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Loans and Leases - Aging Analysis of Loans and Leases Held for Investment (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net $ 19,506,257 $ 19,083,377 $ 19,694,631
Financing Receivable Recorded Investment Total Past Due 40,804 48,755  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 19,465,453 19,034,622  
30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 27,112 12,232  
90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 13,692 36,523  
Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 8,413,020 7,899,936 7,955,734
Financing Receivable Recorded Investment Total Past Due 10,536 36,868  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 8,402,484 7,863,068  
Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 2,624 7,350  
Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 7,912 29,518  
Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,505,584 3,360,281 3,340,528
Financing Receivable Recorded Investment Total Past Due 24,648 759  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,480,936 3,359,522  
Real Estate Construction and Land | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 22,714 759  
Real Estate Construction and Land | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 1,934 0  
Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 7,222,244 7,502,905 7,987,050
Financing Receivable Recorded Investment Total Past Due 3,879 9,757  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 7,218,365 7,493,148  
Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 320 2,863  
Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 3,559 6,894  
Consumer      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 365,409 320,255 $ 411,319
Financing Receivable Recorded Investment Total Past Due 1,741 1,371  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 363,668 318,884  
Consumer | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 1,454 1,260  
Consumer | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 287 111  
Asset-based | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,550,903 3,429,283  
Financing Receivable Recorded Investment Total Past Due 1,484 2,128  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,549,419 3,427,155  
Asset-based | Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 0 0  
Asset-based | Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 1,484 2,128  
Venture Capital Loans | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 1,749,432 1,698,508  
Financing Receivable Recorded Investment Total Past Due 335 540  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 1,749,097 1,697,968  
Venture Capital Loans | Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 0 540  
Venture Capital Loans | Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 335 0  
Other Commercial | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 1,921,909 2,375,114  
Financing Receivable Recorded Investment Total Past Due 2,060 7,089  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 1,919,849 2,368,025  
Other Commercial | Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 320 2,323  
Other Commercial | Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 1,740 4,766  
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 930,785 1,117,121  
Financing Receivable Recorded Investment Total Past Due 0 0  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 930,785 1,117,121  
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 0 0  
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 0 0  
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 2,574,799 2,243,160  
Financing Receivable Recorded Investment Total Past Due 24,648 759  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 2,550,151 2,242,401  
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 22,714 759  
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 1,934 0  
Commercial | Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,792,198 4,096,671  
Financing Receivable Recorded Investment Total Past Due 3,400 35,895  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,788,798 4,060,776  
Commercial | Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 445 6,750  
Commercial | Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 2,955 29,145  
Residential Real Estate [Member] | Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 4,620,822 3,803,265  
Financing Receivable Recorded Investment Total Past Due 7,136 973  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 4,613,686 3,802,292  
Residential Real Estate [Member] | Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 2,179 600  
Residential Real Estate [Member] | Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due $ 4,957 $ 373