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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2020
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, Dec. 31, 2018 |  | $ | (70,999) |  |  | $ | (1,586) |  |  |  |  | $ | (72,585) |
Net change in unrealized gain (loss) |  | 274,441 |  |  | — |  |  |  |  | 274,441 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |
Gain on available for sale securities, net |  | (1,110) |  |  | — |  |  |  |  | (1,110) |
Other comprehensive income, before income taxes |  | 273,331 |  |  | — |  |  |  |  | 273,331 |
Federal and state income taxes 1 |  | 66,993 |  |  | — |  |  |  |  | 66,993 |
Other comprehensive income, net of income taxes |  | 206,338 |  |  | — |  |  |  |  | 206,338 |
Balance, September 30, 2019 |  | $ | 135,339 |  |  | $ | (1,586) |  |  |  |  | $ | 133,753 |
Balance, Dec. 31, 2019 |  | $ | 104,996 |  |  | $ | (73) |  |  |  |  | $ | 104,923 |
Net change in unrealized gain (loss) |  | 347,985 |  |  | — |  |  |  |  | 347,985 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |
Gain on available for sale securities, net |  | (5,571) |  |  | — |  |  |  |  | (5,571) |
Other comprehensive income, before income taxes |  | 342,414 |  |  | — |  |  |  |  | 342,414 |
Federal and state income taxes 1 |  | 82,167 |  |  | — |  |  |  |  | 82,167 |
Other comprehensive income, net of income taxes |  | 260,247 |  |  | — |  |  |  |  | 260,247 |
Balance, September 30, 2020 |  | $ | 365,243 |  |  | $ | (73) |  |  |  |  | $ | 365,170 |
1 Calculated using a 25 percent blended federal and state statutory tax rate.

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