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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2022
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 |  | Investment Securities Transferred from AFS |  | Employee Benefit Plans |  |  |  | Total
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 loss, before income taxes |  | (143,548) |  |  | — |  |  | — |  |  |  |  | (143,548) |
Federal and state income taxes |  | (34,448) |  |  | — |  |  | — |  |  |  |  | (34,448) |
Other comprehensive loss, net of income taxes |  | (109,100) |  |  | — |  |  | — |  |  |  |  | (109,100) |
Balance, June 30, 2021 |  | $ | 225,932 |  |  | $ | — |  |  | $ | 836 |  |  |  |  | $ | 226,768 |
Balance, Dec. 31, 2021 |  | $ | 69,775 |  |  | $ | — |  |  | $ | 2,596 |  |  |  |  | $ | 72,371 |
Net change in unrealized gain (loss) |  | (881,577) |  |  | — |  |  | — |  |  |  |  | (881,577) |
Transfer of net unrealized loss from AFS to investment securities |  | 267,509 |  |  | (267,509) |  |  | — |  |  |  |  | — |
Reclassification adjustments included in earnings: |  |  |  |  |  |  |  |  |  |
Interest revenue, Investment securities |  | — |  |  | 2,455 |  |  | — |  |  |  |  | 2,455 |
Gain on available for sale securities, net |  | (2,125) |  |  | — |  |  | — |  |  |  |  | (2,125) |
Other comprehensive loss, before income taxes |  | (616,193) |  |  | (265,054) |  |  | — |  |  |  |  | (881,247) |
Federal and state income taxes |  | (144,215) |  |  | (62,033) |  |  | — |  |  |  |  | (206,248) |
Other comprehensive loss, net of income taxes |  | (471,978) |  |  | (203,021) |  |  | — |  |  |  |  | (674,999) |
Balance, June 30, 2022 |  | $ | (402,203) |  |  | $ | (203,021) |  |  | $ | 2,596 |  |  |  |  | $ | (602,628) |

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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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