing rights retained from guaranteed portion of SBA loans sold   $ 1,600,000 $ 3,000,000
Valuation allowance for servicing assets   0 0
Accrued expenses and other liabilities   216,596,000 206,023,000
Unpaid principal balance for loans and participations serviced for others   373,800,000 463,400,000
Secured loans limit to one borrower   834,600,000  
Unsecured loans limit to one borrower   500,800,000  
Aggregate outstanding balance of loans to one borrower of secured credit   $ 269,400,000  
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   $ 24,800,000 30,900,000
ACL attributable to individually evaluated loans   0 $ 1,700,000
Modified loans with subsequent default   0  
Number of TDR loans modified | loan     5
Loans held for investment   13,289,020,000 $ 14,676,298,000
Total Nonaccrual Loans   24,817,000 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
Total recorded balance of loans modified as TDR     16,100,000
Financial Asset Acquired with Credit Deterioration      
Loans Held for Investment      
Loans held for investment   359,300,000 422,700,000
Discounted Cash Flow Approach      
Loans Held for Investment      
Individually evaluated loans   12,600,000 0
Valuation Technique, Collateral Underlying Value      
Loans Held for Investment      
Individually evaluated loans   12,200,000  
Commercial loans      
Loans Held for Investment      
Loan modifications to borrowers   12,595,000  
Loans held for investment   2,121,255,000 2,576,839,000
Total Nonaccrual Loans   14,534,000 4,497,000
Business loans secured by real estate      
Loans Held for Investment      
Loans held for investment   2,546,589,000 2,871,588,000
Total Nonaccrual Loans   8,666,000 12,666,000
SBA      
Loans Held for Investment      
Unpaid principal balance for loans and participations serviced for others   258,100,000 315,300,000
CRE owner-occupied & Commercial and industrial      
Loans Held for Investment      
Investment in TDR     $ 5,100,000
CRE owner-occupied      
Loans Held for Investment      
Number of TDR loans modified | loan     3
CRE owner-occupied | Business loans secured by real estate      
Loans Held for Investment      
Loans held for investment   2,191,334,000 $ 2,432,163,000
Total Nonaccrual Loans   $ 8,666,000 $ 11,475,000
CRE owner-occupied | Business loans secured by real estate | Extended Maturity      
Loans Held for Investment      
Number of loan modifications | loan   1,000  
Loan modifications to borrowers   $ 851,000  
Commercial and industrial      
Loans Held for Investment      
Number of borrowers with loan modifications | borrower   1  
Number of TDR loans modified | loan     1
Commercial and industrial | Commercial loans      
Loans Held for Investment      
Number of loan modifications | loan   2  
Number of borrowers with loan modifications | borrower   1  
Loan modifications to borrowers   $ 12,595,000  
Loans held for investment   1,790,608,000 $ 2,160,948,000
Total Nonaccrual Loans   13,976,000 $ 3,908,000
Franchise non-real estate secured      
Loans Held for Investment      
Number of TDR loans modified | loan     1
Investment in TDR     $ 11,000,000
Franchise non-real estate secured | Commercial loans      
Loans Held for Investment      
Loans held for investment   319,721,000 404,791,000
Multifamily Loan Securitization      
Loans Held for Investment      
Unpaid principal balance for loans and participations serviced for others   48,000,000 54,200,000
Multifamily Loan Securitization | Variable Interest Entity, Not Primary Beneficiary      
Loans Held for Investment      
Accrued expenses and other liabilities   $ 345,000 334,000
Multifamily Loan Securitization | Opus      
Loans Held for Investment      
Proceeds from sale of loans receivable $ 509,000,000    
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   $ 345,000 $ 334,000