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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 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) |  | 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 |  | 82,167 |  |  | — |  |  |  |  | 82,167 |
Other comprehensive income, net of income taxes |  | 260,247 |  |  | — |  |  |  |  | 260,247 |
Balance, September 30, 2020 |  | $ | 365,243 |  |  | $ | (73) |  |  |  |  | $ | 365,170 |
Balance, Dec. 31, 2020 |  | $ | 335,032 |  |  | $ | 836 |  |  |  |  | $ | 335,868 |
Net change in unrealized gain (loss) |  | (216,176) |  |  | — |  |  |  |  | (216,176) |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |
Gain on available for sale securities, net |  | (3,152) |  |  | — |  |  |  |  | (3,152) |
Other comprehensive income, before income taxes |  | (219,328) |  |  | — |  |  |  |  | (219,328) |
Federal and state income taxes |  | (52,632) |  |  | — |  |  |  |  | (52,632) |
Other comprehensive income (loss), net of income taxes |  | (166,696) |  |  | — |  |  |  |  | (166,696) |
Balance, September 30, 2021 |  | $ | 168,336 |  |  | $ | 836 |  |  |  |  | $ | 169,172 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: 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=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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