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Note Other comprehensive income (loss) (Reclassification out of accumulated other comprehensive income (loss)) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification out of accumulated other comprehensive loss      
Personnel costs $ (562,988) $ (476,762) $ (477,395)
Net (loss) gain and valuation adjustments on debt securities 0 83 38
Other-than-temporary impairment losses on available-for-sale securities 0 8,299 209
Mortgage banking activities 52,802 25,496 56,538
Income tax (benefit) expense (119,579) (230,830) (78,784)
Net Income 618,158 107,681 216,691
Reclassification out of accumulated other comprehensive income      
Reclassification out of accumulated other comprehensive loss      
Net Income (10,348) (18,991) (12,816)
Reclassification out of accumulated other comprehensive income | Adjustment of pension and postretirement benefit plan      
Reclassification out of accumulated other comprehensive loss      
Total before tax (18,072) (18,628) (18,148)
Income tax (benefit) expense 7,047 7,262 7,080
Net Income (11,025) (11,366) (11,068)
Reclassification out of accumulated other comprehensive income | Adjustment of pension and postretirement benefit plan | Amortization of net losses      
Reclassification out of accumulated other comprehensive loss      
Personnel costs (21,542) (22,428) (21,948)
Reclassification out of accumulated other comprehensive income | Adjustment of pension and postretirement benefit plan | Amortization of prior service credit      
Reclassification out of accumulated other comprehensive loss      
Personnel costs 3,470 3,800 3,800
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) on debt securities      
Reclassification out of accumulated other comprehensive loss      
Total before tax 0 (8,216) (171)
Income tax (benefit) expense 0 1,542 34
Net Income 0 (6,674) (137)
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) on debt securities | Realized gain (loss) on sale of securities      
Reclassification out of accumulated other comprehensive loss      
Net (loss) gain and valuation adjustments on debt securities 0 83 38
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) on debt securities | Other-than-temporary impairment      
Reclassification out of accumulated other comprehensive loss      
Other-than-temporary impairment losses on available-for-sale securities 0 (8,299) (209)
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) on equity securities      
Reclassification out of accumulated other comprehensive loss      
Total before tax 0 251 341
Income tax (benefit) expense 0 (50) (31)
Net Income 0 201 310
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) on equity securities | Realized gain on sale of equity securities      
Reclassification out of accumulated other comprehensive loss      
Net gain on equity securities 0 251 341
Reclassification out of accumulated other comprehensive income | Unrealized net (losses) gains on cash flow hedges      
Reclassification out of accumulated other comprehensive loss      
Total before tax 1,110 (1,888) (3,149)
Income tax (benefit) expense (433) 736 1,228
Net Income 677 (1,152) (1,921)
Reclassification out of accumulated other comprehensive income | Unrealized net (losses) gains on cash flow hedges | Forward contracts      
Reclassification out of accumulated other comprehensive loss      
Mortgage banking activities $ 1,110 $ (1,888) $ (3,149)