Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Securities available-for-sale, amortized cost	$ 1,203,988	$ 1,436,714
Securities held-to-maturity, fair value	$ 200,538	$ 151,428
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	16,150,820	16,150,854
Treasury stock shares	820,039	820,039