v3.26.1
Borrowings - Narrative (Details)
 6 Months Ended
Sep. 09, 2020
USD ($)
Jun. 30, 2026
USD ($)
business_trust
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]          
Total loans receivable, net   $ 13,079,906,000   $ 12,857,104,000  
Subordinated debt   $ 114,800,000   114,800,000  
Number of statutory business trusts owned | business_trust   7      
Trust Preferred Investments          
Debt Instrument [Line Items]          
Interest paid, net   $ 4,000,000 $ 4,000,000    
Maximum period for which interest payment on the subordinated debentures can be deferred (in years)   5 years      
Interest deferral   $ 0      
Collateralized borrowings, due within one year          
Debt Instrument [Line Items]          
Borrowed funds, short-term   53,000   8,232,000  
Cash and securities collateral   10,000,000      
Subordinated debt          
Debt Instrument [Line Items]          
Debt issued $ 125,000,000        
Stated rate (as a percent) 4.00%        
Interest rate 3.89%        
Repurchase amount         $ 10,000,000
Amount outstanding after repurchase         $ 115,000,000
Debt issuance costs $ 2,000,000        
Debt issuance amortization period (in years) 5 years        
Interest paid, net   4,000,000 $ 2,000,000    
Federal Home Loan Bank of Pittsburgh | Total term notes payable to the FHLB          
Debt Instrument [Line Items]          
Borrowed funds, long-term   65,322,000   105,482,000  
Federal Home Loan Bank of Pittsburgh | Revolving line of credit, FHLB of Pittsburgh | Revolving Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity   250,000,000      
Borrowed funds, short-term   226,700,000   0  
Federal Home Loan Bank of Pittsburgh | Total term notes payable to the FHLB          
Debt Instrument [Line Items]          
Borrowed funds, short-term   320,000,000   $ 332,569,000  
Federal Home Loan Bank of Pittsburgh | Residential First Mortgage and Other Loans          
Debt Instrument [Line Items]          
Total loans receivable, net   $ 6,200,000,000