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Summary of Significant Accounting Policies (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2002
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Property, Plant and Equipment [Line Items]          
Cash and cash equivalents maturity period (in days)   90 days      
Provision charge for credit losses on loans   $ 83,604 $ 27,900 $ 8,400  
Financing receivable, coverage ratio (as a percent)   0.0104      
Allowance for credit losses   $ 193,432 $ 107,200 $ 88,023 $ 80,740
Sensitivity analysis of financing receivable, allowance for credit loss, impact of adverse change in assumption, amount   $ 16,000      
Sensitivity analysis of financing receivable, allowance for credit loss, impact of adverse change in assumption (as a percent)   0.0112      
Dividends paid on unallocated ESOP shares over period (in years)   30 years      
Shares held by the DDFP (in shares) | shares   0      
Bank eliminated post-retirement healthcare benefits for employees with less than (in years) 10 years        
401(k) Plan          
Property, Plant and Equipment [Line Items]          
Percentage of matching contribution (as a percent)   25.00% 25.00% 25.00%  
Percentage of participants matched contribution (as a percent)   6.00%      
Depositor Relationships          
Property, Plant and Equipment [Line Items]          
Amortized accelerated basis period (in years)   8 years 9 months 18 days      
Estimated useful life of core deposits (in years)   10 years      
Lakeland Bancorp, Inc. - Merger Agreement          
Property, Plant and Equipment [Line Items]          
Allowance for credit losses   $ 60,100      
Beacon Trust | Customer Relationships          
Property, Plant and Equipment [Line Items]          
Amortized accelerated basis period (in years)   12 years      
The MDE Group, Inc. | Customer Relationships          
Property, Plant and Equipment [Line Items]          
Amortized accelerated basis period (in years)   10 years 4 months 24 days      
Tirschwell & Loewy, Inc. | Customer Relationships          
Property, Plant and Equipment [Line Items]          
Amortized accelerated basis period (in years)   10 years      
SB One Bank | Customer Relationships          
Property, Plant and Equipment [Line Items]          
Amortized accelerated basis period (in years)   13 years