Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period at Dec. 31, 2018	$ 623,739	$ 514,703	$ 116,874	$ 0	$ (7,838)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,626		15,626
Other comprehensive income, net of tax	4,149				4,149
Stock based compensation	696	696
Issuance of stock for Highlands acquisition	43,417	43,417
Retirement of restricted stock	(571)	(571)
Cash dividends on common stock of $0.115 per share	(5,838)		(5,838)
Balance at end of period at Mar. 31, 2019	681,343	558,245	126,787	0	(3,689)
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
Purchase of treasury stock, 131,035 shares	(1,452)			(1,452)
Stock based compensation	847	847
Retirement of restricted stock	(457)	(457)
Cash dividends on common stock of $0.115 per share	(6,364)		(6,364)
Balance at end of period at Mar. 31, 2020	$ 736,922	$ 560,653	$ 168,780	$ (1,452)	$ 8,941