Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 15,025	$ 647
Other comprehensive income (loss):
Change in net actuarial gain	35	27
Tax effect on change in net actuarial gain	(7)	(6)
Unrealized holding gains (losses) arising during the period	7,773	(395)
Tax effect on unrealized holding gains (losses) arising during the period	(1,632)	83
Reclassification adjustment for (gains) losses included in net income	(4,141)	15
Tax effect on reclassification adjustment for (gains) losses included in net income	870	(3)
Other comprehensive income (loss), net of tax	2,898	(279)
Comprehensive income	$ 17,923	$ 368