Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (4,401)	$ 5,229
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	(4,680)	5,055
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	279	174
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	(4,401)	5,229
TOTAL Balance	(24,488)	(10,793)
TOTAL Balance	(28,889)	(5,564)
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	(4,682)	5,045
Change in Other comprehensive income before reclassification, Unrealized gains and Losses on available-for-sale Securities	(4,680)	5,055
Amount reclassified from accumalted other comperhensive income, unrealized gain and losses and available for sale securities	(2)	(10)
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	(4,682)	5,045
TOTAL Balance	(4,943)	2,111
TOTAL Balance	(9,625)	7,156
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	281	184
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	281	184
Net Current period other comprehensive other income, Unrealized gains and Losses on available-for-sale Securities	281	184
TOTAL Balance	(19,545)	(12,904)
TOTAL Balance	$ (19,264)	$ (12,720)