Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance at Dec. 31, 2018	$ 603,804	$ 239	$ (42,655)	$ 350,936	$ 304,566	$ (9,282)
Net income	16,156	0	0	0	16,156	0
Other comprehensive income	10,772	0	0	0	0	10,772
Comprehensive income	26,928	0	0	0	16,156	10,772
Cash dividends paid on common shares	(3,763)	0	0	0	3,763	0
Issuance under equity compensation plans, net	(1,940)	(1)	0	(1,941)	0	0
Share-based Payment Arrangement, Noncash Expense	921	0	0	921	0	0
Shares issued in connection with acquisition	171,885	40	0	171,845	0	0
Ending balance at Mar. 31, 2019	797,835	280	(42,655)	521,761	316,959	1,490
Beginning balance at Dec. 31, 2019	867,185	281	(58,181)	526,599	380,737	17,749
Net income	12,868	0	0	0	12,868	0
Other comprehensive income	5,348	0	0	0	0	5,348
Comprehensive income	18,216	0	0	0	12,868	5,348
Cash dividends paid on common shares	(4,743)	0	0	0	(4,743)	0
Repurchase of common stock	(15,347)	0	(15,347)	0	0	0
Issuance under equity compensation plans, net	(1,721)	0	0	(1,721)	0	0
Share-based Payment Arrangement, Noncash Expense	960	0	0	960	0	0
Reclassification for the adoption of new accounting standards	(18,114)	0	0	0	(18,114)	0
Ending balance at Mar. 31, 2020	$ 846,436	$ 281	$ (73,528)	$ 525,838	$ 370,748	$ 23,097