Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 30,528,933		$ 13,601,846
Allowance for credit losses	(302,254)	$ (288,003)	(107,341)	$ (107,868)	$ (109,444)	$ (131,388)
Net loans	30,226,679		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	30,528,933		13,601,846
Allowance for credit losses	(302,254)		(107,341)
Net loans	30,226,679		13,494,505
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	9,311,148		3,391,769
Allowance for credit losses	(112,413)	(102,819)	(27,232)	(26,160)	(25,731)	(30,567)
Commercial | PPP Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	43,500		169,000
Commercial | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	(197,169)		(191,557)
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	9,113,979		3,200,212
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	12,227,888		6,380,674
Allowance for credit losses	(144,090)	(141,802)	(64,004)	(65,097)	(65,469)	(75,810)
Commercial real estate | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	(153,784)		(159,190)
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	12,074,104		6,221,484
BBCC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses	(2,168)	(2,064)	(2,458)	(2,562)	(2,798)	(6,120)
BBCC | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	350,953		350,747
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	350,953		350,747
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,267,306		2,255,289
Allowance for credit losses	(21,256)	(19,729)	(9,347)	(9,526)	(10,419)	(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	6,267,306		2,255,289
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,722,591		1,574,114
Consumer | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	(2,722,591)		(1,574,114)
Indirect
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,004,054		873,139
Allowance for credit losses	(1,585)	(1,641)	(1,743)	(1,861)	(2,043)	(3,580)
Indirect | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,004,054		873,139
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,004,054		873,139
Direct
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	674,943		140,385
Allowance for credit losses	(16,096)	(14,412)	(528)	(586)	(640)	(855)
Direct | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	674,943		140,385
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	674,943		140,385
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,043,594		560,590
Allowance for credit losses	(4,646)	$ (5,536)	(2,029)	$ (2,076)	$ (2,344)	$ (1,848)
Home equity | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,043,594		560,590
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,043,594		560,590
Direct Finance Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 196,700		$ 25,100