Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,066	$ 6,376	$ 5,140	$ 11,719
Other comprehensive income (loss):
Change in net actuarial gain	29	26	57	52
Tax effect on change in net actuarial gain	(10)	(9)	(20)	(18)
Unrealized holding gains (losses) arising during the period	4,358	(4,106)	5,729	2,963
Tax effect on unrealized holding gains (losses) arising during the period	(1,525)	1,437	(2,005)	(1,037)
Reclassification adjustment for (gains) losses included in net income	(410)	(4,992)	(484)	(5,853)
Tax effect on reclassification adjustment for gains (losses) included in net income	143	1,747	169	2,048
Other comprehensive income (loss), net of tax	2,585	(5,897)	3,446	(1,845)
Comprehensive income	$ 3,651	$ 479	$ 8,586	$ 9,874