Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	[1]	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period at Dec. 31, 2019	$ 725,263	$ 560,263	$ 162,752		$ 0	$ 2,248
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,392		12,392
Other comprehensive income, net of tax	6,693					6,693
Treasury stock	(1,452)				(1,452)
Stock based compensation	847	847
Retirement of restricted stock	(457)	(457)
Cash dividends on common stock	(6,364)		(6,364)
Balance at end of period at Mar. 31, 2020	736,922	560,653	168,780		(1,452)	8,941
Balance at beginning of period at Dec. 31, 2020	763,784	562,421	191,418		(1,452)	11,397
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,175		23,175
Other comprehensive income, net of tax	(13,088)					(13,088)
Stock based compensation	1,206	1,206
Retirement of restricted stock	(656)	(656)
Exercise of stock options	13	13
Cash dividends on common stock	(6,369)		(6,369)
Balance at end of period at Mar. 31, 2021	$ 768,065	$ 562,984	$ 208,224		$ (1,452)	$ (1,691)

[1] The Company adopted ASU 2016-13 at December 31, 2020, effective January 1, 2020, adjusting Retained Earnings by a negative $3,395. Retained earnings for the three months ended March 31, 2020 have not been restated.