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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
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, 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 taxes 1 |  | (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 | )
Balance, December 31, 2018 |  | $ | (70,999 | ) |  | $ | (1,586 | ) |  | $ | (72,585 | )
Net change in unrealized gain (loss) |  | 228,156 |  |  | — |  |  | 228,156 |
Reclassification adjustments included in earnings: |  |  |  |  |  |
Gain on available for sale securities, net |  | (1,105 | ) |  | — |  |  | (1,105 | )
Other comprehensive income (loss), before income taxes |  | 227,051 |  |  | — |  |  | 227,051 |
Federal and state income taxes 1 |  | 55,897 |  |  | — |  |  | 55,897 |
Other comprehensive income (loss), net of income taxes |  | 171,154 |  |  | — |  |  | 171,154 |
Balance, June 30, 2019 |  | $ | 100,155 |  |  | $ | (1,586 | ) |  | $ | 98,569 |
1 | 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=118930883&loc=SL7669686-108580 + Details
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- References No definition available. + Details
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