Business Combinations - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Sep. 01, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Aug. 31, 2025
Business Combination [Line Items]
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Goodwill		$ 351,613	$ 241,222	$ 241,222
Acquisition-related cost		61,697	$ 4,201	$ 7,411
Core deposits
Business Combination [Line Items]
Intangible asset, useful life	12 years
Customer relationships intangible asset
Business Combination [Line Items]
Intangible asset, useful life	12 years
Brookline Bancorp, Inc.
Business Combination [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Holdco Merger
Business Combination [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Equity shares issued per acquiree share (in shares)	0.42
Share issued (in shares)	37,700,000
Percentage Ownership	45.00%				100.00%
Goodwill	$ 110,391
Acquisition-related cost		$ 61,700