CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Investment securities, available for sale, amortized cost	$ 959,850	$ 966,900
Debt securities, held-to-maturity, fair value	$ 43,351	$ 47,949
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)	82,058,483	83,265,674
Common stock, shares, outstanding (in shares)	82,058,483	83,265,674