CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Investment securities held to maturity - fair value	$ 1,152,518	$ 827,566
Loans - allowance for loan losses	$ 126,726	$ 80,284
Preferred Stock, par value (in dollars per share)	$ 1,000	$ 1,000
Preferred Stock, liquidation value per share (in dollars per share)	$ 1,000	$ 1,000
Preferred Stock, authorized (in shares)	600	600
Preferred Stock, issued (in shares)	125	125
Preferred Stock, outstanding (in shares)	125	125
Common Stock, stated value (in dollars per share)	$ 0.125	$ 0.125
Common Stock, authorized (in shares)	100,000,000	100,000,000
Common Stock, issued (in shares)	53,891,733	55,368,482
Common Stock, outstanding (in shares)	53,891,733	55,368,482