Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Amortized Cost	$ 985,045	$ 1,028,883
Securities held-to-maturity, fair value	$ 359,620	$ 351,422
Preferred Stock, Shares Authorized	200,000	200,000
Preferred Stock, Shares Issued	0	0
Common stock no par value	$ 0	$ 0
Common stock shares authorized	20,000,000	20,000,000
Common Stock, Shares, Issued	16,586,153	16,586,165
Treasury stock shares	955,654	887,987