CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preferred	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2018		125	49,349,800
Beginning balance at Dec. 31, 2018	$ 1,408,260	$ 125	$ 6,169	$ 840,052	$ 583,336	$ (21,422)
Comprehensive income:
Net income	38,817				38,817
Other comprehensive income (loss), net of tax	19,827					19,827
Cash dividends on common stock	(10,933)				(10,933)
Share-based compensation (in shares)			103,660
Share-based compensation	981		$ 13	968
Stock issued under employee benefit plans (in shares)			5,339
Stock issued under employee benefit plans	174		$ 1	173
Stock issued under dividend reinvestment and stock purchase plan (in shares)			8,508
Stock issued under dividend reinvestment and stock purchase plan	340		$ 1	339
Stock options exercised (in shares)			3,700
Stock options exercised	40			40
Stock redeemed (in shares)			(42,539)
Restricted shares withheld for taxes	(1,658)		$ (5)	(1,653)
Ending balance (in shares) at Mar. 31, 2019		125	49,428,468
Ending balance at Mar. 31, 2019	1,455,848	$ 125	$ 6,179	839,919	611,220	(1,595)
Beginning balance (in shares) at Dec. 31, 2019		125	55,368,482
Beginning balance at Dec. 31, 2019	1,786,437	$ 125	$ 6,921	1,054,997	696,520	27,874
Comprehensive income:
Net income	34,263				34,263
Other comprehensive income (loss), net of tax	25,782					25,782
Cash dividends on common stock	(14,265)				(14,265)
Repurchase of common stock (in shares)			(1,634,437)
Repurchases of common stock	(55,912)		$ (204)	(55,708)
Share-based compensation (in shares)			3,332
Share-based compensation	1,220			1,220
Stock issued under dividend reinvestment and stock purchase plan (in shares)			15,710
Stock issued under dividend reinvestment and stock purchase plan	$ 428		$ 2	426
Stock options exercised (in shares)	1,050		1,050
Stock options exercised	$ 7			7
Ending balance (in shares) at Mar. 31, 2020		125	53,754,137
Ending balance at Mar. 31, 2020	$ 1,777,960	$ 125	$ 6,719	$ 1,000,942	$ 716,518	$ 53,656