Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 0
Debt Securities, Available-for-sale, Amortized Cost	$ 1,363,823	$ 1,007,834
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	17,623,143	17,623,163
Treasury Stock, Shares	1,282,371	1,308,966