Derivatives - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) contract	Sep. 30, 2021 USD ($) contract	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Loss recognized in OCI	$ 200	$ 500
Reclassification from AOCI into income	100	200
Back-to-Back Swap
Derivative [Line Items]
Notional amount	180,610	$ 180,610	$ 182,379
Weighted average maturity (in years)		6 years 10 months 24 days	7 years 6 months
Back-to-Back Swap | Other Assets and Other Liabilities
Derivative [Line Items]
Fair value of derivative assets and liabilities	9,110	$ 9,110	$ 13,339
Interest Rate Floor
Derivative [Line Items]
Notional amount	$ 300,000	$ 300,000	300,000
Number of derivative contracts | contract	2	2
Amount expected to be reclassified from accumulated other comprehensive income into interest income		$ 400
Interest Rate Floor | Other Assets
Derivative [Line Items]
Fair value of derivative assets and liabilities	$ 514	514	1,004
Fair value of derivative assets	500	500	$ 1,000
Interest Rate Floor, October 2023 Maturity
Derivative [Line Items]
Notional amount	150,000	150,000
Interest Rate Floor, November 2023 Maturity
Derivative [Line Items]
Notional amount	$ 150,000	$ 150,000