CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Allowance for credit losses	$ 245	$ 245
Investment securities held to maturity - fair value	$ 1,820,451	$ 1,870,374
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)	58,564,819	59,424,122
Common Stock, outstanding (in shares)	58,564,819	59,424,122
Cumulative Preferred Stock
Preferred stock, par value (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, liquidation value (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
Series A Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, liquidation value (in dollars per share)	$ 2,500	$ 2,500
Preferred Stock, authorized (in shares)	10,000	10,000
Preferred Stock, issued (in shares)	10,000	10,000
Preferred Stock, outstanding (in shares)	10,000	10,000