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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 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) |  | 33,369 |  |  | — |  |  | 33,369 |
Reclassification adjustments included in earnings: |  |  |  |  |  |
Gain on available for sale securities, net |  | (2,429 | ) |  | — |  |  | (2,429 | )
Other comprehensive income (loss), before income taxes |  | 30,940 |  |  | — |  |  | 30,940 |
Federal and state income taxes1 |  | 12,009 |  |  | — |  |  | 12,009 |
Other comprehensive income (loss), net of income taxes |  | 18,931 |  |  | — |  |  | 18,931 |
Balance, June 30, 2017 |  | $ | 9,844 |  |  | $ | (1,880 | ) |  | $ | 7,964 |
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) |  | (130,523 | ) |  | — |  |  | (130,523 | )
Reclassification adjustments included in earnings: |  |  |  |  |  |
Loss on available for sale securities, net |  | 1,052 |  |  | — |  |  | 1,052 |
Other comprehensive income (loss), before income taxes |  | (129,471 | ) |  | — |  |  | (129,471 | )
Federal and state income taxes2 |  | (33,049 | ) |  | — |  |  | (33,049 | )
Other comprehensive income (loss), net of income taxes |  | (96,422 | ) |  | — |  |  | (96,422 | )
Balance, June 30, 2018 |  | $ | (134,516 | ) |  | $ | (789 | ) |  | $ | (135,305 | )
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- References No definition available. + Details
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