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Loans and Leases - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual loans and leases $ 145,785 $ 87,124 $ 62,527  
Allowance for Loan and Lease Losses, Period Increase (Decrease) 9,800      
Provision for credit losses 11,000 (18,500)    
Loans and leases held for investment 25,755,961   25,796,714  
Loans and Leases Receivable, Allowance 291,503 210,055 281,687 $ 200,732
Loans held for investment, net 25,473,022 25,672,381 25,489,687  
Net (charge-offs) recoveries (1,184) (9,177)    
Real Estate Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual loans and leases 129,234 83,056 47,730  
Provision for credit losses 13,033 (31,809)    
Loans and leases held for investment 16,217,186   16,378,537  
Loans and Leases Receivable, Allowance 198,274 109,483 186,827 87,309
Loans held for investment, net 15,967,399 15,407,611 16,111,985  
Net (charge-offs) recoveries (1,586) (9,635)    
Real Estate Mortgage | Other Residential Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual loans and leases 61,754   31,041  
Loans held for investment, net 4,949,383   5,060,309  
Real Estate Mortgage | Other Residential Real Estate | Current        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Excluding Accrued Interest, Modified, Increase (Decrease) from Modification 2,200      
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual loans and leases 15,715 3,543 13,986  
Provision for credit losses (267) (16,492)    
Loans and leases held for investment 5,831,666   5,780,346  
Loans and Leases Receivable, Allowance 47,054 37,195 45,156 $ 52,849
Loans held for investment, net 5,820,567 5,229,107 5,765,307  
Net (charge-offs) recoveries 2,165 $ 838    
Credit Concentration Risk        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual loans and leases $ 46,300      
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 32.00%      
Nonaccrual        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Receivable, 90 or more days past due $ 57,600   19,100  
Receivable, 30-89 days past due 59,600   11,400  
Financing receivable, nonaccrual status, current 28,600   32,000  
Other Commercial | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual loans and leases 13,390   10,972  
Loans held for investment, net 2,245,910   2,129,860  
Venture Capital Loans | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual loans and leases 0   325  
Loans held for investment, net 1,513,641   1,446,362  
Asset Based [Member] | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual loans and leases 2,325   2,689  
Loans held for investment, net $ 2,061,016   $ 2,189,085