Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 28,336,244	$ 13,601,846
Allowance for credit losses	(280,507)	(107,341)	$ (114,037)	$ (131,388)
Net loans	28,055,737	13,494,505
Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	28,336,244	13,601,846
Allowance for credit losses	(280,507)	(107,341)
Net loans	28,055,737	13,494,505
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	8,624,253	3,391,769
Allowance for credit losses	(99,471)	(27,232)	(25,130)	(30,567)
Commercial | PPP Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	205,300	169,000
Commercial | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	(189,580)	(191,557)
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	8,434,673	3,200,212
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	11,337,735	6,380,674
Allowance for credit losses	(140,490)	(64,004)	(70,561)	(75,810)
Commercial real estate | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	(154,733)	(159,190)
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	11,183,002	6,221,484
BBCC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses	(2,069)	(2,458)	(2,537)	(6,120)
BBCC | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	344,313	350,747
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	344,313	350,747
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,706,155	2,255,289
Allowance for credit losses	(17,252)	(9,347)	(10,265)	(12,608)
Residential real estate | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0	0
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,706,155	2,255,289
Consumer credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,668,101	1,574,114
Consumer credit | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	(2,668,101)	(1,574,114)
Indirect
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	906,526	873,139
Allowance for credit losses	(1,648)	(1,743)	(2,255)	(3,580)
Indirect | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	906,526	873,139
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	906,526	873,139
Direct
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	680,690	140,385
Allowance for credit losses	(14,450)	(528)	(665)	(855)
Direct | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	680,690	140,385
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	680,690	140,385
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,080,885	560,590
Allowance for credit losses	(5,127)	(2,029)	$ (2,624)	$ (1,848)
Home equity | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,080,885	560,590
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,080,885	560,590
Direct Finance Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 71,100	$ 25,100