Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018		Jun. 30, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	$ 242,422	$ 213,556	$ 242,422	$ 213,556	$ 235,701	$ 219,830	[1]	$ 209,879	$ 201,505
Other Comprehensive Income (Loss), Net of Tax	1,625	(1,919)	4,862	(4,637)
Accumulated Pension Plan Adjustment Net Unamortized Gain Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	(328)		(328)		(328)	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0		(328)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0		0
Other Comprehensive Income (Loss), Net of Tax	0		(328)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	139	398	139	398	139	139		398	398
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax	0	0	0	0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	(684)	(217)	(684)	(217)	(737)	(314)		(472)	(1,564)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	53	255	(370)	1,347
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Net of Tax	53	255	(370)	1,347
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	4,719	(3,086)	4,719	(3,086)	3,147	(841)		(912)	2,898
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,916	(2,168)	6,727	(5,355)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(344)	(6)	(1,167)	(629)
Other Comprehensive Income (Loss), Net of Tax	1,572	(2,174)	5,560	(5,984)
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent	3,846	(2,905)	3,846	(2,905)	$ 2,221	$ (1,016)		$ (986)	$ 1,732
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,969	(1,913)	6,029	(4,008)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(344)	(6)	(1,167)	(629)
Other Comprehensive Income (Loss), Net of Tax	$ 1,625	$ (1,919)	$ 4,862	$ (4,637)

[1] Derived from audited consolidated financial statements