Debt - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) subsidiaryBusinessTrust class	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Securities sold under agreements to repurchase	$ 0	$ 19,189,000
Number of classes of financial instruments | class	2
Number of business subsidiary trusts | subsidiaryBusinessTrust	2
Interest Rate Swap
Debt Instrument [Line Items]
Amount of hedged item	$ 20,000,000
ACST III | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Junior Subordinated Debt, Preferred Securities | ACST II | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	3.15%