Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Amortized Cost	$ 1,800,956	$ 1,727,363
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	17,623,106	17,623,118
Treasury Stock, Shares	1,373,798	1,403,555