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Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax $ 4,039 $ 6,736
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 4,342 7,226
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 303 490
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TOTAL Balance (5,059) (7,303)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 4,342 7,226
TOTAL Balance (9,401) (14,529)
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 4,039 4,764
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 4,038 4,762
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax (1) (2)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TOTAL Balance 13,091 15,040
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 4,038 4,762
TOTAL Balance 9,053 10,278
Unrealized gains losses on securities available-for-sale with other than temporary impairment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TOTAL Balance 2,211 3,592
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (759) 478
TOTAL Balance 2,970 3,114
Unrealized gains losses on securities available-for-sale without other than temporary impairment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TOTAL Balance 10,880 11,448
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 4,797 4,284
TOTAL Balance 6,083 7,164
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 1,972
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 304 2,464
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 304 492
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
TOTAL Balance (18,150) (22,343)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 304 2,464
TOTAL Balance $ (18,454) $ (24,807)