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Segment Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Net interest income $ 327,866 $ 292,768  
Provision for (recovery of) losses (176) 7  
Non-Interest Income [1] 35,237 52,234  
Non-interest expense [2] 158,448 156,836  
Income before income taxes 204,831 188,159  
Income tax (benefit) expense 74,922 68,900  
Net (loss) income 129,909 119,259  
Identifiable segment assets (period-end) 48,515,572 48,251,715 $ 50,317,796
Operating Segments      
Segment Reporting Information [Line Items]      
Non-Interest Income 35,237 52,234  
Banking Operations      
Segment Reporting Information [Line Items]      
Net interest income 324,917 289,285  
Provision for (recovery of) losses (176) 7  
Non-Interest Income [1] 30,586 33,154  
Non-interest expense [2] 142,050 140,151  
Income before income taxes 209,517 178,111  
Income tax (benefit) expense 76,815 64,890  
Net (loss) income 132,702 113,221  
Identifiable segment assets (period-end) 47,739,937 47,573,020  
Banking Operations | Inter-segment      
Segment Reporting Information [Line Items]      
Non-Interest Income (4,112) (4,170)  
Banking Operations | Operating Segments      
Segment Reporting Information [Line Items]      
Non-Interest Income 26,474 28,984  
Residential Mortgage Banking      
Segment Reporting Information [Line Items]      
Net interest income 2,949 3,483  
Non-Interest Income [1] 4,651 19,080  
Non-interest expense [2] 16,398 16,685  
Income before income taxes (4,686) 10,048  
Income tax (benefit) expense (1,893) 4,010  
Net (loss) income (2,793) 6,038  
Identifiable segment assets (period-end) 775,635 678,695  
Residential Mortgage Banking | Inter-segment      
Segment Reporting Information [Line Items]      
Non-Interest Income 4,112 4,170  
Residential Mortgage Banking | Operating Segments      
Segment Reporting Information [Line Items]      
Non-Interest Income $ 8,763 $ 23,250  
[1] Includes ancillary fee income.
[2] Includes both direct and indirect expenses.