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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance [1] $ (12,950) $ (11,577)
Other comprehensive income (loss) before reclassifications [1] (799) (148)
Amounts reclassified from accumulated other comprehensive loss [1],[2] 425 242
Net current period other comprehensive income (loss) [1] (374) 94
Ending balance [1] (13,324) (11,483)
Net Unrealized Gains and (Losses) on Investment Securities AFS [Member]    
Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance [1] (327) (171)
Other comprehensive income (loss) before reclassifications [1] (1,316) 62
Amounts reclassified from accumulated other comprehensive loss [1] 117 (18)
Net current period other comprehensive income (loss) [1] (1,199) 44
Ending balance [1] (1,526) (127)
Defined Benefit Pension Items [Member]    
Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance [1] (12,623) (11,406)
Other comprehensive income (loss) before reclassifications [1] 517 (210)
Amounts reclassified from accumulated other comprehensive loss [1] 308 260
Net current period other comprehensive income (loss) [1] 825 50
Ending balance [1] $ (11,798) $ (11,356)
[1] Amounts in parentheses indicate debits on the Consolidated Balance Sheets.
[2] Amounts in parentheses indicate credits.