Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2019	$ 315	$ 226,691	$ (71,487)	$ 433,960	$ (9,807)	$ 579,672
Impact of adoption of ASC 326 - Credit Losses	0	0	0	(875)	0	(875)
Net income (loss)	0	0	0	(1,390)	0	(1,390)
Award of common shares released from Employee Benefit Trust	0	1,398	0	0	0	1,398
Vesting of restricted stock unit awards	0	(5,626)	5,782	(156)	0	0
Stock-based compensation expense	0	3,430	0	0	0	3,430
Purchase of treasury shares	0	0	(2,342)	0	0	(2,342)
Repurchase of shares to satisfy tax obligation	0	0	(1,493)	0	0	(1,493)
Dividends on common stock	0	0	0	(6,084)	0	(6,084)
Other comprehensive income (loss)	0	0	0	0	(22,633)	(22,633)
Balance at Mar. 31, 2020	315	225,893	(69,540)	425,455	(32,440)	549,683
Balance at Dec. 31, 2020	341	261,533	(69,400)	442,789	(16,266)	618,997
Net income (loss)	0	0	0	19,039	0	19,039
Award of common shares released from Employee Benefit Trust	0	74	0	0	0	74
Vesting of restricted stock unit awards	0	(5,058)	5,211	(153)	0	0
Stock-based compensation expense	0	3,470	0	0	0	3,470
Repurchase of shares to satisfy tax obligation	0	0	(1,290)	0	0	(1,290)
Dividends on common stock	0	0	0	(6,652)	0	(6,652)
Other comprehensive income (loss)	0	0	0	0	5,563	5,563
Balance at Mar. 31, 2021	$ 341	$ 260,019	$ (65,479)	$ 455,023	$ (10,703)	$ 639,201