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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Component of Other Comprehensive Income (Loss) | The tax effects allocated to each component of other comprehensive income (loss) were as follows:
| Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount
2017 |  |  |  |  |
Securities available for sale and transferred securities: |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | 157,016 |  |  | $ | 48,626 |  |  | $ | 108,390 |
Change in net unrealized gain on securities transferred to held to maturity | (16,193 | ) |  | (5,668 | ) |  | (10,525 | )
Reclassification adjustment for net (gains) losses included in net income | 4,941 |  |  | 1,729 |  |  | 3,212 |
Total securities available for sale and transferred securities | 145,764 |  |  | 44,687 |  |  | 101,077 |
Defined-benefit post-retirement benefit plans: |  |  |  |  |
Change in the net actuarial gain/loss | (597 | ) |  | (126 | ) |  | (471 | )
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) | 5,429 |  |  | 1,900 |  |  | 3,529 |
Total defined-benefit post-retirement benefit plans | 4,832 |  |  | 1,774 |  |  | 3,058 |
Total other comprehensive income (loss) | $ | 150,596 |  |  | $ | 46,461 |  |  | $ | 104,135 |
2016 |  |  |  |  |
Securities available for sale and transferred securities: |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | (175,061 | ) |  | $ | (61,271 | ) |  | $ | (113,790 | )
Change in net unrealized gain on securities transferred to held to maturity | (32,207 | ) |  | (11,272 | ) |  | (20,935 | )
Reclassification adjustment for net (gains) losses included in net income | (14,975 | ) |  | (5,242 | ) |  | (9,733 | )
Total securities available for sale and transferred securities | (222,243 | ) |  | (77,785 | ) |  | (144,458 | )
Defined-benefit post-retirement benefit plans: |  |  |  |  |
Change in the net actuarial gain/loss | 1,914 |  |  | 670 |  |  | 1,244 |
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) | 7,274 |  |  | 2,546 |  |  | 4,728 |
Total defined-benefit post-retirement benefit plans | 9,188 |  |  | 3,216 |  |  | 5,972 |
Total other comprehensive income (loss) | $ | (213,055 | ) |  | $ | (74,569 | ) |  | $ | (138,486 | )
2015 |  |  |  |  |
Securities available for sale and transferred securities: |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | (12,450 | ) |  | $ | (4,358 | ) |  | $ | (8,092 | )
Change in net unrealized gain on securities transferred to held to maturity | (33,601 | ) |  | (11,760 | ) |  | (21,841 | )
Reclassification adjustment for net (gains) losses included in net income | (69 | ) |  | (24 | ) |  | (45 | )
Total securities available for sale and transferred securities | (46,120 | ) |  | (16,142 | ) |  | (29,978 | )
Defined-benefit post-retirement benefit plans: |  |  |  |  |
Change in the net actuarial gain/loss | (3,877 | ) |  | (1,357 | ) |  | (2,520 | )
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) | 6,995 |  |  | 2,448 |  |  | 4,547 |
Total defined-benefit post-retirement benefit plans | 3,118 |  |  | 1,091 |  |  | 2,027 |
Total other comprehensive income (loss) | $ | (43,002 | ) |  | $ | (15,051 | ) |  | $ | (27,951 | )
Schedule of Accumulated Other Comprehensive Income, Net of Tax | Activity in accumulated other comprehensive income, net of tax, was as follows:
| Securities Available For Sale |  | Defined Benefit Plans |  | Accumulated Other Comprehensive Income
Balance January 1, 2017 | $ | 16,153 |  |  | $ | (40,776 | ) |  | $ | (24,623 | )
Other comprehensive income (loss) before reclassification | 97,865 |  |  | (471 | ) |  | 97,394 |
Amounts reclassified from accumulated other comprehensive income (loss) | 3,212 |  |  | 3,529 |  |  | 6,741 |
Net other comprehensive income (loss) during period | 101,077 |  |  | 3,058 |  |  | 104,135 |
Balance December 31, 2017 | $ | 117,230 |  |  | $ | (37,718 | ) |  | $ | 79,512 |
Balance January 1, 2016 | $ | 160,611 |  |  | $ | (46,748 | ) |  | $ | 113,863 |
Other comprehensive income (loss) before reclassification | (134,725 | ) |  | 1,244 |  |  | (133,481 | )
Amounts reclassified from accumulated other comprehensive income (loss) | (9,733 | ) |  | 4,728 |  |  | (5,005 | )
Net other comprehensive income (loss) during period | (144,458 | ) |  | 5,972 |  |  | (138,486 | )
Balance December 31, 2016 | $ | 16,153 |  |  | $ | (40,776 | ) |  | $ | (24,623 | )
Balance January 1, 2015 | $ | 190,589 |  |  | $ | (48,775 | ) |  | $ | 141,814 |
Other comprehensive income (loss) before reclassification | (29,933 | ) |  | (2,520 | ) |  | (32,453 | )
Amounts reclassified from accumulated other comprehensive income (loss) | (45 | ) |  | 4,547 |  |  | 4,502 |
Net other comprehensive income (loss) during period | (29,978 | ) |  | 2,027 |  |  | (27,951 | )
Balance December 31, 2015 | $ | 160,611 |  |  | $ | (46,748 | ) |  | $ | 113,863 |

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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