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Comprehensive Income (Loss) - Schedule of Components of Comprehensive Income-Gross and Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |  |  |
Net income (loss), Gross | $ (80,098) | $ 74,157 | $ 22,468 | $ 188,916
Unrealized holding gains (losses) during the period, Gross | (8,347) | (60,681) | (23,907) | 5,244
Unrealized gains (losses) on securities with credit loss recognized in earnings, Gross | (3,705) | (6,030) | (6,837) | 16,401
Amounts reclassified into net income (loss): net realized (gains) losses on disposals and intent-to-sell AFS securities, Gross | 43 | 9,383 | (35) | 15,487
Amounts reclassified into net income (loss): Credit loss (benefit) expense, Gross | 1,233 | (864) | 3,883 | (10,393)
Total unrealized gains (losses) on investment securities, Gross | (10,776) | (58,192) | (26,896) | 26,739
Amount reclassified into net income (loss): Net actuarial (gain) loss, Gross | 967 | 757 | 1,934 | 1,514
Total defined benefit pension and post-retirement plans, Gross | 967 | 757 | 1,934 | 1,514
Other comprehensive income (loss), Gross | (9,809) | (57,435) | (24,962) | 28,253
Comprehensive income (loss), Gross | (89,907) | 16,722 | (2,494) | 217,169
Net income (loss), Tax | (16,779) | 15,549 | 3,269 | 37,734
Unrealized holding gains (losses) during the period, Tax | (1,753) | (12,744) | (5,020) | 1,102
Unrealized gains (losses) on securities with credit loss recognized in earnings, Tax | (778) | (1,266) | (1,436) | 3,444
Amounts reclassified into net income (loss): net realized (gains) losses on disposals and intent-to-sell AFS securities, Tax | 10 | 1,970 | (7) | 3,252
Amounts reclassified into net income (loss): Credit loss (benefit) expense, Tax | 258 | (181) | 815 | (2,183)
Total unrealized gains (losses) on investment securities, Tax | (2,263) | (12,221) | (5,648) | 5,615
Amount reclassified into net income (loss): Net actuarial (gain) loss, Tax | 203 | 159 | 406 | 318
Total defined benefit pension and post-retirement plans, Tax | 203 | 159 | 406 | 318
Other comprehensive income (loss), Tax | (2,060) | (12,062) | (5,242) | 5,933
Comprehensive income (loss), Tax | (18,839) | 3,487 | (1,973) | 43,667
Net income (loss) | (63,319) | 58,608 | 19,199 | 151,182
Unrealized holding gains (losses) during the period, Net | (6,594) | (47,937) | (18,887) | 4,142
Unrealized gains (losses) on securities with credit loss recognized in earnings, Net | (2,927) | (4,764) | (5,401) | 12,957
Amounts reclassified into net income (loss): net realized (gains) losses on disposals and intent-to-sell AFS securities, Net | 33 | 7,413 | (28) | 12,235
Amounts reclassified into net income (loss): Credit loss (benefit) expense, Net | 975 | (683) | 3,068 | (8,210)
Total unrealized gains (losses) on investment securities | (8,513) | (45,971) | (21,248) | 21,124
Amount reclassified into net income (loss): Net actuarial (gain) loss, Net | 764 | 598 | 1,528 | 1,196
Total defined benefit pension and post-retirement plans | 764 | 598 | 1,528 | 1,196
Other comprehensive income (loss) | (7,749) | (45,373) | (19,720) | 22,320
Comprehensive income (loss) | $ (71,068) | $ 13,235 | $ (521) | $ 173,502

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- Definition Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 12 -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-12 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration