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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The activity in accumulated other comprehensive loss is presented in the tables below (in thousands). The activity is shown net of tax, which is calculated using a combined Federal and state income tax rate approximating 37%. The impact of the change in the corporate tax rate as a result of the Tax Cuts and Jobs Act ("TCJA") from 35% to 21% is shown in the reclassification of residual tax effect of corporate tax rate reduction line item in the table below. As a result, the accumulated other comprehensive loss balances at December 31, 2017 reflect a combined Federal and state income tax rate approximating 23%.
| Accumulated Other Comprehensive Loss
|  | Unrealized |
|  | Gains (Losses) on |
| Defined Benefit | Securities |
| Pension Plans | Available-for-Sale | Total
Balance at December 31, 2015 | $ | (4,759 | ) | $ | 927 |  | $ | (3,832 | )
Other comprehensive income before reclassifications | 99 |  | (1,063 | ) | (964 | )
Amounts reclassified from other comprehensive loss | — |  | (2,216 | ) | (2,216 | )
| 99 |  | (3,279 | ) | (3,180 | )
Balance at December 31, 2016 | $ | (4,660 | ) | $ | (2,352 | ) | $ | (7,012 | )
Other comprehensive income (loss) before reclassifications | 528 |  | 4,658 |  | 5,186 |
Amounts reclassified from other comprehensive loss | — |  | (2,819 | ) | (2,819 | )
| 528 |  | 1,839 |  | 2,367 |
Reclassification of residual tax effect of corporate tax rate reduction | (901 | ) | (98 | ) | (999 | )
Balance at December 31, 2017 | $ | (5,033 | ) | $ | (611 | ) | $ | (5,644 | )
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income |
| Amount reclassified from Other Comprehensive Loss | Affected line item
| December 31, | in the Statements
| 2017 | 2016 | 2015 | of Income
Securities available-for-sale: |  |  |  |
Net securities gains reclassified into earnings | $ | (4,476 | ) | $ | (3,513 | ) | $ | (2,130 | ) | Gains on sale of investment securities
Related income tax expense | 1,657 |  | 1,297 |  | 786 |  | Income tax expense
Net effect on accumulated other comprehensive (loss) | $ | (2,819 | ) | $ | (2,216 | ) | $ | (1,344 | ) |

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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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=84228862&loc=SL7669686-108580 + Details
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