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Allowance for Credit Losses - Schedule of Changes in the Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 01, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Changes in allowance for loan losses
Balance at the beginning of the period		$ 126,725	$ 121,750	$ 125,083	$ 117,522	$ 117,522
Charge-offs		(16,662)	(4,183)	(31,334)	(18,396)
Recoveries		805	375	2,754	1,120
Merger Day 1 CECL provision		69,487	0	69,487	0
Provision (credit) for loan and lease losses excluding unfunded commitments		8,869	9,374	23,234	27,070
Provision (credit) for PCD loan and lease losses excluding unfunded commitments	$ 64,510	64,511		64,511
Balance at the end of the period		253,735	127,316	253,735	127,316	125,083
Charge-offs for Merger Day 1 purchase accounting		15,800		15,800
Commercial Real Estate
Changes in allowance for loan losses
Balance at the beginning of the period		73,115	82,152	74,171	81,410	81,410
Charge-offs		(926)	0	(4,449)	(4,425)
Recoveries		107	0	107	0
Merger Day 1 CECL provision		31,820	0	31,820	0
Provision (credit) for loan and lease losses excluding unfunded commitments		5,040	(6,971)	7,507	(1,804)
Provision (credit) for PCD loan and lease losses excluding unfunded commitments		38,744		38,744
Balance at the end of the period		147,900	75,181	147,900	75,181	74,171
Commercial
Changes in allowance for loan losses
Balance at the beginning of the period		46,469	33,386	44,169	29,557	29,557
Charge-offs		(15,694)	(4,164)	(26,830)	(13,933)
Recoveries		578	367	2,427	1,086
Merger Day 1 CECL provision		17,891	0	17,891	0
Provision (credit) for loan and lease losses excluding unfunded commitments		6,637	16,632	18,224	29,511
Provision (credit) for PCD loan and lease losses excluding unfunded commitments		24,294		24,294
Balance at the end of the period		80,175	46,221	80,175	46,221	44,169
Consumer
Changes in allowance for loan losses
Balance at the beginning of the period		7,141	6,212	6,743	6,555	6,555
Charge-offs		(42)	(19)	(55)	(38)
Recoveries		120	8	220	34
Merger Day 1 CECL provision		19,776	0	19,776	0
Provision (credit) for loan and lease losses excluding unfunded commitments		(2,808)	(287)	(2,497)	(637)
Provision (credit) for PCD loan and lease losses excluding unfunded commitments		1,473		1,473
Balance at the end of the period		$ 25,660	$ 5,914	$ 25,660	$ 5,914	$ 6,743

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- Definition

Financing Receivable, Excluding Accrued Interest, Allowance For Credit Loss, Writeoff, Merger Day One Purchase Accounting

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Financing Receivable, Excluding Accrued Interest, Merger Day One CECL Provision

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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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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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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 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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-Paragraph 6
-Publisher FASB
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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
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Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease.

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-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Subparagraph (c)
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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