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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)