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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2019 |  | $ | 104,996 |  |  | $ | (73) |  |  |  |  | $ | 104,923 |
Net change in unrealized gain (loss) |  | 354,765 |  |  | — |  |  |  |  | 354,765 |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |
Gain on available for sale securities, net |  | (5,583) |  |  | — |  |  |  |  | (5,583) |
Other comprehensive income, before income taxes |  | 349,182 |  |  | — |  |  |  |  | 349,182 |
Federal and state income taxes |  | 83,789 |  |  | — |  |  |  |  | 83,789 |
Other comprehensive income, net of income taxes |  | 265,393 |  |  | — |  |  |  |  | 265,393 |
Balance, June 30, 2020 |  | $ | 370,389 |  |  | $ | (73) |  |  |  |  | $ | 370,316 |
Balance, Dec. 31, 2020 |  | $ | 335,032 |  |  | $ | 836 |  |  |  |  | $ | 335,868 |
Net change in unrealized gain (loss) |  | (141,651) |  |  | — |  |  |  |  | (141,651) |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |
Gain on available for sale securities, net |  | (1,897) |  |  | — |  |  |  |  | (1,897) |
Other comprehensive income, before income taxes |  | (143,548) |  |  | — |  |  |  |  | (143,548) |
Federal and state income taxes |  | (34,448) |  |  | — |  |  |  |  | (34,448) |
Other comprehensive income (loss), net of income taxes |  | (109,100) |  |  | — |  |  |  |  | (109,100) |
Balance, June 30, 2021 |  | $ | 225,932 |  |  | $ | 836 |  |  |  |  | $ | 226,768 |

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