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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     $ (5,662)  
Current period other comprehensive (loss) income, net of tax $ (892) $ 99 (2,964) $ 1,026
Balance at end of period (8,626)   (8,626)  
Unrealized Gain (Loss) on Securities        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period [1]     (2,500) (1,936)
Other comprehensive (loss) income, before reclassifications [1]     (3,915) 1,588
Amounts reclassified from accumulated other comprehensive (loss) income [1]     0 0
Current period other comprehensive (loss) income, before tax [1]     (3,915) 1,588
Income tax expense (benefit) [1]     822 (604)
Current period other comprehensive (loss) income, net of tax [1]     (3,093) 984
Balance at end of period [1] (5,593) (952) (5,593) (952)
Unrecognized Net Pension and Postretirement Costs        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period [2]     (3,162) (1,865)
Other comprehensive (loss) income, before reclassifications [2]     164 67
Amounts reclassified from accumulated other comprehensive (loss) income [2]     0 0
Current period other comprehensive (loss) income, before tax [2]     164 67
Income tax expense (benefit) [2]     (35) (25)
Current period other comprehensive (loss) income, net of tax [2]     129 42
Balance at end of period [2] (3,033) (1,823) (3,033) (1,823)
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     (5,662) (3,801)
Other comprehensive (loss) income, before reclassifications     (3,751) 1,655
Amounts reclassified from accumulated other comprehensive (loss) income     0 0
Current period other comprehensive (loss) income, before tax     (3,751) 1,655
Income tax expense (benefit)     787 (629)
Current period other comprehensive (loss) income, net of tax     (2,964) 1,026
Balance at end of period $ (8,626) $ (2,775) $ (8,626) $ (2,775)
[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.