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Loans - Narrative (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Dec. 23, 2016
USD ($)
Jul. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
loan
area
grade
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Jun. 30, 2020
USD ($)
Jun. 01, 2020
USD ($)
Jan. 01, 2020
USD ($)
Loans Held for Investment                    
Loans held for investment $ 13,236,433,000 $ 8,722,311,000     $ 13,236,433,000 $ 8,722,311,000        
Aggregate amortized cost of SBA PPP loan portfolio sold         1,338,325,000 86,313,000 $ 125,485,000      
Servicing rights retained from guaranteed portion of SBA loans sold 5,300,000 7,700,000     5,300,000 7,700,000        
Valuation allowance for servicing assets 0 0     0 0        
Accrued expenses and other liabilities 243,207,000 131,367,000     243,207,000 131,367,000        
Unpaid principal balance for loans and participations serviced for others 686,000,000.0 633,800,000     686,000,000.0 633,800,000        
Secured loans limit to one borrower 821,300,000       821,300,000          
Unsecured loans limit to one borrower 492,800,000       492,800,000          
Aggregate outstanding balance of loans to one borrower of secured credit 165,400,000       $ 165,400,000          
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 29,200,000 22,842,000     $ 29,200,000 22,842,000        
ACL attributable to individually evaluated loans 126,000 0     126,000 0        
Loans on nonaccrual status 29,200,000       29,200,000          
Loans 90 days or more past due and still accruing $ 0 0     $ 0 $ 0        
Premodification TDR   $ 3,000,000.0                
Number of TDR loans modified | loan         0          
Number of TDR loans | loan 0 2     0 2        
Number of TDR loans with payment defaults after modification | loan         0 0        
Nonaccrual loans $ 29,209,000 $ 8,500,000     $ 29,209,000 $ 8,500,000        
Consumer mortgage loans collateralized by residential real estate, foreclosure proceedings in process $ 0 0     $ 0 0        
Impact of CECL Adoption                    
Loans Held for Investment                    
Loans held for investment                   $ 55,700,000
Impact of CECL Adoption | Financial Asset Acquired with Credit Deterioration                    
Loans Held for Investment                    
Loans held for investment                   $ 0
COVID-19 Related Loan Modifications                    
Loans Held for Investment                    
Number of TDR loans modified | loan 52                  
Number of TDR loans | loan 0       0          
Total balance of loans modified $ 79,500,000       $ 79,500,000          
Percentage of total loans held for investment 0.60%       0.60%          
Opus | COVID-19 Related Loan Modifications                    
Loans Held for Investment                    
Number of TDR loans modified | loan 5                  
Total balance of loans modified $ 3,100,000       $ 3,100,000          
Valuation Technique, Discounted Cash Flow [Member]                    
Loans Held for Investment                    
Individually evaluated loans 15,200,000       15,200,000          
Underlying value of the collateral                    
Loans Held for Investment                    
Individually evaluated loans $ 14,000,000.0       $ 14,000,000.0          
Opus | Opus                    
Loans Held for Investment                    
Loans held for investment                 $ 5,940,000,000  
Multifamily Loan Securitization, Liability | Variable Interest Entity, Not Primary Beneficiary                    
Loans Held for Investment                    
Maximum loss, percentage of loans 10.00%       10.00%          
Multifamily Loan Securitization                    
Loans Held for Investment                    
Unpaid principal balance for loans and participations serviced for others $ 99,400,000       $ 99,400,000          
Multifamily Loan Securitization | Variable Interest Entity, Not Primary Beneficiary                    
Loans Held for Investment                    
Accrued expenses and other liabilities 448,000 0     448,000 0        
Multifamily Loan Securitization | Opus                    
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 421,700,000 475,300,000     421,700,000 475,300,000        
Commercial loans                    
Loans Held for Investment                    
Loans held for investment 2,229,588,000 1,975,053,000     2,229,588,000 1,975,053,000        
Nonaccrual loans 17,919,000       17,919,000          
Commercial loans | SBA PPP                    
Loans Held for Investment                    
Loans held for investment 0       0     $ 1,130,000,000    
Aggregate amortized cost of SBA PPP loan portfolio sold       $ 1,130,000,000            
Gain (loss) on sale of SBA PPP loan portfolio       $ 18,900,000            
Commercial loans | Commercial and industrial                    
Loans Held for Investment                    
Loans held for investment 1,768,834,000 1,393,270,000     1,768,834,000 1,393,270,000        
Individually evaluated loans   7,529,000       7,529,000        
ACL attributable to individually evaluated loans   0       0        
Premodification TDR   1,300,000                
TDR charged off         1,300,000          
Nonaccrual loans 3,974,000       3,974,000          
Commercial loans | Franchise non-real estate secured                    
Loans Held for Investment                    
Loans held for investment 444,797,000 564,357,000     444,797,000 564,357,000        
Individually evaluated loans   10,834,000       10,834,000        
ACL attributable to individually evaluated loans   0       $ 0        
Premodification TDR   $ 1,700,000                
TDR charged off         344,000          
Nonaccrual loans $ 13,238,000       $ 13,238,000