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Business Combinations - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 01, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Aug. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Business Combination [Line Items]                
Common stock, par value (in dollars per share)   $ 0.01   $ 0.01     $ 0.01  
Goodwill   $ 353,471   $ 353,471     $ 241,222 $ 241,222
Non-PCD loans acquired $ 8,520,000              
Acquisition-related cost   45,863 $ 0 47,273 $ 823      
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              
Voting equity interest acquired, percentage 45.00%         100.00%    
Goodwill $ 112,248              
Allowance for credit losses, non-PCD loans $ 67,200              
Acquisition-related cost   $ 45,900   $ 47,300