CONSOLIDATED CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preferred	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2016						$ (13,581)
Comprehensive income:
Net income	$ 47,329
Other comprehensive income (loss), net of tax	14,965
Ending balance at Jun. 30, 2017						1,384
Beginning balance (in shares) at Dec. 31, 2017		125	49,158,238
Beginning balance at Dec. 31, 2017	1,303,463	$ 125	$ 6,145	$ 834,870	$ 465,231	(2,908)
Comprehensive income:
Net income	76,313				76,313
Other comprehensive income (loss), net of tax	(21,334)					(21,334)
Cash dividends on common stock ($.40 per share)	(19,808)				(19,808)
Reclassification adjustment under ASU 2018-02	0				626	(626)
Share-based compensation (in shares)			98,021
Share-based compensation	1,653		$ 12	1,641
Stock issued under employee benefit plans (in shares)			9,205
Stock issued under employee benefit plans	344		$ 1	343
Stock issued under dividend reinvestment and stock purchase plan (in shares)			12,111
Stock issued under dividend reinvestment and stock purchase plan	$ 555		$ 2	553
Stock options exercised (in shares)	44,932		44,932
Stock options exercised	$ 953		$ 6	947
Stock redeemed (in shares)			(42,319)
Stock redeemed	(1,811)		$ (6)	(1,805)
Ending balance (in shares) at Jun. 30, 2018		125	49,280,188
Ending balance at Jun. 30, 2018	$ 1,340,328	$ 125	$ 6,160	$ 836,549	$ 522,362	$ (24,868)