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Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Net of Tax, Footnote $ 8,645      
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax 8,353 $ (4,680) $ 18,574 $ (12,379)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 8,645 (4,401)   (11,819)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 292 279 598 560
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
TOTAL Balance (4,282) (28,889) (4,282) (28,889)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 8,645 (4,401) 19,172 (11,819)
TOTAL Balance (12,927) (24,488) (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 8,353 (4,680) 18,574 (12,379)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 8,341 (4,682)   (12,381)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax (12) (2) (9) (2)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
TOTAL Balance 12,460 (9,625) 12,460 (9,625)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 8,341 (4,682) 18,565 (9,019)
TOTAL Balance 4,119 (4,943) (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 2,462 1,967 2,462 1,967
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 63 (2,315) 121 (1,662)
TOTAL Balance 2,399 4,282 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 9,998 (11,592) 9,998 (11,592)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 8,278 (2,367) 18,444 (7,357)
TOTAL Balance 1,720 (9,225) (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 304 281   562
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 304 281 607 562
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
TOTAL Balance (16,742) (19,264) (16,742) (19,264)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 304 281 607 (2,800)
TOTAL Balance $ (17,046) $ (19,545) $ (17,349) $ (16,962)