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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 ($)
Sep. 30, 2023
USD ($)
lendingRelationship
loan
Mar. 31, 2023
USD ($)
loan
Sep. 30, 2022
loan
Sep. 30, 2023
USD ($)
grade
area
Sep. 30, 2022
loan
Dec. 31, 2022
USD ($)
loan
borrowingRelationship
Loans Held for Investment              
Servicing rights retained from guaranteed portion of SBA loans sold   $ 2,000,000     $ 2,000,000   $ 3,000,000
Accrued expenses and other liabilities   281,057,000     281,057,000   206,023,000
Unpaid principal balance for loans and participations serviced for others   406,000,000     406,000,000   463,400,000
Secured loans limit to one borrower   825,800,000     825,800,000    
Unsecured loans limit to one borrower   495,500,000     495,500,000    
Aggregate outstanding balance of loans to one borrower of secured credit   169,200,000     $ 169,200,000    
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   25,500,000     $ 25,500,000   30,900,000
ACL attributable to individually evaluated loans   0     0   1,700,000
Loans held for investment   13,270,120,000     13,270,120,000   14,676,298,000
Total nonaccrual loans   25,458,000     25,458,000   30,905,000
Loans 90 days or more past due and still accruing             0
Consumer mortgage loans collateralized by residential real estate, foreclosure proceedings in process   0     0   $ 0
Preceding payment default   0     0    
Number of loans modified | loan             5
Troubled debt restructuring             $ 16,100,000
Commercial loans              
Loans Held for Investment              
Loans held for investment   1,934,491,000     1,934,491,000   2,576,839,000
Total nonaccrual loans   13,792,000     13,792,000   4,497,000
Loan modifications to borrowers         13,021,000    
Business loans secured by real estate              
Loans Held for Investment              
Loans held for investment   2,595,921,000     2,595,921,000   2,871,588,000
Total nonaccrual loans   9,999,000     9,999,000   12,666,000
Financial Asset Acquired with Credit Deterioration              
Loans Held for Investment              
Loans held for investment   387,400,000     387,400,000   422,700,000
Collateral Underlying Value              
Loans Held for Investment              
Individually evaluated loans   12,500,000     12,500,000    
Discounted Cash Flow Approach              
Loans Held for Investment              
Individually evaluated loans   $ 13,000,000     $ 13,000,000   0
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   $ 334,000     $ 334,000   334,000
Multifamily Loan Securitization              
Loans Held for Investment              
Unpaid principal balance for loans and participations serviced for others   50,800,000     50,800,000   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   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   272,500,000     272,500,000   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 3
CRE owner-occupied | Business loans secured by real estate              
Loans Held for Investment              
Loans held for investment   2,228,802,000     2,228,802,000   $ 2,432,163,000
Total nonaccrual loans   8,826,000     8,826,000   $ 11,475,000
CRE owner-occupied | Business loans secured by real estate | Term Extension              
Loans Held for Investment              
Number of loan modifcations | loan     1        
Loan modifications to borrowers     $ 851,000        
Extended term     4 months        
Commercial and industrial              
Loans Held for Investment              
Number of loans modified | loan       1   1 1
Number of borrowing relationships | borrowingRelationship             1
Commercial and industrial | Commercial loans              
Loans Held for Investment              
Loans held for investment   1,588,771,000     1,588,771,000   $ 2,160,948,000
Total nonaccrual loans   $ 13,254,000     13,254,000   $ 3,908,000
Number of lending relationships, nonaccrual addition reclass | lendingRelationship   1          
Nonaccrual addition reclass   $ 13,000,000          
Nonaccrual interest income reversal   $ 1,700,000          
Number of loan modifcations | loan   2          
Loan modifications to borrowers         13,021,000    
Franchise non-real estate secured              
Loans Held for Investment              
Number of loans modified | loan             1
Troubled debt restructuring             $ 11,000,000
Franchise non-real estate secured | Commercial loans              
Loans Held for Investment              
Loans held for investment   $ 335,053,000     $ 335,053,000   $ 404,791,000