Derivatives and Hedging Activities - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) swap	Dec. 31, 2020 USD ($) swap	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Loss on extinguishment of debt	$ (2,851,000)	$ (1,158,000)	$ 0
Accrued interest on derivative, at fair value	567,000	1,000,000
Net liability position	7,300,000
Collateral against obligations	17,200,000
Interest rate swaps
Derivative [Line Items]
Derivative gains (losses) recorded in the Statements of Income	115,000	(306,000)	$ 204,000
FHLB advances | Interest rate swaps
Derivative [Line Items]
Notional amount of derivative	190,000,000	430,000,000
Not-designated hedge | Currency forward contract - non-designated hedge
Derivative [Line Items]
Notional amount of derivative	0	0
Not-designated hedge | Interest rate swaps
Derivative [Line Items]
Notional amount of derivative	$ 183,400,000	$ 175,100,000
Number of commercial banking customers | swap	52	48
Designated as hedging instrument | FHLB advances | Interest rate swaps
Derivative [Line Items]
Notional amount of derivative	$ 190,000,000	$ 430,000,000
Number of interest rate derivatives held | swap	14	31
Derivatives, notional amount discontinued relative to the hedge	$ 210,000,000
Loss on extinguishment of debt	$ 996,000