Loans and Leases (Details 2) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	$ 61,174	$ 91,163
Loans held for investment, net	22,941,548	19,083,377
Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	39,832	45,557
Loans held for investment, net	11,178,720	7,899,936
Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	4,715	315
Loans held for investment, net	3,437,127	3,360,281
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	16,213	44,902
Loans held for investment, net	7,868,051	7,502,905
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	414	389
Loans held for investment, net	457,650	320,255
Performing Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	22,880,374	18,992,214
Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	11,138,888	7,854,379
Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	3,432,412	3,359,966
Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	7,851,838	7,458,003
Performing Financing Receivable [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	457,236	319,866
Asset Based [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	1,464	2,679
Loans held for investment, net	4,075,477	3,429,283
Asset Based [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	4,074,013	3,426,604
Venture Capital Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	2,799	1,980
Loans held for investment, net	2,320,593	1,698,508
Venture Capital Loans [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,317,794	1,696,528
Other Commercial [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	11,950	40,243
Loans held for investment, net	1,471,981	2,375,114
Other Commercial [Member] | Performing Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	1,460,031	2,334,871
Commercial Real Estate Construction Loan Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	0	315
Loans held for investment, net	832,591	1,117,121
Commercial Real Estate Construction Loan Receivable [Member] | Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	832,591	1,116,806
Residential Real Estate Construction Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	4,715	0
Loans held for investment, net	2,604,536	2,243,160
Residential Real Estate Construction Financing Receivable [Member] | Performing Financing Receivable [Member] | Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	2,599,821	2,243,160
Commercial Real Estate [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	27,540	43,731
Loans held for investment, net	3,762,299	4,096,671
Commercial Real Estate [Member] | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	3,734,759	4,052,940
Residential Real Estate [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	12,292	1,826
Loans held for investment, net	7,416,421	3,803,265
Residential Real Estate [Member] | Performing Financing Receivable [Member] | Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Loans held for investment, net	$ 7,404,129	$ 3,801,439