Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (1,016)	$ 1,732	$ (3,262)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2,275)	4,687
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(473)	9
Other Comprehensive Income (Loss), Net of Tax	(2,748)	4,696	(2,806)
AOCI reclass related to TCJA enactment		298
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	139	398	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(259)	328
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Other Comprehensive Income (Loss), Net of Tax	(259)	328
AOCI reclass related to TCJA enactment		70
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(314)	(1,564)	(2,906)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,250	1,610
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Other Comprehensive Income (Loss), Net of Tax	1,250	1,610
AOCI reclass related to TCJA enactment		(268)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(841)	2,898	$ (356)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(3,266)	2,749
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(473)	9
Other Comprehensive Income (Loss), Net of Tax	$ (3,739)	2,758
AOCI reclass related to TCJA enactment		$ 496