Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Assets
Securities available-for-sale, amortized cost	$ 3,191,329,000	$ 3,256,289,000
Securities available-for-sale, allowance for credit Losses (ACL)	0	0
Securities held to maturity, net of ACL	0	0
Securities held to maturity, fair value	$ 594,204,000	$ 353,511,000
Shareholders' Equity
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	250,000,000	250,000,000
Common stock, issued (in shares)	61,463,392	61,648,679
Common stock, outstanding (in shares)	61,463,392	61,648,679