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Segment Results (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Net interest income $ 287,769 $ 325,573 $ 582,686 $ 653,439  
Provision (Recovery) of loan losses (6,261) 895 (10,269) 719  
Non-interest income [1] 50,437 37,366 82,609 72,603  
Non-interest expense [2] 163,765 160,911 330,708 319,359  
Income before income taxes 180,702 201,133 344,856 405,964  
Income tax expense (benefit) 65,447 74,673 125,644 149,595  
Net income (loss) 115,255 126,460 219,212 256,369  
Identifiable segment assets (period-end) 48,347,658 49,035,747 48,347,658 49,035,747 $ 48,926,555
Operating Segments          
Segment Reporting Information [Line Items]          
Non-interest income 50,437 37,366 82,609 72,603  
Banking Operations          
Segment Reporting Information [Line Items]          
Net interest income 284,944 321,663 577,221 646,580  
Provision (Recovery) of loan losses (6,261) 895 (10,269) 719  
Non-interest income [1] 41,756 29,899 63,625 60,485  
Non-interest expense [2] 148,105 144,152 299,041 286,202  
Income before income taxes 180,804 202,198 344,263 411,715  
Income tax expense (benefit) 65,488 75,097 125,408 151,912  
Net income (loss) 115,316 127,101 218,855 259,803  
Identifiable segment assets (period-end) 47,770,885 48,137,359 47,770,885 48,137,359  
Banking Operations | Inter-segment          
Segment Reporting Information [Line Items]          
Non-interest income (4,052) (4,317) (7,811) (8,429)  
Banking Operations | Operating Segments          
Segment Reporting Information [Line Items]          
Non-interest income 37,704 25,582 55,814 52,056  
Residential Mortgage Banking          
Segment Reporting Information [Line Items]          
Net interest income 2,825 3,910 5,465 6,859  
Non-interest income [1] 8,681 7,467 18,984 12,118  
Non-interest expense [2] 15,660 16,759 31,667 33,157  
Income before income taxes (102) (1,065) 593 (5,751)  
Income tax expense (benefit) (41) (424) 236 (2,317)  
Net income (loss) (61) (641) 357 (3,434)  
Identifiable segment assets (period-end) 576,773 898,388 576,773 898,388  
Residential Mortgage Banking | Inter-segment          
Segment Reporting Information [Line Items]          
Non-interest income 4,052 4,317 7,811 8,429  
Residential Mortgage Banking | Operating Segments          
Segment Reporting Information [Line Items]          
Non-interest income $ 12,733 $ 11,784 $ 26,795 $ 20,547  
[1] Includes ancillary fee income.
[2] Includes both direct and indirect expenses.