Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 13,502	$ 10,527
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	13,244	10,221
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	258	306
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	13,502	10,527
TOTAL Balance	(7,501)	(23,454)
TOTAL Balance	6,001	(12,927)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	13,098	10,224
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	13,244	10,221
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	(146)	3
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	13,098	10,224
TOTAL Balance	14,893	(6,105)
TOTAL Balance	27,991	4,119
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	404	303
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	0	0
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	404	303
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	404	303
TOTAL Balance	(22,394)	(17,349)
TOTAL Balance	$ (21,990)	$ (17,046)