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Accumulated Other Comprehensive Income (Loss) - Reclassifications out of AOCI (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Debt securities (gains) losses, net | $ (1,993) | $ (5,174)
Income tax (expense) benefit | 17,630 | 2,939
Interest income (expense) | (148,120) | (143,771)
Salaries and employee benefits | 68,117 | 79,173
Net income | (86,818) | (22,640)
Amount Reclassified from AOCI |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net income | 1,628 | 4,305
Amount Reclassified from AOCI | Unrealized Gains and Losses on Available- for-Sale Debt Securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Debt securities (gains) losses, net | 1,993 | 5,174
Income tax (expense) benefit | (440) | (1,174)
Net income | 1,553 | 4,000
Amount Reclassified from AOCI | Gains and Losses on Cash Flow Hedges | Interest rate contracts |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income tax (expense) benefit | (37) | (106)
Interest income (expense) | 149 | 431
Net income | 112 | 325
Amount Reclassified from AOCI | Defined Benefit Pension Plans |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income tax (expense) benefit | 12 | 7
Salaries and employee benefits | (49) | (27)
Net income | $ (37) | $ (20)

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