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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2019
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
2019 |  |  |  |  |
Securities available for sale and transferred securities: |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | 418,556 |  |  | $ | 87,897 |  |  | $ | 330,659 |
Change in net unrealized gain on securities transferred to held to maturity | (1,292 | ) |  | (271 | ) |  | (1,021 | )
Reclassification adjustment for net (gains) losses included in net income | (293 | ) |  | (62 | ) |  | (231 | )
Total securities available for sale and transferred securities | 416,971 |  |  | 87,564 |  |  | 329,407 |
Defined-benefit post-retirement benefit plans: |  |  |  |  |
Change in the net actuarial gain/loss | (3,644 | ) |  | (765 | ) |  | (2,879 | )
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) | 5,623 |  |  | 1,181 |  |  | 4,442 |
Total defined-benefit post-retirement benefit plans | 1,979 |  |  | 416 |  |  | 1,563 |
Total other comprehensive income (loss) | $ | 418,950 |  |  | $ | 87,980 |  |  | $ | 330,970 |
2018 |  |  |  |  |
Securities available for sale and transferred securities: |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | (182,340 | ) |  | $ | (38,292 | ) |  | $ | (144,048 | )
Change in net unrealized gain on securities transferred to held to maturity | (8,818 | ) |  | (1,853 | ) |  | (6,965 | )
Reclassification adjustment for net (gains) losses included in net income | 156 |  |  | 33 |  |  | 123 |
Total securities available for sale and transferred securities | (191,002 | ) |  | (40,112 | ) |  | (150,890 | )
Defined-benefit post-retirement benefit plans: |  |  |  |  |
Change in the net actuarial gain/loss | (7,225 | ) |  | (1,517 | ) |  | (5,708 | )
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) | 5,002 |  |  | 1,051 |  |  | 3,951 |
Total defined-benefit post-retirement benefit plans | (2,223 | ) |  | (466 | ) |  | (1,757 | )
Total other comprehensive income (loss) | $ | (193,225 | ) |  | $ | (40,578 | ) |  | $ | (152,647 | )
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 |
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, 2019 | $ | (16,103 | ) |  | $ | (47,497 | ) |  | $ | (63,600 | )
Other comprehensive income (loss) before reclassification | 329,638 |  |  | (2,879 | ) |  | 326,759 |
Reclassification of amounts included in net income | (231 | ) |  | 4,442 |  |  | 4,211 |
Net other comprehensive income (loss) during period | 329,407 |  |  | 1,563 |  |  | 330,970 |
Balance December 31, 2019 | $ | 313,304 |  |  | $ | (45,934 | ) |  | $ | 267,370 |
Balance January 1, 2018 | $ | 117,230 |  |  | $ | (37,718 | ) |  | $ | 79,512 |
Other comprehensive income (loss) before reclassification | (151,013 | ) |  | (5,708 | ) |  | (156,721 | )
Reclassification of amounts included in net income | 123 |  |  | 3,951 |  |  | 4,074 |
Net other comprehensive income (loss) during period | (150,890 | ) |  | (1,757 | ) |  | (152,647 | )
Reclassification of certain income tax effects related to the change in the U.S. statutory federal income tax rate under the Tax Cuts and Jobs Act to retained earnings | 17,557 |  |  | (8,022 | ) |  | 9,535 |
Balance December 31, 2018 | $ | (16,103 | ) |  | $ | (47,497 | ) |  | $ | (63,600 | )
Balance January 1, 2017 | $ | 16,153 |  |  | $ | (40,776 | ) |  | $ | (24,623 | )
Other comprehensive income (loss) before reclassification | 97,865 |  |  | (471 | ) |  | 97,394 |
Reclassification of amounts included in net income | 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 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e526-108580 + Details
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