Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Amortized Cost	$ 1,819,950	$ 1,854,852
Preferred Stock, Shares Authorized	200,000	200,000
Preferred Stock, Shares Issued	0	0
Common Stock, Shares Authorized	20,000,000
Common Stock, Shares, Issued	17,623,104	17,623,104
Treasury Stock, Common, Shares	1,449,037	1,359,521