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Available for Sale Debt Securities - Narrative (Details)
12 Months Ended
Dec. 31, 2025
USD ($)
numberOfPosition
Dec. 31, 2024
USD ($)
numberOfPosition
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Accrued interest on available for sale debt securities $ 10,900,000 $ 9,700,000  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable Accrued interest receivable  
Securities available for sale at carrying value $ 2,200,000,000 $ 863,900,000  
Debt securities, available for sale, without single maturity date, amortized cost 2,780,000,000    
Debt securities, available for sale, without single maturity date, fair value 2,690,000,000    
Proceeds from sales of securities available for sale 1,670,000 566,942,000 $ 0
Proceeds for gain (loss)   569,900,000  
Gain recognized on sale of securities 87,000 0  
Loss recognized on sale of securities 0 3,000,000  
Proceeds from calls of available for sale securities 23,900,000 780,000  
Gain recognized on proceeds from calls on sale of securities 729,000 0  
Loss recognized on proceeds from calls on sale of securities $ 0 $ 0  
Securities available for sale, number of securities in an unrealized loss position | numberOfPosition 406 646  
Lakeland Bancorp, Inc. - Merger Agreement      
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sale of debt securities, available for sale, gross   $ 2,800,000