Borrowed Funds - Narrative (Details)		6 Months Ended
	Sep. 09, 2020 USD ($)	Jun. 30, 2024 USD ($) business_trust advance	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Total loans receivable, net		$ 11,229,294,000		$ 11,289,566,000
Borrowed funds		242,363,000		398,895,000
Subordinated debt		$ 114,364,000		114,189,000
Number of statutory business trusts owned | business_trust		7
Trust Preferred Investments
Debt Instrument [Line Items]
Interest paid, net		$ 5,000,000	$ 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		26,213,000		35,495,000
Cash and securities collateral		36,000,000
Collateral received, due within one year
Debt Instrument [Line Items]
Borrowed funds		41,150,000		24,900,000
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		$ 2,000,000	$ 2,000,000
Federal Home Loan Bank of Pittsburgh
Debt Instrument [Line Items]
Number of advances | advance		7
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		0		164,000,000
Federal Home Loan Bank of Pittsburgh | Term notes payable to the FHLB of Pittsburgh, due within one year
Debt Instrument [Line Items]
Borrowed funds		175,000,000		$ 175,000,000
Federal Home Loan Bank of Pittsburgh | Term notes payable to the FHLB of Pittsburgh, due within one year | Debt Instrument, Redemption, Period One
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 the FHLB of Pittsburgh, due within one year | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt issued		$ 25,000,000
Stated rate (as a percent)		5.68%
Federal Home Loan Bank of Pittsburgh | Term notes payable to the FHLB of Pittsburgh, due within one year | Debt Instrument, Redemption, Period Three
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 the FHLB of Pittsburgh, due within one year | Debt Instrument, Redemption, Period Four
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 the FHLB of Pittsburgh, due within one year | Debt Instrument, Redemption, Period Five
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 the FHLB of Pittsburgh, due within one year | Debt Instrument, Redemption, Period Six
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 the FHLB of Pittsburgh, due within one year | 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 | Residential First Mortgage and Other Loans
Debt Instrument [Line Items]
Total loans receivable, net		$ 6,000,000,000.0