v3.26.1
Proposed Second-Step Conversion and Acquisition of Northfield Bancorp, Inc. - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2026
Mar. 31, 2026
Dec. 31, 2025
Business Combination [Line Items]      
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01
Forecast | Northfield      
Business Combination [Line Items]      
Common stock, par value (in dollars per share) $ 0.01    
Business combination, conversion value, decrease from midpoint, trigger for conversion delay 0.20    
Business combination, contingent termination fee payable $ 23.7    
Business combination, contingent termination fee payable, additional amount 6.0    
Forecast | Northfield | Tranche One      
Business Combination [Line Items]      
Business combination, independent valuation amount $ 2,300.0    
Business combination, consideration transferred, equity interests issued and issuable, entity shares issued per acquiree share (in shares) 1,425,000    
Business combination, consideration transferred, equity interests issued and issuable, cash paid per acquiree share (in dollars per share) $ 14.25    
Forecast | Northfield | Tranche Two      
Business Combination [Line Items]      
Business combination, consideration transferred, equity interests issued and issuable, entity shares issued per acquiree share (in shares) 1,450,000    
Business combination, consideration transferred, equity interests issued and issuable, cash paid per acquiree share (in dollars per share) $ 14.50    
Forecast | Northfield | Tranche Two | Greater Than Independent Valuation      
Business Combination [Line Items]      
Business combination, independent valuation amount $ 2,300.0    
Forecast | Northfield | Tranche Two | Less Than Independent Valuation      
Business Combination [Line Items]      
Business combination, independent valuation amount $ 2,600.0    
Forecast | Northfield | Tranche Three      
Business Combination [Line Items]      
Business combination, consideration transferred, equity interests issued and issuable, entity shares issued per acquiree share (in shares) 1,465,000    
Business combination, consideration transferred, equity interests issued and issuable, cash paid per acquiree share (in dollars per share) $ 14.65    
Forecast | Northfield | Tranche Three | Greater Than Independent Valuation      
Business Combination [Line Items]      
Business combination, independent valuation amount $ 2,600.0    
Forecast | MHC | Northfield      
Business Combination [Line Items]      
Business combination, voting equity interest acquired, percentage 73.00%    
Forecast | Holding Company Common Stock | Northfield      
Business Combination [Line Items]      
Common stock, par value (in dollars per share) $ 0.01    
Forecast | Company Common Stock | Northfield      
Business Combination [Line Items]      
Common stock, par value (in dollars per share) $ 0.01    
Forecast | Northfield Common Stock | Northfield      
Business Combination [Line Items]      
Business combination, voting equity interest acquired, percentage 30.00%