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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     $ (3,801)  
Current period other comprehensive income, net of tax $ 99 $ (351) 1,026 $ 1,451
Balance at end of period (2,775)   (2,775)  
Unrealized Gain (Loss) on Securities        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period [1]     (1,936) (591)
Other comprehensive income, before reclassifications [1]     1,588 2,884
Amounts reclassified from accumulated other comprehensive income (loss) [1]     0 (602)
Current period other comprehensive income, before tax [1]     1,588 2,282
Income tax expense [1]     (604) (867)
Current period other comprehensive income, net of tax [1]     984 1,415
Balance at end of period [1] (952) 824 (952) 824
Unrecognized Net Pension and Postretirement Costs        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period [2]     (1,865) (1,427)
Other comprehensive income, before reclassifications [2]     67 59
Amounts reclassified from accumulated other comprehensive income (loss) [2]     0 0
Current period other comprehensive income, before tax [2]     67 59
Income tax expense [2]     (25) (23)
Current period other comprehensive income, net of tax [2]     42 36
Balance at end of period [2] (1,823) (1,391) (1,823) (1,391)
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     (3,801) (2,018)
Other comprehensive income, before reclassifications     1,655 2,943
Amounts reclassified from accumulated other comprehensive income (loss)     0 (602)
Current period other comprehensive income, before tax     1,655 2,341
Income tax expense     (629) (890)
Current period other comprehensive income, net of tax     1,026 1,451
Balance at end of period $ (2,775) $ (567) $ (2,775) $ (567)
[1] The pre-tax amounts reclassified from accumulated other comprehensive loss are included in gain on sale of investment securities in the consolidated statements of income.
[2] The pre-tax amounts reclassified from accumulated other comprehensive loss are included in the computation of net periodic pension cost.