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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Unrealized Gain (Loss) on Securities        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period [1]     $ (591) $ 214
Other comprehensive income (loss), before reclassifications [1]     2,884 1,012
Amounts reclassified from accumulated other comprehensive income (loss) [1]     (602) (8)
Current period other comprehensive income, before tax [1]     2,282 1,004
Income tax expense [1]     (867) (382)
Current period other comprehensive income, net of tax [1]     1,415 622
Balance at end of period [1] $ 824 $ 836 824 836
Unrecognized Net Pension and Postretirement Costs        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period [2]     (1,427) (1,442)
Other comprehensive income (loss), before reclassifications [2]     59 108
Amounts reclassified from accumulated other comprehensive income (loss) [2]     0 0
Current period other comprehensive income, before tax [2]     59 108
Income tax expense [2]     (23) (40)
Current period other comprehensive income, net of tax [2]     36 68
Balance at end of period [2] (1,391) (1,374) (1,391) (1,374)
Accumulated Other Comprehensive (Loss) Income        
Accumulated Other Comprehensive Income (Loss)        
Balance at beginning of period     (2,018) (1,228)
Other comprehensive income (loss), before reclassifications     2,943 1,120
Amounts reclassified from accumulated other comprehensive income (loss)     (602) (8)
Current period other comprehensive income, before tax     2,341 1,112
Income tax expense     (890) (422)
Current period other comprehensive income, net of tax     1,451 690
Balance at end of period (567) (538) (567) (538)
Balance at beginning of period     (2,018)  
Current period other comprehensive income, net of tax (351) $ 1,017 1,451 $ 690
Balance at end of period $ (567)   $ (567)  
[1] The pre-tax amounts reclassified from accumulated other comprehensive income (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 income (loss) are included in the computation of net periodic pension cost.