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Loans and Allowance for Loan Losses - Schedule of Rollforward of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Allowance for loan losses:
Beginning balance	$ 485,101	$ 471,238	$ 479,385	$ 443,424	$ 443,424
Charge-offs	(34,106)	(73,935)	(126,965)	(135,526)	(183,074)
Recoveries	7,054	7,113	21,072	23,758
Provision for (reversal of) loan losses	26,936	73,116	111,493	145,876
Ending balance	484,985	477,532	484,985	477,532	479,385
Commercial & Industrial
Allowance for loan losses:
Beginning balance	220,730	159,987	218,970	161,550	161,550
Charge-offs	(21,484)	(40,483)	(93,806)	(71,197)
Recoveries	5,094	3,842	12,971	13,720
Provision for (reversal of) loan losses	(4,272)	56,322	61,933	75,595
Ending balance	200,068	179,668	200,068	179,668	218,970
Commercial Real Estate
Allowance for loan losses:
Beginning balance	141,680	169,726	133,758	143,575	143,575
Charge-offs	(5,833)	(23,364)	(9,807)	(23,465)
Recoveries	333	310	1,562	972
Provision for (reversal of) loan losses	7,408	16,490	18,075	42,080
Ending balance	143,588	163,162	143,588	163,162	133,758
Total consumer
Allowance for loan losses:
Beginning balance	122,691	141,525	126,657	138,299	138,299
Charge-offs	(6,789)	(10,088)	(23,352)	(40,864)
Recoveries	1,627	2,961	6,539	9,066
Provision for (reversal of) loan losses	23,800	304	31,485	28,201
Ending balance	$ 141,329	$ 134,702	$ 141,329	$ 134,702	$ 126,657

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
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-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

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