Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Securities available-for-sale, amortized cost	$ 1,885,860	$ 1,600,984
Securities available-for-sale, allowance for credit Losses	0	0
Securities held to maturity, net of allowance for credit losses	0	0
Securities held to maturity, fair value	$ 639,665	$ 746,202
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)	63,423,820	64,200,111
Common stock, outstanding (in shares)	63,423,820	64,200,111