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Loans and Leases - Aging Analysis of Loans and Leases Held for Investment (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net $ 20,511,020 $ 19,083,377 $ 19,026,200
Financing Receivable Recorded Investment Total Past Due 51,641 48,755  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 20,459,379 19,034,622  
30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 20,949 12,232  
90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 30,692 36,523  
Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 9,580,957 7,899,936 7,877,045
Financing Receivable Recorded Investment Total Past Due 13,274 36,868  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 9,567,683 7,863,068  
Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 4,659 7,350  
Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 8,615 29,518  
Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,651,873 3,360,281 3,423,747
Financing Receivable Recorded Investment Total Past Due 32,604 759  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,619,269 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 13,017 759  
Real Estate Construction and Land | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 19,587 0  
Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 6,872,222 7,502,905 7,363,174
Financing Receivable Recorded Investment Total Past Due 4,364 9,757  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 6,867,858 7,493,148  
Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 2,231 2,863  
Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 2,133 6,894  
Consumer      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 405,968 320,255 $ 362,234
Financing Receivable Recorded Investment Total Past Due 1,399 1,371  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 404,569 318,884  
Consumer | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 1,042 1,260  
Consumer | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 357 111  
Asset-based | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,661,769 3,429,283  
Financing Receivable Recorded Investment Total Past Due 479 2,128  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,661,290 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 479 2,128  
Venture Capital Loans | Commercial      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 1,632,861 1,698,508  
Financing Receivable Recorded Investment Total Past Due 1,670 540  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 1,631,191 1,697,968  
Venture Capital Loans | Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 1,670 540  
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 1,577,592 2,375,114  
Financing Receivable Recorded Investment Total Past Due 2,215 7,089  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 1,575,377 2,368,025  
Other Commercial | Commercial | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 561 2,323  
Other Commercial | Commercial | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 1,654 4,766  
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 992,003 1,117,121  
Financing Receivable Recorded Investment Total Past Due 0 0  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 992,003 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 2,659,870 2,243,160  
Financing Receivable Recorded Investment Total Past Due 32,604 759  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 2,627,266 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 13,017 759  
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 19,587 0  
Commercial | Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 3,694,597 4,096,671  
Financing Receivable Recorded Investment Total Past Due 3,853 35,895  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 3,690,744 4,060,776  
Commercial | Real Estate Mortgage | 30 TO 89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
30-89 Days Past Due 899 6,750  
Commercial | Real Estate Mortgage | 90 Or More Days Past Due      
Financing Receivable, Past Due [Line Items]      
90 or More Days Past Due 2,954 29,145  
Residential Real Estate [Member] | Real Estate Mortgage      
Financing Receivable, Past Due [Line Items]      
Loans held for investment, net 5,886,360 3,803,265  
Financing Receivable Recorded Investment Total Past Due 9,421 973  
Loans And Leases Receivable Net Of Deferred Income, Not Past Due 5,876,939 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 3,760 600  
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 $ 5,661 $ 373