Revenues Revenue Recognition by Segment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		$ 201,953	$ 212,278	$ 246,077
Noninterest Income, Outside of Scope of Topic 606		80,417	120,086	267,979
Total noninterest income		282,370	332,364	514,056
Wealth management fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606	[1]	84,122	89,854	84,957
Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		62,310	64,406	56,307
Card-based fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		44,132	43,124	38,605
Other fee-based revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		11,389	14,894	66,208
Corporate and Commercial Specialty [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		101,873	110,340	102,783
Noninterest Income, Outside of Scope of Topic 606		43,878	55,004	41,491
Corporate and Commercial Specialty [Member] | Wealth management fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		84,122	89,854	83,570
Corporate and Commercial Specialty [Member] | Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		13,240	15,880	14,639
Corporate and Commercial Specialty [Member] | Card-based fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		1,547	1,397	1,098
Corporate and Commercial Specialty [Member] | Other fee-based revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		2,964	3,208	3,476
Community, Consumer and Business [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		98,572	100,942	144,558
Noninterest Income, Outside of Scope of Topic 606		20,276	50,532	46,249
Community, Consumer and Business [Member] | Wealth management fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		0	0	1,387
Community, Consumer and Business [Member] | Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		49,052	48,493	41,637
Community, Consumer and Business [Member] | Card-based fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		42,474	41,730	37,259
Community, Consumer and Business [Member] | Other fee-based revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		7,046	10,719	64,274
Risk Management and Shared Services [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		1,508	996	(1,264)
Noninterest Income, Outside of Scope of Topic 606		16,263	14,550	180,238
Risk Management and Shared Services [Member] | Service charges and deposit account fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		18	32	31
Risk Management and Shared Services [Member] | Card-based fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		111	(3)	247
Risk Management and Shared Services [Member] | Other fee-based revenue
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Noninterest Income In Scope of Topic 606		1,379	967	(1,542)
Risk Management and Shared Serivies [Member] | ABRC [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Gain (Loss) on Disposition of Assets for Financial Service Operations				163,000
Operating Segments [Member] | Corporate and Commercial Specialty [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Total noninterest income		145,751	165,345	144,274
Operating Segments [Member] | Community, Consumer and Business [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Total noninterest income		118,848	151,474	190,808
Operating Segments [Member] | Risk Management and Shared Services [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Total noninterest income		$ 17,772	$ 15,546	$ 178,974

[1] (a)