Accumulated Other Comprehensive Income (Details 1) - 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, Footnote	$ (4,401)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	(4,680)	$ 5,055
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(4,401)	5,229
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	279	174
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
TOTAL Balance	(28,889)	(5,564)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(4,401)	5,229
TOTAL Balance	(24,488)	(10,793)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	(4,680)	5,055
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(4,682)	5,045
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(2)	(10)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
TOTAL Balance	(9,625)	7,156
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(4,682)	5,045
TOTAL Balance	(4,943)	2,111
Unrealized gains losses on securities available-for-sale with other than temporary impairment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
TOTAL Balance	1,967	2,027
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(2,315)	242
TOTAL Balance	4,282	1,785
Unrealized gains losses on securities available-for-sale without other than temporary impairment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
TOTAL Balance	(11,592)	5,129
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(2,367)	4,803
TOTAL Balance	(9,225)	326
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	281	184
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	281	184
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
TOTAL Balance	(19,264)	(12,720)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	281	184
TOTAL Balance	$ (19,545)	$ (12,904)