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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning $ (3,801)    
Other comprehensive loss, net of tax (643) $ (1,783) $ (790)
Balance at the end (5,662) (3,801)  
Unrealized Loss on Securities      
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning [1] (1,936) (591)  
Other comprehensive (loss) income, before reclassifications [1] (37) (1,566)  
Amounts reclassified from accumulated other comprehensive income [1] (5) (602)  
Other comprehensive (loss) income, before tax [1] (42) (2,168)  
Income tax benefit (expense) [1] 16 823  
Other comprehensive loss, net of tax [1] (26) (1,345)  
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02 [2] (538)    
Balance at the end [1] (2,500) (1,936) (591)
Unrecognized Net Pension and Postretirement Costs      
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning [3] (1,865) (1,427)  
Other comprehensive (loss) income, before reclassifications [3] 90 79  
Amounts reclassified from accumulated other comprehensive income [3] (1,085) (786)  
Other comprehensive (loss) income, before tax [3] (995) (707)  
Income tax benefit (expense) [3] 378 269  
Other comprehensive loss, net of tax [3] (617) (438)  
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02 [2] (680)    
Balance at the end [3] (3,162) (1,865) (1,427)
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss)      
Balance at the beginning (3,801) (2,018)  
Other comprehensive (loss) income, before reclassifications 53 (1,487)  
Amounts reclassified from accumulated other comprehensive income (1,090) (1,388)  
Other comprehensive (loss) income, before tax (1,037) (2,875)  
Income tax benefit (expense) 394 1,092  
Other comprehensive loss, net of tax (643) (1,783) (790)
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02 [2] (1,218)    
Balance at the end $ (5,662) $ (3,801) $ (2,018)
[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] As of December 31, 2017, the Company elected to early adopt and retrospectively apply the reclassification of stranded income tax effects from accumulated other comprehensive loss to retained earnings, as permitted under ASU 2018-02.
[3] The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost. See Note 11.