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Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Other Comprehensive Income (Loss) | 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 | )
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 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 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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Data Type: | nonnum:textBlockItemType
Balance Type: | na
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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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