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Cash and Due from Banks
 12 Months Ended
Dec. 31, 2021
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 ("FRB") based principally on the type and amount of their deposits. During 2021, the Bank maintained balances at the Federal Reserve sufficient to meet reserve requirements, as well as significant excess reserves, on which interest is paid. The average daily balance maintained in 2021 was $2.3 billion and in 2020 was $1.1 billion. The Company also has deposits with other banks that serve as collateral for derivative positions it holds, totaling $6.3 million at December 31, 2021 and $5.1 million at December 31, 2020. Derivative positions are reflected in Other Assets and Liabilities as discussed in Note 10 - Other Derivatives. 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.