Loans, Loan Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable [Line Items]
Loans	$ 28,799,569	$ 24,224,949
Commercial Finance and Asset Based Lending
Loans and Leases Receivable [Line Items]
Loans	458,887	178,027
Commercial and industrial
Loans and Leases Receivable [Line Items]
Loans	9,300,567	8,274,358
Commercial real estate - owner occupied
Loans and Leases Receivable [Line Items]
Loans	991,722	971,326
Commercial and business lending
Loans and Leases Receivable [Line Items]
Loans	10,751,176	9,423,711
Commercial real estate - investor
Loans and Leases Receivable [Line Items]
Loans	5,080,344	4,384,569
Real estate construction
Loans and Leases Receivable [Line Items]
Loans	2,155,222	1,808,976
Commercial real estate lending
Loans and Leases Receivable [Line Items]
Loans	7,235,565	6,193,545
Total commercial
Loans and Leases Receivable [Line Items]
Loans	17,986,742	15,617,256
Residential mortgage
Loans and Leases Receivable [Line Items]
Loans	8,511,550	7,567,310
Auto
Loans and Leases Receivable [Line Items]
Loans	1,382,073	143,045
Home equity
Loans and Leases Receivable [Line Items]
Loans	624,353	595,615
Other consumer
Loans and Leases Receivable [Line Items]
Loans	294,851	301,723
Total consumer
Loans and Leases Receivable [Line Items]
Loans	$ 10,812,828	$ 8,607,693