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Premises and Equipment - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
holding
Jun. 30, 2024
USD ($)
Property, Plant and Equipment [Line Items]            
Depreciation and amortization     $ 35,400 $ 34,700 $ 41,700  
Gain (loss) on disposal of property and equipment   $ (700) (1,700) (4,600) (6,300)  
Proceeds from sale of property and equipment     6,769 6,894 $ 300  
Premises and equipment, net     406,963 429,561    
Number of locations closed | holding         14  
Reduction in real estate         45.00%  
Cash proceeds from sale of business   $ 4,100        
Manchester Property            
Property, Plant and Equipment [Line Items]            
Gain (loss) on disposal of property and equipment     900      
Proceeds from sale of property and equipment     1,600      
Premises and equipment, net           $ 700
Yonkers Property            
Property, Plant and Equipment [Line Items]            
Transfers from (to) property and equipment $ 800          
Write-downs 400          
Proceeds from sale of property and equipment 700          
Costs to sell $ 100          
New Britain, Connecticut Facility            
Property, Plant and Equipment [Line Items]            
Write-down of real estate         $ 1,800  
Assets held for disposition         $ 4,800  
Disposal Group, Held-for-Sale, Not Discontinued Operations            
Property, Plant and Equipment [Line Items]            
Gain (loss) on disposal of property and equipment     400 1,100    
Carrying amount of assets held for disposition     5,100 3,700    
Transfers from (to) property and equipment     5,600 5,100    
Write-downs     300 100    
Proceeds from sale of property and equipment     $ 4,400 $ 2,700