CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2018		15,591,914
Beginning Balance at Dec. 31, 2018	$ 435,825	$ 158,215	$ 302,030	$ (24,420)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	14,273		14,273
Other comprehensive income, net of tax	10,116			10,116
Stock-based compensation expense	458	$ 458
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		24,208
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings	(215)	$ (215)
Cash dividends declared	(4,687)		(4,687)
Common stock repurchased	(2,306)	$ 2,306
Common stock repurchased (in shares)		(55,557)
Ending Balance (in shares) at Mar. 31, 2019		15,560,565
Ending Balance at Mar. 31, 2019	453,718	$ 156,152	311,870	(14,304)
Beginning Balance (in shares) at Dec. 31, 2019		15,144,719
Beginning Balance at Dec. 31, 2019	473,415	$ 139,103	340,580	(6,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	13,493		13,493
Other comprehensive income, net of tax	18,309			18,309
Stock-based compensation expense	421	$ 421
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings and tax benefit (shares)		23,909
Exercise of stock options and issuance of vested share awards, net of repurchase for tax withholdings	(53)	$ (53)
Cash dividends declared	(4,932)		(4,932)
Common stock repurchased	(7,973)	$ 7,973
Common stock repurchased (in shares)		(217,031)
Ending Balance (in shares) at Mar. 31, 2020		14,951,597
Ending Balance at Mar. 31, 2020	$ 492,680	$ 131,498	$ 349,141	$ 12,041