Borrowed Funds - Capital Debt Securities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Junior subordinated debentures	$ 129,703	$ 129,574
Trust Preferred Investments
Debt Instrument [Line Items]
Capital debt securities	128,875
Junior subordinated debentures	$ 129,703	129,574
Trust Preferred Investments | Northwest Bancorp Capital Trust III
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.38%
Capital debt securities	$ 50,000
Junior subordinated debentures	$ 51,547	51,547
Trust Preferred Investments | Northwest Bancorp Statutory Trust IV
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.38%
Capital debt securities	$ 50,000
Junior subordinated debentures	$ 51,547	51,547
Trust Preferred Investments | LNB Trust II
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.48%
Capital debt securities	$ 7,875
Junior subordinated debentures	$ 8,119	8,119
Trust Preferred Investments | Union National Capital Trust I
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.85%
Capital debt securities	$ 8,000
Junior subordinated debentures	$ 8,012	7,999
Trust Preferred Investments | Union National Capital Trust II
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.00%
Capital debt securities	$ 3,000
Junior subordinated debentures	$ 2,809	2,796
Trust Preferred Investments | MFBC Statutory Trust I
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.70%
Capital debt securities	$ 5,000
Junior subordinated debentures	$ 3,840	3,788
Trust Preferred Investments | Universal Preferred Trust
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.69%
Capital debt securities	$ 5,000
Junior subordinated debentures	$ 3,829	$ 3,778