Derivative Instruments and Hedge Activities - Summary of Other Interest Rate Derivatives (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional Amount	$ 382,435,000	$ 341,358,000
Derivative assets fair value	19,133,000	7,960,000
Derivative liabilities fair value	20,327,000	$ 8,519,000
Other Interest Rate Derivatives
Derivative [Line Items]
Notional Amount	373,782,000
Derivative assets fair value	19,133,000
Derivative liabilities fair value	$ 20,307,000
Weighted average pay rates	4.48%
Weighted average receive rates	2.31%
Weighted average maturity	6 years 1 month 6 days