Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Securities, Available-for-Sale, Amortized Cost	$ 1,869,198,000	$ 1,172,175,000
Securities, Available-for-Sale, Allowance for Credit Losses	$ 0	$ 0
Common Stock, stated value (in dollars per share)	$ 1	$ 1
Common Stock, shares authorized (in shares)	45,000,000	45,000,000