Cash and Due from Banks	12 Months Ended
	Dec. 31, 2022
Cash and Cash Equivalents [Abstract]
Cash and Due from Banks	Cash and Due from BanksRegulation D of the Federal Reserve Act requires that banks maintain noninterest reserve balances with the Federal Reserve Bank of Richmond ("Federal Reserve Bank") based principally on the type and amount of their deposits. During 2022, the Bank maintained balances at the Federal Reserve sufficient to meet reserve requirements, as well as excess reserves, on which interest is paid. The average daily balance maintained in 2022 was $1.3 billion and in 2021 was $2.3 billion. Additionally, the Bank maintains interest-bearing balances with the Federal Home Loan Bank ("FHLB") of Atlanta and noninterest bearing balances with domestic correspondent banks to cover associated costs for services they provide to the Bank.