Loans and Allowance for Credit Losses for Loans - Summary of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Allowance for loan losses:
Beginning balance	$ 558,850	$ 446,080	$ 446,080
Loans charged-off	(44,019)	(24,900)
Charged-off loans recovered	2,070	1,345
Net (charge-offs) recoveries	(41,949)	(23,555)
Provision (credit) for loan losses	61,299	46,723
Ending balance	578,200	469,248	558,850
Commercial and industrial
Allowance for loan losses:
Beginning balance	173,002	133,359	133,359
Loans charged-off	(28,456)	(14,293)
Charged-off loans recovered	810	682
Net (charge-offs) recoveries	(27,646)	(13,611)
Provision (credit) for loan losses	39,344	18,845
Ending balance	184,700	138,593	173,002
Commercial Real Estate
Allowance for loan losses:
Beginning balance	304,148	249,598	249,598
Loans charged-off	(13,423)	(8,798)
Charged-off loans recovered	249	241
Net (charge-offs) recoveries	(13,174)	(8,557)
Provision (credit) for loan losses	30,688	24,806
Ending balance	321,662	265,847	304,148
Residential Mortgage
Allowance for loan losses:
Beginning balance	58,895	42,957	42,957
Loans charged-off	0	0
Charged-off loans recovered	168	25
Net (charge-offs) recoveries	168	25
Provision (credit) for loan losses	(10,157)	1,395
Ending balance	48,906	44,377	58,895
Consumer loans
Allowance for loan losses:
Beginning balance	22,805	20,166	20,166
Loans charged-off	(2,140)	(1,809)
Charged-off loans recovered	843	397
Net (charge-offs) recoveries	(1,297)	(1,412)
Provision (credit) for loan losses	1,424	1,677
Ending balance	$ 22,932	$ 20,431	$ 22,805

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

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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+ 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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. 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 (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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