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Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Net of Tax, Footnote $ 4,427      
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax 4,128 $ (3,700) $ 22,702 $ (16,079)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 4,427 (3,421)   (15,240)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 299 279 897 839
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
TOTAL Balance 145 (32,310) 145 (32,310)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 4,427 (3,421) 23,599 (15,240)
TOTAL Balance (4,282) (28,889) (23,454) (14,704)
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 4,128 (3,700) 22,702 (16,079)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 4,124 (3,702)   (16,083)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax (4) (2) (13) (4)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
TOTAL Balance 16,584 (13,327) 16,584 (13,327)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 4,124 (3,702) 22,689 (12,721)
TOTAL Balance 12,460 (9,625) (6,105) 2,258
Unrealized gains losses on securities available-for-sale with other than temporary impairment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
TOTAL Balance 2,698 1,975 2,698 1,975
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 236 8 357 (1,654)
TOTAL Balance 2,462 1,967 2,341 3,629
Unrealized gains losses on securities available-for-sale without other than temporary impairment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
TOTAL Balance 13,886 (15,302) 13,886 (15,302)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 3,888 (3,710) 22,332 (11,067)
TOTAL Balance 9,998 (11,592) (8,446) (1,371)
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 0 0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 303 281   843
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 303 281 910 843
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
TOTAL Balance (16,439) (18,983) (16,439) (18,983)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 303 281 910 (2,519)
TOTAL Balance $ (16,742) $ (19,264) $ (17,349) $ (16,962)