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Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income (Loss), Net of Tax, Footnote $ (9,784)  
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax (7,699) $ 3,189
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax (9,784) 3,371
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 281 182
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TOTAL Balance (24,488) (10,793)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (7,418) 3,371
TOTAL Balance (14,704) (14,164)
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 (7,699) 3,189
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax (7,201) 3,188
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 0 (1)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TOTAL Balance (4,943) 2,111
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (7,201) 3,188
TOTAL Balance 2,258 (1,077)
Unrealized gains losses on securities available-for-sale with other than temporary impairment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TOTAL Balance 4,282 1,785
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 653 (156)
TOTAL Balance 3,629 1,941
Unrealized gains losses on securities available-for-sale without other than temporary impairment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TOTAL Balance (9,225) 326
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (7,854) 3,344
TOTAL Balance (1,371) (3,018)
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 (2,583) 183
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 281 183
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TOTAL Balance (19,545) (12,904)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (2,583) 183
TOTAL Balance $ (16,962) $ (13,087)