Derivatives and Hedging Activities - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) swap	Dec. 31, 2022 USD ($) swap	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Hedge ineffectiveness	$ 47,000	$ 0	$ 0
Loss on extinguishment of debt	(300,000)	0	(2,851,000)
Accrued interest on derivative, at fair value	1,200,000	22,000
Net liability position	6,100,000
Collateral against obligations	2,400,000
Interest Rate Swap
Derivative [Line Items]
Derivative gains (losses) recorded in the Statements of Income	(302,000)	489,000	$ 115,000
Interest Rate Swap | Fair Value Hedging
Derivative [Line Items]
Notional amount of derivative	$ 700,000,000
Number of interest rate derivatives held | swap	8
FHLB advances | Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative	$ 380,000,000	290,000,000
Not Designated as Hedging Instrument | Currency forward contract - non-designated hedge
Derivative [Line Items]
Notional amount of derivative	0	0
Not Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative	$ 277,800,000	$ 205,000,000
Number of commercial banking customers | swap	80	54
Designated as Hedging Instrument | FHLB advances | Interest Rate Swap | Cash Flow Hedging
Derivative [Line Items]
Notional amount of derivative	$ 380,000,000	$ 290,000,000
Number of interest rate derivatives held | swap	30	20
Designated as Hedging Instrument | Commercial Loan | Interest Rate Swap | Cash Flow Hedging
Derivative [Line Items]
Notional amount of derivative	$ 100,000,000	$ 100,000,000
Number of interest rate derivatives held | swap	2	2