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Loans and Leases - Narrative (Details)
3 Months Ended 9 Months Ended 22 Months Ended
Sep. 30, 2022
USD ($)
contract
Sep. 30, 2021
USD ($)
contract
Sep. 30, 2022
USD ($)
contract
Sep. 30, 2021
USD ($)
contract
Dec. 31, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Nonaccrual loans and leases $ 89,742,000 $ 64,507,000 $ 89,742,000 $ 64,507,000 $ 61,174,000      
Allowance for Loan and Lease Losses, Period Increase (Decrease)     600,000          
Provision for credit losses (3,000,000) 21,500,000 9,000,000 146,500,000        
Gross loans and leases held for investment 27,775,962,000   27,775,962,000   23,026,308,000      
Loans and Leases Receivable, Allowance 189,327,000 203,733,000 189,327,000 203,733,000 200,564,000 $ 188,705,000 $ 225,600,000 $ 348,181,000
Loans held for investment, net $ 27,660,041,000 $ 20,511,020,000 $ 27,660,041,000 $ 20,511,020,000 22,941,548,000      
Number of loans | contract 16 8 40 51        
Pre-Modification Outstanding Recorded Investment $ 5,769,000 $ 4,248,000 $ 8,906,000 $ 56,576,000        
Real Estate Mortgage                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Nonaccrual loans and leases 68,722,000 33,162,000 68,722,000 33,162,000 39,832,000      
Provision for credit losses 5,018,000 11,344,000 17,546,000 47,466,000        
Gross loans and leases held for investment 14,656,888,000   14,656,888,000   11,189,278,000      
Loans and Leases Receivable, Allowance 78,896,000 96,203,000 78,896,000 96,203,000 98,053,000 85,287,000 107,013,000 138,342,000
Loans held for investment, net 14,630,749,000 9,580,957,000 14,630,749,000 9,580,957,000 11,178,720,000      
Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Nonaccrual loans and leases 13,552,000 10,932,000 13,552,000 10,932,000 16,213,000      
Provision for credit losses 3,284,000 9,792,000 1,248,000 77,373,000        
Gross loans and leases held for investment 8,288,359,000   8,288,359,000   7,888,068,000      
Loans and Leases Receivable, Allowance 51,221,000 47,497,000 51,221,000 47,497,000 48,718,000 $ 54,031,000 $ 57,697,000 $ 126,403,000
Loans held for investment, net 8,271,182,000 $ 6,872,222,000 8,271,182,000 $ 6,872,222,000 7,868,051,000      
Residential Real Estate [Member] | Real Estate Mortgage                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Nonaccrual loans and leases $ 25,950,000   $ 25,950,000   12,292,000      
Number of Loans 1   1          
Financing Receivable, Troubled Debt Restructuring, Subsequent Default $ 97,000   $ 97,000          
Loans held for investment, net $ 10,860,043,000   $ 10,860,043,000   7,416,421,000      
Number of loans | contract 10 3 11 4        
Pre-Modification Outstanding Recorded Investment $ 3,596,000 $ 297,000 $ 3,903,000 $ 518,000        
Finance Receivable, Payroll Protection Program Loan [Member] | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans held for investment, net 13,300,000   13,300,000          
Credit Concentration Risk                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Nonaccrual loans and leases 30,800,000   $ 30,800,000          
Credit Concentration Risk | Nonaccrual Loans And Leases Benchmark | Fair Value, Concentration of Risk, All Financial Instruments                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of nonaccrual loans and leases     34.00%          
Nonaccrual                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Receivable, 90 or more days past due 38,100,000   $ 38,100,000   18,500,000      
Receivable, 30-89 days past due 2,500,000   2,500,000   6,300,000      
Financing receivable, nonaccrual status, current 49,100,000   49,100,000   36,400,000      
Payment Protection Program 2020 to 2021                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Proceeds from Loan Originations         1,650,000,000      
Other Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Number of Loans | contract   2   2        
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   $ 95,000   $ 95,000        
Other Commercial | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Nonaccrual loans and leases 7,616,000   7,616,000   11,950,000      
Loans held for investment, net $ 1,115,442,000   $ 1,115,442,000   1,471,981,000      
Number of loans | contract 2 2 21 37        
Pre-Modification Outstanding Recorded Investment $ 102,000 $ 85,000 $ 1,233,000 $ 48,694,000        
Venture Capital Loans | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Nonaccrual loans and leases 3,809,000   3,809,000   2,799,000      
Loans held for investment, net $ 2,001,086,000   $ 2,001,086,000   2,320,593,000      
Number of loans | contract 2 2 5 4        
Pre-Modification Outstanding Recorded Investment $ 1,649,000 $ 2,382,000 $ 3,330,000 $ 4,502,000        
Asset-based | Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Nonaccrual loans and leases 2,127,000   2,127,000   1,464,000      
Number of Loans | contract   1   1        
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   $ 479,000   $ 479,000        
Loans held for investment, net $ 5,154,654,000   $ 5,154,654,000   $ 4,075,477,000      
Number of loans | contract 0 1 0 2        
Pre-Modification Outstanding Recorded Investment $ 0 $ 1,484,000 $ 0 $ 1,987,000