Loans and Allowance for Credit Losses for Loans - Summary of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Allowance for loan losses:
Beginning balance	$ 578,200	$ 469,248	$ 558,850	$ 446,080	$ 446,080
Loans charged-off	(42,071)	(38,339)	(86,090)	(63,239)
Charged-off loans recovered	4,242	1,500	6,312	2,845
Net charge-offs	(37,829)	(36,839)	(79,778)	(60,394)
Provision (credit) for loan losses	39,129	86,901	100,428	133,624
Ending balance	579,500	519,310	579,500	519,310	558,850
Commercial and industrial
Allowance for loan losses:
Beginning balance	184,700	138,593	173,002	133,359	133,359
Loans charged-off	(25,189)	(14,721)	(53,645)	(29,014)
Charged-off loans recovered	2,789	742	3,599	1,424
Net charge-offs	(22,400)	(13,979)	(50,046)	(27,590)
Provision (credit) for loan losses	11,115	24,629	50,459	43,474
Ending balance	173,415	149,243	173,415	149,243	173,002
Commercial Real Estate
Allowance for loan losses:
Beginning balance	321,662	265,847	304,148	249,598	249,598
Loans charged-off	(14,623)	(22,356)	(28,046)	(31,154)
Charged-off loans recovered	643	150	892	391
Net charge-offs	(13,980)	(22,206)	(27,154)	(30,763)
Provision (credit) for loan losses	27,297	57,452	57,985	82,258
Ending balance	334,979	301,093	334,979	301,093	304,148
Residential Mortgage
Allowance for loan losses:
Beginning balance	48,906	44,377	58,895	42,957	42,957
Loans charged-off	(46)	0	(46)	0
Charged-off loans recovered	37	5	205	30
Net charge-offs	(9)	5	159	30
Provision (credit) for loan losses	(67)	3,315	(10,224)	4,710
Ending balance	48,830	47,697	48,830	47,697	58,895
Consumer loans
Allowance for loan losses:
Beginning balance	22,932	20,431	22,805	20,166	20,166
Loans charged-off	(2,213)	(1,262)	(4,353)	(3,071)
Charged-off loans recovered	773	603	1,616	1,000
Net charge-offs	(1,440)	(659)	(2,737)	(2,071)
Provision (credit) for loan losses	784	1,505	2,208	3,182
Ending balance	$ 22,276	$ 21,277	$ 22,276	$ 21,277	$ 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 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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+ 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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
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-Publisher FASB
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