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Accumulated Other Comprehensive Loss (Details 1) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Realized (gains) losses on sale of securities    
Net realized (gains) losses on investment securities [1] $ 148 $ (27)
Provision for income tax expense [1] (31) 9
Net of tax [1] 117 (18)
Amortization of estimated defined benefit pension plan loss    
Other expense [1] 390 395
Provision for income taxes [1] (82) (135)
Net of tax [1] 308 260
Total reclassifications for the period [1],[2] $ 425 $ 242
[1] Amounts in parentheses indicate credits.
[2] Amounts in parentheses indicate debits on the Consolidated Balance Sheets.