Loans Composition (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 26,494,698	$ 24,224,949
PPP
Loans and Leases Receivable Disclosure [Line Items]
Loans	9,514	66,070
Asset-Based Lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	263,044	178,027
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	8,984,127	8,208,289
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Loans	928,152	971,326
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	10,184,836	9,423,711
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Loans	4,790,241	4,384,569
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,775,648	1,808,976
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Loans	6,565,889	6,193,545
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans	16,750,726	15,617,256
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Loans	8,002,943	7,567,310
Auto
Loans and Leases Receivable Disclosure [Line Items]
Loans	847,969	143,045
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Loans	592,843	595,615
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	300,217	301,723
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 9,743,972	$ 8,607,693