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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2018
Stockholders' Equity Note [Abstract] |
Accumulated Other Comprehensive Income (Loss) [Table Text Block] | A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
|  | Unrealized Gain (Loss) on |  |
|  | Available for Sale Securities |  | Employee Benefit Plans |  | Total
Balance, December 31, 2016 |  | $ | (9,087 | ) |  | $ | (1,880 | ) |  | $ | (10,967 | )
Net change in unrealized gain (loss) |  | 33,876 |  |  | 5 |  |  | 33,881 |
Reclassification adjustments included in earnings: |  |  |  |  |  |
Gain on available for sale securities, net |  | (4,916 | ) |  | — |  |  | (4,916 | )
Other comprehensive income (loss), before income taxes |  | 28,960 |  |  | 5 |  |  | 28,965 |
Federal and state income taxes1 |  | 11,239 |  |  | 2 |  |  | 11,241 |
Other comprehensive income (loss), net of income taxes |  | 17,721 |  |  | 3 |  |  | 17,724 |
Balance, September 30, 2017 |  | $ | 8,634 |  |  | $ | (1,877 | ) |  | $ | 6,757 |
Balance, December 31, 2017 |  | $ | (35,385 | ) |  | $ | (789 | ) |  | $ | (36,174 | )
Transition adjustment for net unrealized gains on equity securities |  | (2,709 | ) |  | — |  |  | (2,709 | )
Net change in unrealized gain (loss) |  | (166,464 | ) |  | — |  |  | (166,464 | )
Reclassification adjustments included in earnings: |  |  |  |  |  |
Loss on available for sale securities, net |  | 802 |  |  | — |  |  | 802 |
Other comprehensive income (loss), before income taxes |  | (165,662 | ) |  | — |  |  | (165,662 | )
Federal and state income taxes2 |  | (42,183 | ) |  | — |  |  | (42,183 | )
Other comprehensive income (loss), net of income taxes |  | (123,479 | ) |  | — |  |  | (123,479 | )
Balance, September 30, 2018 |  | $ | (161,573 | ) |  | $ | (789 | ) |  | $ | (162,362 | )
1 | Calculated using a 39 percent blended federal and state statutory tax rate.
2 Calculated using a 25 percent blended federal and state statutory tax rate.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- References No definition available. + Details
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