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Comprehensive Income - Components of Comprehensive Income-Gross and Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |
Net income, Gross | $ 102,566 | $ 114,759
Unrealized holding gains (losses) during the period, Gross | (15,560) | 65,925
Unrealized gains (losses) on securities with credit loss recognized in earnings, Gross | (3,132) | 22,431
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, Gross | (78) | 6,104
Amounts reclassified into net income: Credit loss (benefit) expense, Gross | 2,650 | (9,529)
Total unrealized gains (losses) on investment securities, Gross | (16,120) | 84,931
Amount reclassified into net income: Net actuarial (gain) loss, Gross | 967 | 757
Total defined benefit pension and post-retirement plans, Gross | 967 | 757
Other comprehensive income (loss), Gross | (15,153) | 85,688
Comprehensive income (loss), Gross | 87,413 | 200,447
Net income, Tax | 20,048 | 22,185
Unrealized holding gains (losses) during the period, Tax | (3,267) | 13,846
Unrealized gains (losses) on securities with credit loss recognized in earnings, Tax | (658) | 4,710
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, Tax | (17) | 1,282
Amounts reclassified into net income: Credit loss (benefit) expense, Tax | 557 | (2,002)
Total unrealized gains (losses) on investment securities, Tax | (3,385) | 17,836
Amount reclassified into net income: Net actuarial (gain) loss, Tax | 203 | 159
Total defined benefit pension and post-retirement plans, Tax | 203 | 159
Other comprehensive income (loss), Tax | (3,182) | 17,995
Comprehensive income (loss), Tax | 16,866 | 40,180
Net income | 82,518 | 92,574
Unrealized holding gains (losses) during the period, Net | (12,293) | 52,079
Unrealized gains (losses) on securities with credit loss recognized in earnings, Net | (2,474) | 17,721
Amounts reclassified into net income: net realized (gains) losses on disposals and intent-to-sell AFS securities, Net | (61) | 4,822
Amounts reclassified into net income: Credit loss (benefit) expense, Net | 2,093 | (7,527)
Total unrealized gains (losses) on investment securities | (12,735) | 67,095
Amount reclassified into net income: Net actuarial (gain) loss, Net | 764 | 598
Total defined benefit pension and post-retirement plans | 764 | 598
Other comprehensive income (loss) | (11,971) | 67,693
Comprehensive income (loss) | $ 70,547 | $ 160,267

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