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Shareholders' Equity Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 72,371 | $ 335,868 | $ 104,923
Net change in unrealized gain (loss) | (1,227,414) | (341,369) | 313,796
Transfer of net unrealized loss from AFS to investment securities | 0 |  |
Reclassification adjustments included in earnings: [Abstract] |  |  |
Interest revenue, Investment securities | 42,514 | 0 | 0
Operating expense, Personnel | (3,483) | 0 | 0
Loss (gain) on available for sale securities, net | 971 | (3,704) | (9,910)
Other comprehensive income (loss), before income taxes | (1,187,412) | (345,073) | 303,886
Federal and state income taxes | (278,086) | (81,576) | 72,941
Other comprehensive income (loss), net of income taxes | (909,326) | (263,497) | 230,945
Ending balance | (836,955) | 72,371 | 335,868
Unrealized Gain (Loss) on Available for Sale Securities [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 69,775 | 335,032 | 104,996
Net change in unrealized gain (loss) | (1,227,414) | (343,730) | 312,576
Transfer of net unrealized loss from AFS to investment securities | 267,509 |  |
Reclassification adjustments included in earnings: [Abstract] |  |  |
Interest revenue, Investment securities | 0 |  |
Operating expense, Personnel | 0 |  |
Loss (gain) on available for sale securities, net | 971 | (3,704) | (9,910)
Other comprehensive income (loss), before income taxes | (958,934) | (347,434) | 302,666
Federal and state income taxes | (224,541) | (82,177) | 72,630
Other comprehensive income (loss), net of income taxes | (734,393) | (265,257) | 230,036
Ending balance | (664,618) | 69,775 | 335,032
Accumulated Unrealized Gain/Loss on Investment Securities Transferred from AFS |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 0 | 0 | 0
Net change in unrealized gain (loss) | 0 | 0 | 0
Transfer of net unrealized loss from AFS to investment securities | (267,509) |  |
Reclassification adjustments included in earnings: [Abstract] |  |  |
Interest revenue, Investment securities | 42,514 |  |
Operating expense, Personnel | 0 |  |
Loss (gain) on available for sale securities, net | 0 | 0 | 0
Other comprehensive income (loss), before income taxes | (224,995) | 0 | 0
Federal and state income taxes | (52,658) | 0 | 0
Other comprehensive income (loss), net of income taxes | (172,337) | 0 | 0
Ending balance | (172,337) | 0 | 0
Unrealized Gain (Loss) on Employee Benefit Plans [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 2,596 | 836 | (73)
Net change in unrealized gain (loss) | 0 | 2,361 | 1,220
Transfer of net unrealized loss from AFS to investment securities | 0 |  |
Reclassification adjustments included in earnings: [Abstract] |  |  |
Interest revenue, Investment securities | 0 |  |
Operating expense, Personnel | (3,483) |  |
Loss (gain) on available for sale securities, net | 0 | 0 | 0
Other comprehensive income (loss), before income taxes | (3,483) | 2,361 | 1,220
Federal and state income taxes | (887) | 601 | 311
Other comprehensive income (loss), net of income taxes | (2,596) | 1,760 | 909
Ending balance | $ 0 | $ 2,596 | $ 836

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e681-108580 + Details
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