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Accumulated Comprehensive Income (loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance     $ 123,268  
Other comprehensive income (loss) before reclassifications (net of tax) $ 432 $ 1,184 478 $ 2,301
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) 20 (45) (55) (23)
Other comprehensive income, net of tax 452 1,139 423 2,278
Ending Balance 127,770   127,770  
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (1,421) 903 (1,392) (236)
Ending Balance (969) 2,042 (969) 2,042
Unrealized Gain (Loss) on Available for Sale Securities [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance 1,238 3,303 1,306 2,204
Other comprehensive income (loss) before reclassifications (net of tax) 432 1,184 478 2,301
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) (15) (84) (129) (102)
Other comprehensive income, net of tax 417 1,100 349 2,199
Ending Balance 1,655 4,403 1,655 4,403
Defined Benefit Pension Items [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (2,659) (2,400) (2,698) (2,440)
Other comprehensive income (loss) before reclassifications (net of tax) 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) 35 39 74 79
Other comprehensive income, net of tax 35 39 74 79
Ending Balance $ (2,624) $ (2,361) $ (2,624) $ (2,361)