Allowance for Credit Losses - Activity in ACL by Class of Loans and Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	$ 143,900	$ 157,262	$ 208,454
Charge-offs	(23,506)	(20,888)	(23,623)
Recoveries	11,279	9,647	11,150
Provision	24,860	(2,121)	(38,719)
Balance at end of year	156,533	143,900	157,262
Commercial Lending
Rollforward of the Allowance for Credit Losses
Charge-offs	(5,982)
Commercial and Industrial
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	14,564	20,080	24,711
Charge-offs	(3,482)	(2,012)	(5,949)
Recoveries	3,346	897	867
Provision	528	(4,401)	451
Balance at end of year	14,956	14,564	20,080
Commercial Real Estate
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	43,810	42,951	58,123
Charge-offs	(2,500)	(750)	(66)
Recoveries		14	39
Provision	2,634	1,595	(15,145)
Balance at end of year	43,944	43,810	42,951
Construction
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	5,843	9,773	10,039
Charge-offs	0
Recoveries			266
Provision	4,549	(3,930)	(532)
Balance at end of year	10,392	5,843	9,773
Lease financing
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	1,551	1,659	3,298
Charge-offs	0
Recoveries		60
Provision	203	(168)	(1,639)
Balance at end of year	1,754	1,551	1,659
Residential mortgage
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	35,175	34,364	40,461
Charge-offs	(414)	(103)	(632)
Recoveries	141	418	261
Provision	1,686	496	(5,726)
Balance at end of year	36,880	35,175	34,364
Residential mortgage | Residential Lending: Residential Mortgage
Rollforward of the Allowance for Credit Losses
Charge-offs	(122)
Residential mortgage | Residential Lending: Home Equity Line
Rollforward of the Allowance for Credit Losses
Charge-offs	(292)
Residential Lending: Home Equity Line
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	8,296	5,642	7,163
Charge-offs	(292)	(1,175)	(342)
Recoveries	702	713	117
Provision	3,022	3,116	(1,296)
Balance at end of year	11,728	8,296	5,642
Consumer
Rollforward of the Allowance for Credit Losses
Balance at beginning of year	34,661	42,793	64,659
Charge-offs	(17,110)	(16,848)	(16,634)
Recoveries	7,090	7,545	9,600
Provision	12,238	1,171	(14,832)
Balance at end of year	$ 36,879	$ 34,661	$ 42,793