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Loans and Leases - Aging Analysis of Loans and Leases Held for Investment (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net $ 26,501,137 $ 22,941,548 $ 19,506,257
Financing Receivable Recorded Investment Total Past Due 104,648 73,508  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 26,396,489 22,868,040  
30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 66,581 55,042  
90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 38,067 18,466  
Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 13,549,646 11,178,720 8,413,020
Financing Receivable Recorded Investment Total Past Due 52,076 57,714  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 13,497,570 11,121,006  
Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 27,770 45,812  
Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 24,306 11,902  
Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,991,039 3,437,127 3,505,584
Financing Receivable Recorded Investment Total Past Due 38,765 9,494  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,952,274 3,427,633  
Real Estate Construction and Land | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 26,288 7,271  
Real Estate Construction and Land | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 12,477 2,223  
Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 8,476,806 7,868,051 7,222,244
Financing Receivable Recorded Investment Total Past Due 11,891 5,020  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 8,464,915 7,863,031  
Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 10,812 955  
Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 1,079 4,065  
Consumer      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 483,646 457,650 $ 365,409
Financing Receivable Recorded Investment Total Past Due 1,916 1,280  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 481,730 456,370  
Consumer | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 1,711 1,004  
Consumer | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 205 276  
Asset-based | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 5,068,112 4,075,477  
Financing Receivable Recorded Investment Total Past Due 441 464  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 5,067,671 4,075,013  
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 441 464  
Venture Capital Loans | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 2,179,190 2,320,593  
Financing Receivable Recorded Investment Total Past Due 0 0  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 2,179,190 2,320,593  
Venture Capital Loans | Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 0 0  
Venture Capital Loans | Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 0 0  
Other Commercial | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 1,229,504 1,471,981  
Financing Receivable Recorded Investment Total Past Due 11,450 4,556  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 1,218,054 1,467,425  
Other Commercial | Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 10,812 955  
Other Commercial | Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 638 3,601  
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 837,423 832,591  
Financing Receivable Recorded Investment Total Past Due 0 0  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 837,423 832,591  
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 3,153,616 2,604,536  
Financing Receivable Recorded Investment Total Past Due 38,765 9,494  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,114,851 2,595,042  
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 26,288 7,271  
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 12,477 2,223  
Commercial | Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,670,515 3,762,299  
Financing Receivable Recorded Investment Total Past Due 15,204 7,543  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,655,311 3,754,756  
Commercial | Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 13,345 5,307  
Commercial | Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 1,859 2,236  
Residential Real Estate [Member] | Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 9,879,131 7,416,421  
Financing Receivable Recorded Investment Total Past Due 36,872 50,171  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 9,842,259 7,366,250  
Residential Real Estate [Member] | Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 14,425 40,505  
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 $ 22,447 $ 9,666