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Loans and Leases - Aging Analysis of Loans and Leases Held for Investment (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net $ 27,660,041 $ 22,941,548 $ 20,511,020
Financing Receivable Recorded Investment Total Past Due 67,654 73,508  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 27,592,387 22,868,040  
30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 29,533 55,042  
90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 38,121 18,466  
Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 14,630,749 11,178,720 9,580,957
Financing Receivable Recorded Investment Total Past Due 50,385 57,714  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 14,580,364 11,121,006  
Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 24,034 45,812  
Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 26,351 11,902  
Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 4,293,516 3,437,127 3,651,873
Financing Receivable Recorded Investment Total Past Due 10,071 9,494  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 4,283,445 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 3,051 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 7,020 2,223  
Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 8,271,182 7,868,051 6,872,222
Financing Receivable Recorded Investment Total Past Due 4,852 5,020  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 8,266,330 7,863,031  
Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 452 955  
Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 4,400 4,065  
Consumer      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 464,594 457,650 $ 405,968
Financing Receivable Recorded Investment Total Past Due 2,346 1,280  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 462,248 456,370  
Consumer | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 1,996 1,004  
Consumer | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 350 276  
Asset-based | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 5,154,654 4,075,477  
Financing Receivable Recorded Investment Total Past Due 437 464  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 5,154,217 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 437 464  
Venture Capital Loans | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 2,001,086 2,320,593  
Financing Receivable Recorded Investment Total Past Due 0 0  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 2,001,086 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 1,115,442 1,471,981  
Financing Receivable Recorded Investment Total Past Due 4,415 4,556  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 1,111,027 1,467,425  
Other Commercial | Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 452 955  
Other Commercial | Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 3,963 3,601  
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 843,086 832,591  
Financing Receivable Recorded Investment Total Past Due 0 0  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 843,086 832,591  
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 3,450,430 2,604,536  
Financing Receivable Recorded Investment Total Past Due 10,071 9,494  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,440,359 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 3,051 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 7,020 2,223  
Commercial | Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,770,706 3,762,299  
Financing Receivable Recorded Investment Total Past Due 14,465 7,543  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,756,241 3,754,756  
Commercial | Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 381 5,307  
Commercial | Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 14,084 2,236  
Residential Real Estate [Member] | Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 10,860,043 7,416,421  
Financing Receivable Recorded Investment Total Past Due 35,920 50,171  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 10,824,123 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 23,653 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 $ 12,267 $ 9,666