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Loans Held for Investment - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Dec. 23, 2016
USD ($)
Jul. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
loan
Sep. 30, 2020
USD ($)
loan
area
grade
Sep. 30, 2019
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Jun. 30, 2020
USD ($)
Jun. 01, 2020
USD ($)
Jan. 01, 2020
USD ($)
Loans Held for Investment                        
Loans held for investment $ 13,450,840,000 $ 8,722,311,000     $ 13,450,840,000   $ 13,450,840,000   $ 8,722,311,000      
Proceeds from loans held for sale previously classified as portfolio loans             1,283,214,000 $ 76,579,000        
Servicing rights retained from guaranteed portion of SBA loans sold 5,900,000 7,700,000     5,900,000   5,900,000   7,700,000      
Accrued expenses and other liabilities 282,905,000 131,367,000     282,905,000   282,905,000   131,367,000      
Unpaid principal balance for loans and participations serviced for others 727,200,000 633,800,000     727,200,000   727,200,000   633,800,000      
Secured loans limit to one borrower 800,100,000       800,100,000   800,100,000          
Unsecured loans limit to one borrower 480,100,000       480,100,000   480,100,000          
Aggregate outstanding balance of loans to one borrower of secured credit 126,400,000       126,400,000   $ 126,400,000          
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 26,500,000 22,842,000     26,500,000   $ 26,500,000   22,842,000      
ACL attributable to individually evaluated loans 2,000,000.0 0     2,000,000.0   2,000,000.0   0      
Loans on nonaccrual status 26,500,000       $ 26,500,000   $ 26,500,000          
Loans 90 days or more past due and still accruing   $ 0             $ 0      
Number of loans modified | loan         0 0 0 0        
Number of TDR loans | loan   2             2      
Premodification TDR   $ 3,000,000.0                    
Number of loans, subsequent default | loan         0 0 0 0        
Accounting standards update [Extensible List]                 us-gaap:AccountingStandardsUpdate201613Member      
Total nonaccrual loans 27,214,000 8,500,000     $ 27,214,000   $ 27,214,000   $ 8,500,000      
Consumer mortgage loans collateralized by residential real estate, foreclosure proceedings in process $ 0 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 loans modified | loan 54                      
Number of TDR loans | loan 0       0   0          
Total balance of loans modified $ 118,300,000       $ 118,300,000   $ 118,300,000          
Percentage of total loans held for investment 0.90%       0.90%   0.90%          
Opus Bank | COVID-19 Related Loan Modifications                        
Loans Held for Investment                        
Number of loans modified | loan 12                      
Total balance of loans modified $ 24,500,000       $ 24,500,000   $ 24,500,000          
Discounted cash flow approach                        
Loans Held for Investment                        
Individually evaluated loans 8,800,000       8,800,000   8,800,000          
Underlying value of the collateral                        
Loans Held for Investment                        
Individually evaluated loans 17,700,000       17,700,000   17,700,000          
Secured Debt                        
Loans Held for Investment                        
Aggregate outstanding balance of loans to one borrower of secured credit 101,500,000       101,500,000   101,500,000          
Unsecured Debt                        
Loans Held for Investment                        
Aggregate outstanding balance of loans to one borrower of secured credit 24,900,000       24,900,000   24,900,000          
Opus Bank | Opus Bank                        
Loans Held for Investment                        
Loans held for investment                     $ 5,940,000,000  
Multifamily Loan Securitization                        
Loans Held for Investment                        
Unpaid principal balance for loans and participations serviced for others 111,100,000       111,100,000   111,100,000          
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 437,400,000 475,300,000     437,400,000   437,400,000   475,300,000      
Commercial loans                        
Loans Held for Investment                        
Loans held for investment 2,353,723,000 1,975,053,000     2,353,723,000   2,353,723,000   1,975,053,000      
Total nonaccrual loans 14,578,000       14,578,000   14,578,000          
Commercial loans | SBA PPP                        
Loans Held for Investment                        
Loans held for investment 0       0   0     $ 1,130,000,000    
Proceeds from loans held for sale previously classified as portfolio loans       $ 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 1,820,995,000 1,393,270,000     1,820,995,000   1,820,995,000   1,393,270,000      
Individually evaluated loans   7,529,000             7,529,000      
ACL attributable to individually evaluated loans   $ 0             $ 0      
Total nonaccrual loans $ 6,099,000       $ 6,099,000   $ 6,099,000