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Accumulated Other Comprehensive Loss (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
 [1]
Jun. 30, 2017
 [1]
Jun. 30, 2018
Jun. 30, 2017
Realized (gains) losses on sale of securities        
Net realized (gains) losses on investment securities $ 0 $ (32) $ 148 [2] $ (59) [2]
Provision for income tax expense 0 11 (31) [2] 20 [2]
Net of tax 0 (21) 117 [2] (39) [2]
Amortization of estimated defined benefit pension plan loss        
Other expense [2]     654 (318)
Provision for income taxes [2]     (137) 108
Net of tax [2]     517 (210)
Total reclassifications for the period [3] $ 0 $ (21) $ 634 [2] $ (249) [2]
[1] Amounts in parentheses indicate credits.
[2] Amounts in parentheses indicate income and other amounts indicate expenses.
[3] Amounts in parentheses indicate debits on the Consolidated Balance Sheets.