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Borrowed Funds - Narrative (Details)
9 Months Ended
Sep. 09, 2020
USD ($)
Sep. 30, 2023
USD ($)
business_trust
advance
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]      
Total loans receivable, net   $ 11,185,432,000 $ 10,802,416,000
Borrowed funds   604,587,000 681,166,000
Subordinated debt   $ 114,102,000 113,840,000
Number of statutory business trusts owned | business_trust   7  
Trust Preferred Investments      
Debt Instrument [Line Items]      
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   48,587,000 105,766,000
Cash and securities collateral   89,300,000  
Collateral received, due within one year      
Debt Instrument [Line Items]      
Borrowed funds   $ 61,600,000 24,100,000
Subordinated debt      
Debt Instrument [Line Items]      
Debt issued $ 125,000,000    
Stated rate (as a percent) 4.00%    
Repurchase amount     10,200,000
Amount outstanding after repurchase     114,800,000
Debt issuance costs $ 1,800,000    
Debt issuance amortization period (in years) 5 years    
Subordinated debt | SOFR      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent) 3.89%    
Federal Home Loan Bank of Pittsburgh      
Debt Instrument [Line Items]      
Number of advances | advance   10  
Federal Home Loan Bank of Pittsburgh | Revolving line of credit, FHLB of Pittsburgh      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 250,000,000  
Revolving line of credit   119,000,000 51,300,000
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB      
Debt Instrument [Line Items]      
Borrowed funds   375,400,000 $ 500,000,000
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB | Debt Instrument, Redemption, Period One      
Debt Instrument [Line Items]      
Debt issued   $ 400,000,000  
Stated rate (as a percent)   5.72%  
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB | Debt Instrument, Redemption, Period Two      
Debt Instrument [Line Items]      
Debt issued   $ 100,000,000  
Stated rate (as a percent)   5.65%  
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB | Debt Instrument, Redemption, Period Three      
Debt Instrument [Line Items]      
Debt issued   $ 100,000,000  
Stated rate (as a percent)   5.65%  
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB | Debt Instrument, Redemption, Period Four      
Debt Instrument [Line Items]      
Debt issued   $ 25,000,000  
Stated rate (as a percent)   5.63%  
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB | Debt Instrument, Redemption, Period Five      
Debt Instrument [Line Items]      
Debt issued   $ 25,000,000  
Stated rate (as a percent)   5.66%  
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB | Debt Instrument, Redemption, Period Six      
Debt Instrument [Line Items]      
Debt issued   $ 25,000,000  
Stated rate (as a percent)   5.63%  
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB | Debt Instrument, Redemption, Period Seven      
Debt Instrument [Line Items]      
Debt issued   $ 25,000,000  
Stated rate (as a percent)   5.65%  
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB | Debt Instrument, Redemption, Period Eight      
Debt Instrument [Line Items]      
Debt issued   $ 25,000,000  
Stated rate (as a percent)   5.62%  
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB | Debt Instrument, Redemption, Period Nine      
Debt Instrument [Line Items]      
Debt issued   $ 25,000,000  
Stated rate (as a percent)   5.63%  
Federal Home Loan Bank of Pittsburgh | Term notes payable to FHLB | Debt Instrument, Redemption, Period Ten      
Debt Instrument [Line Items]      
Debt issued   $ 25,000,000  
Stated rate (as a percent)   5.65%  
Federal Home Loan Bank of Pittsburgh | Residential First Mortgage and Other Loans      
Debt Instrument [Line Items]      
Total loans receivable, net   $ 6,049,000,000.000