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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2014
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | The components of accumulated other comprehensive income included in stockholders’ equity at December 31, 2014 and 2013 are as follows:
December 31 |  | 2014 |  |  | 2013 |
Net unrealized gain on investment securities available-for-sale |  | $ | 6,292 |  |  | $ | 2,810 |
Income tax expense (benefit) |  |  | 2,202 |  |  |  | 984 |
Net of income taxes |  |  | 4,090 |  |  |  | 1,826 |
Benefit plan adjustments |  |  | (7,567 | ) |  |  | (3,883 | )
Income tax expense (benefit) |  |  | (2,648 | ) |  |  | (1,359 | )
Net of income taxes |  |  | (4,919 | ) |  |  | (2,524 | )
Accumulated other comprehensive loss |  | $ | (829 | ) |  | $ | (698 | )
Other Comprehensive Income (Loss) and Related Tax Effects | Other comprehensive income (loss) and related tax effects for the years ended December 31, 2014, 2013 and 2012 are as follows:
Year ended December 31 |  | 2014 |  |  | 2013 |  |  | 2012 |
Net gain on the sale of investment securities available-for-sale(1) |  | $ | (861 | ) |  | $ | (163 | ) |  | $ | (317 | )
Unrealized gain (loss) on investment securities available-for-sale |  |  | 4,343 |  |  |  | (3,882 | ) |  |  | 1,223 |
Benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of actuarial loss (gain)(2) |  |  | 92 |  |  |  | 276 |  |  |  | 136 |
Actuarial (loss) gain |  |  | (3,776 | ) |  |  | 3,366 |  |  |  | (1,060 | )
Net change in benefit plan liabilities |  |  | (3,684 | ) |  |  | 3,642 |  |  |  | (924 | )
Other comprehensive income (loss) gain before taxes |  |  | (202 | ) |  |  | (403 | ) |  |  | (18 | )
Income tax expense (benefit) |  |  | (71 | ) |  |  | 5 |  |  |  | (6 | )
Other comprehensive income (loss) |  | $ | (131 | ) |  | $ | (408 | ) |  | $ | (12 | )
(1) | Represents amounts reclassified out of accumulated comprehensive income and included in gains on sale of investment securities on the consolidated statements of income.
(2) | Represents amounts reclassified out of accumulated comprehensive income and included in the computation of net periodic pension expense. Refer to Note 15 included in these consolidated financial statements.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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