CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets:
Investment securities, available for sale, amortized cost	$ 1,319,395	$ 1,198,513
Debt securities, held-to-maturity, fair value	$ 32,631	$ 35,942
Shareholders’ Equity:
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	170,000,000	170,000,000
Common stock, shares issued (in shares)	82,455,432	82,334,257
Common stock, shares outstanding (in shares)	82,455,432	82,334,257