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Note Other comprehensive income (loss) (Reclassification out of accumulated other comprehensive income (loss)) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Personnel costs $ (139,757) $ (117,769) $ (389,941) $ (358,457)
Debt Securities Realized Gain Loss 0 83 0 83
Other-than-temporary impairment losses on available-for-sale debt securities 0 0 0 (8,299)
Mortgage banking activities 11,269 5,239 33,408 27,349
Income tax (benefit) expense (42,018) 19,966 (35,613) (48,772)
Net Income 140,648 20,664 511,755 209,835
Reclassification out of accumulated other comprehensive income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net Income (2,845) (2,901) (7,738) (16,331)
Reclassification out of accumulated other comprehensive income | Adjustment of pension and postretirement benefit plan        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Total before tax (4,518) (4,656) (13,554) (13,969)
Income tax (benefit) expense 1,762 1,815 5,285 5,446
Net Income (2,756) (2,841) (8,269) (8,523)
Reclassification out of accumulated other comprehensive income | Adjustment of pension and postretirement benefit plan | Amortization of net losses        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Personnel costs (5,386) (5,606) (16,157) (16,819)
Reclassification out of accumulated other comprehensive income | Adjustment of pension and postretirement benefit plan | Amortization of prior service credit        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Personnel costs 868 950 2,603 2,850
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) on debt securities        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Total before tax 0 83 0 (8,216)
Income tax (benefit) expense 0 (17) 0 1,542
Net Income 0 66 0 (6,674)
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) on debt securities | Realized gain (loss) on sale of securities        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Debt Securities Realized Gain Loss 0 83 0 83
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) on debt securities | Other-than-temporary impairment        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Other-than-temporary impairment losses on available-for-sale debt securities 0 0 0 (8,299)
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) on equity securities        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Total before tax 0 20 0 201
Income tax (benefit) expense 0 (4) 0 (40)
Net Income 0 16 0 161
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) on equity securities | Realized gain on sale of equity securities        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Net gain on equity securities 0 20 0 201
Reclassification out of accumulated other comprehensive income | Unrealized net (losses) gains on cash flow hedges        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Total before tax (147) (232) 870 (2,122)
Income tax (benefit) expense 58 90 (339) 827
Net Income (89) (142) 531 (1,295)
Reclassification out of accumulated other comprehensive income | Unrealized net (losses) gains on cash flow hedges | Forward contracts for ASR        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Mortgage banking activities $ (147) $ (232) $ 870 $ (2,122)