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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
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]     1,452 3,357
Amounts reclassified from accumulated other comprehensive income (loss) [1]     0 (490)
Current period other comprehensive income, before tax [1]     1,452 2,867
Income tax expense [1]     (552) (1,090)
Current period other comprehensive income, net of tax [1]     900 1,777
Balance at end of period [1] $ (1,036) $ 1,186 (1,036) 1,186
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]     45 39
Amounts reclassified from accumulated other comprehensive income (loss) [2]     0 0
Current period other comprehensive income, before tax [2]     45 39
Income tax expense [2]     (18) (14)
Current period other comprehensive income, net of tax [2]     27 25
Balance at end of period [2] (1,838) (1,402) (1,838) (1,402)
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     (3,801) (2,018)
Other comprehensive income, before reclassifications     1,497 3,396
Amounts reclassified from accumulated other comprehensive income (loss)     0 (490)
Current period other comprehensive income, before tax     1,497 2,906
Income tax expense     (570) (1,104)
Current period other comprehensive income, net of tax     927 1,802
Balance at end of period (2,874) (216) (2,874) (216)
Balance at beginning of period     (3,801)  
Current period other comprehensive income, net of tax 608 $ 838 927 $ 1,802
Balance at end of period $ (2,874)   $ (2,874)  
[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.