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Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2016
Equity [Abstract] |
Other Comprehensive Income (Loss) | Other Comprehensive Income (Loss) The before and after tax amounts allocated to each component of other comprehensive income (loss) are presented in the following table. Reclassification adjustments related to securities available for sale are included in net gain (loss) on securities transactions in the accompanying consolidated statements of income. The change in the net actuarial gain/loss on defined-benefit post-retirement benefit plans is included in the computation of net periodic pension expense (see Note 12 – Defined Benefit Plans).
| Three Months Ended September 30, 2016 |  | Three Months Ended September 30, 2015
| Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount |  | Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | (95,641 | ) |  | $ | (33,473 | ) |  | $ | (62,168 | ) |  | $ | 86,445 |  |  | $ | 30,256 |  |  | $ | 56,189 |
Change in net unrealized gain on securities transferred to held to maturity | (7,278 | ) |  | (2,547 | ) |  | (4,731 | ) |  | (8,831 | ) |  | (3,091 | ) |  | (5,740 | )
Reclassification adjustment for net (gains) losses included in net income | 37 |  |  | 12 |  |  | 25 |  |  | 52 |  |  | 18 |  |  | 34 |
Total securities available for sale and transferred securities | (102,882 | ) |  | (36,008 | ) |  | (66,874 | ) |  | 77,666 |  |  | 27,183 |  |  | 50,483 |
Defined-benefit post-retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |
Change in the net actuarial gain/loss | 1,585 |  |  | 555 |  |  | 1,030 |  |  | 1,748 |  |  | 612 |  |  | 1,136 |
Remeasurement of projected benefit obligation related to SERP | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Reclassification adjustment for SERP settlement costs included in net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total defined-benefit post-retirement benefit plans | 1,585 |  |  | 555 |  |  | 1,030 |  |  | 1,748 |  |  | 612 |  |  | 1,136 |
Total other comprehensive income (loss) | $ | (101,297 | ) |  | $ | (35,453 | ) |  | $ | (65,844 | ) |  | $ | 79,414 |  |  | $ | 27,795 |  |  | $ | 51,619 |
| Nine Months Ended September 30, 2016 |  | Nine Months Ended September 30, 2015
| Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount |  | Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | 191,865 |  |  | $ | 67,154 |  |  | $ | 124,711 |  |  | $ | 7,704 |  |  | $ | 2,697 |  |  | $ | 5,007 |
Change in net unrealized gain on securities transferred to held to maturity | (24,629 | ) |  | (8,620 | ) |  | (16,009 | ) |  | (24,925 | ) |  | (8,724 | ) |  | (16,201 | )
Reclassification adjustment for net (gains) losses included in net income | (14,866 | ) |  | (5,204 | ) |  | (9,662 | ) |  | (176 | ) |  | (62 | ) |  | (114 | )
Total securities available for sale and transferred securities | 152,370 |  |  | 53,330 |  |  | 99,040 |  |  | (17,397 | ) |  | (6,089 | ) |  | (11,308 | )
Defined-benefit post-retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |
Change in the net actuarial gain/loss | 4,691 |  |  | 1,642 |  |  | 3,049 |  |  | 5,246 |  |  | 1,836 |  |  | 3,410 |
Remeasurement of projected benefit obligation related to SERP | (862 | ) |  | (302 | ) |  | (560 | ) |  | — |  |  | — |  |  | — |
Reclassification adjustment for SERP settlement costs included in net income | 187 |  |  | 66 |  |  | 121 |  |  | — |  |  | — |  |  | — |
Total defined-benefit post-retirement benefit plans | 4,016 |  |  | 1,406 |  |  | 2,610 |  |  | 5,246 |  |  | 1,836 |  |  | 3,410 |
Total other comprehensive income (loss) | $ | 156,386 |  |  | $ | 54,736 |  |  | $ | 101,650 |  |  | $ | (12,151 | ) |  | $ | (4,253 | ) |  | $ | (7,898 | )
Activity in accumulated other comprehensive income (loss), net of tax, was as follows:
| Securities Available For Sale |  | Defined Benefit Plans |  | Accumulated Other Comprehensive Income
Balance January 1, 2016 | $ | 160,611 |  |  | $ | (46,748 | ) |  | $ | 113,863 |
Other comprehensive income (loss) before reclassifications | 108,702 |  |  | 2,489 |  |  | 111,191 |
Amounts reclassified from accumulated other comprehensive income (loss) | (9,662 | ) |  | 121 |  |  | (9,541 | )
Net other comprehensive income (loss) during period | 99,040 |  |  | 2,610 |  |  | 101,650 |
Balance at September 30, 2016 | $ | 259,651 |  |  | $ | (44,138 | ) |  | $ | 215,513 |
Balance January 1, 2015 | $ | 190,589 |  |  | $ | (48,775 | ) |  | $ | 141,814 |
Other comprehensive income (loss) before reclassifications | (11,194 | ) |  | 3,410 |  |  | (7,784 | )
Amounts reclassified from accumulated other comprehensive income (loss) | (114 | ) |  | — |  |  | (114 | )
Net other comprehensive income (loss) during period | (11,308 | ) |  | 3,410 |  |  | (7,898 | )
Balance at September 30, 2015 | $ | 179,281 |  |  | $ | (45,365 | ) |  | $ | 133,916 |

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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