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Loans and Leases - Aging Analysis of Loans and Leases Held for Investment (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net $ 24,352,072 $ 22,941,548 $ 18,979,228
Financing Receivable Recorded Investment Total Past Due 81,110 73,508  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 24,270,962 22,868,040  
30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 63,055 55,042  
90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 18,055 18,466  
Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 12,039,291 11,178,720 7,987,213
Financing Receivable Recorded Investment Total Past Due 51,350 57,714  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 11,987,941 11,121,006  
Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 40,480 45,812  
Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 10,870 11,902  
Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,693,489 3,437,127 3,565,823
Financing Receivable Recorded Investment Total Past Due 27,231 9,494  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,666,258 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 21,413 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 5,818 2,223  
Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 8,114,695 7,868,051 7,085,840
Financing Receivable Recorded Investment Total Past Due 1,165 5,020  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 8,113,530 7,863,031  
Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 167 955  
Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 998 4,065  
Consumer      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 504,597 457,650 $ 340,352
Financing Receivable Recorded Investment Total Past Due 1,364 1,280  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 503,233 456,370  
Consumer | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 995 1,004  
Consumer | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 369 276  
Asset-based | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 4,739,220 4,075,477  
Financing Receivable Recorded Investment Total Past Due 449 464  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 4,738,771 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 449 464  
Venture Capital Loans | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 2,077,339 2,320,593  
Financing Receivable Recorded Investment Total Past Due 0 0  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 2,077,339 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 1,298,136 1,471,981  
Financing Receivable Recorded Investment Total Past Due 716 4,556  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 1,297,420 1,467,425  
Other Commercial | Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 167 955  
Other Commercial | Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 549 3,601  
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 802,022 832,591  
Financing Receivable Recorded Investment Total Past Due 0 0  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 802,022 832,591  
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 2,891,467 2,604,536  
Financing Receivable Recorded Investment Total Past Due 27,231 9,494  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 2,864,236 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 21,413 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 5,818 2,223  
Commercial | Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,669,741 3,762,299  
Financing Receivable Recorded Investment Total Past Due 6,100 7,543  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,663,641 3,754,756  
Commercial | Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 3,777 5,307  
Commercial | Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 2,323 2,236  
Residential Real Estate [Member] | Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 8,369,550 7,416,421  
Financing Receivable Recorded Investment Total Past Due 45,250 50,171  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 8,324,300 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 36,703 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 $ 8,547 $ 9,666