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Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of Net Retirement Plan Actuarial Loss $ 64 [1] $ 111 [1] $ 245 $ 314 [1]
Income before provision for income taxes 10,443 9,429 29,990 28,490
Provision for Income Taxes 3,027 2,691 8,735 8,556
Net Income (56) (110) (234) (221)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available for Sale Securities        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Gain on Securities Transactions 10 0 10 144
Income before provision for income taxes 10 0 10 144
Provision for Income Taxes (4) 0 (4) (56)
Net Income 6 0 6 88
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment        
Reclassification out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of Net Retirement Plan Actuarial Loss 3 [2],[3] 3 [2],[3] 8 [2],[3] 7
Amortization of Net Retirement Plan Actuarial Loss, Before-Tax Amount (179) [2],[3] (181) [2],[3] (537) [2],[3] (503)
Income before provision for income taxes (176) (178) (529) (496)
Provision for Income Taxes 114 68 289 187
Net Income $ (62) $ (110) $ (240) $ (309)
[1] All amounts are net of tax. Amounts in parentheses indicate debits.
[2] Amounts in parentheses indicate debits to profit/loss.
[3] These accumulated other comprehensive income components are included in the computation of net periodic pension cost.