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, 2015						$ (1,362)
Comprehensive income
Net income	$ 58,758
Other comprehensive income, net of tax	5,286
Issuance of common stock related to acquisition
Ending balance at Sep. 30, 2016						3,924
Beginning balance (in shares) at Dec. 31, 2016		125	40,912,697
Beginning balance at Dec. 31, 2016	901,657	$ 125	$ 5,114	$ 509,018	$ 400,981	(13,581)
Comprehensive income
Net income	71,687				71,687
Other comprehensive income, net of tax	7,223					7,223
Cash dividends on common stock ($.51 per share)	(22,909)				(22,909)
Issuance of common stock related to acquisition (in shares)			8,044,446
Issuance of common stock related to acquisition	321,431		$ 1,006	320,425
Share-based compensation (in shares)			84,795
Share-based compensation	1,884		$ 11	1,873
Stock issued under employee benefit plans (in shares)			10,781
Stock issued under employee benefit plans	367		$ 1	366
Stock issued under dividend reinvestment and stock purchase plan (in shares)			17,557
Stock issued under dividend reinvestment and stock purchase plan	$ 714		$ 2	712
Stock options exercised (in shares)	101,759		101,759
Stock options exercised	$ 2,323		$ 13	2,310
Stock redeemed (in shares)			(31,441)
Stock redeemed	(1,257)		$ (4)	(1,253)
Ending balance (in shares) at Sep. 30, 2017		125	49,140,594
Ending balance at Sep. 30, 2017	$ 1,283,120	$ 125	$ 6,143	$ 833,451	$ 449,759	$ (6,358)