Loans Receivable and Allowance for Credit Losses - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands		12 Months Ended
May 16, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		$ 193,432	$ 107,200	$ 88,023
Initial allowance related to PCD loans		0	17,188	0
Provision (benefit) charge for credit losses on loans		4,125	83,604	27,900
Recoveries of loans previously charged off		2,036	3,263	2,292
Loans charged off		(14,826)	(17,823)	(10,421)
Balance at end of period		184,767	193,432	107,200
Lakeland Bancorp, Inc. - Merger Agreement
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		60,100
Initial allowance related to PCD loans	$ 17,188
Balance at end of period		60,100	60,100
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		0	0	(594)
Balance at end of period			0	0
Mortgage Portfolio Segment
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		144,587	73,407
Initial allowance related to PCD loans			10,628
Provision (benefit) charge for credit losses on loans		(11,196)	61,274
Recoveries of loans previously charged off		932	86
Loans charged off		(5,722)	(808)	(1,724)
Balance at end of period		128,601	144,587	73,407
Commercial loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		43,642	31,475
Initial allowance related to PCD loans			6,070
Provision (benefit) charge for credit losses on loans		15,446	20,011
Recoveries of loans previously charged off		527	2,621
Loans charged off		(8,488)	(16,535)	(8,363)
Balance at end of period		51,127	43,642	31,475
Provision charge for credit losses on loans includes benefit to the allowance		2,800
Transfer from the commercial loans loans held for investment portfolio into the loans held for sale portfolio		151,300
Consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		5,203	2,318
Initial allowance related to PCD loans			490
Provision (benefit) charge for credit losses on loans		(125)	2,319
Recoveries of loans previously charged off		577	556
Loans charged off		(616)	(480)
Balance at end of period		$ 5,039	$ 5,203	$ 2,318

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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- 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
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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.

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- Definition

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

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

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- Definition

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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- Definition

Amount, excluding accrued interest, of reversal of credit loss expense on financing receivable transferred out of held-for-investment into held-for-sale classification. Excludes net investment in lease.

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Amount of financing receivable reclassified to held-for-sale.

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