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Segment Information - Information about Company's Segments (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Net Income (Loss) $ 493,160 $ 381,053 $ 845,770 $ 729,980
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 1,466,201 1,399,016 2,900,414 2,760,121
Business Banking [Member]        
Segment Reporting Information [Line Items]        
Net Income (Loss) 43,007 28,750 80,725 53,738
Business Banking [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 136,029 124,982 263,913 245,315
Business Banking [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 912 1,006 1,830 1,917
Commercial Banking [Member]        
Segment Reporting Information [Line Items]        
Net Income (Loss) 126,391 105,627 251,856 218,414
Commercial Banking [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 269,499 277,116 535,895 551,024
Commercial Banking [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 928 843 1,778 1,763
Commercial Real Estate [Member]        
Segment Reporting Information [Line Items]        
Net Income (Loss) 112,691 87,271 220,994 171,818
Commercial Real Estate [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 205,541 197,298 408,148 392,423
Commercial Real Estate [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 385 357 725 764
Discretionary Portfolio [Member]        
Segment Reporting Information [Line Items]        
Net Income (Loss) 29,113 29,740 48,852 63,685
Discretionary Portfolio [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 58,976 72,044 109,014 150,990
Discretionary Portfolio [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]        
Segment Reporting Information [Line Items]        
Total Revenues (10,554) (12,397) (21,386) (25,324)
Residential Mortgage Banking [Member]        
Segment Reporting Information [Line Items]        
Net Income (Loss) 15,402 13,742 30,348 23,660
Residential Mortgage Banking [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 82,167 88,700 164,625 174,102
Residential Mortgage Banking [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 16,047 18,144 31,468 36,355
Retail Banking [Member]        
Segment Reporting Information [Line Items]        
Net Income (Loss) 143,089 100,094 266,469 186,285
Retail Banking [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 420,540 383,904 814,016 752,422
Retail Banking [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 2,707 3,045 5,572 6,092
All Other [Member]        
Segment Reporting Information [Line Items]        
Net Income (Loss) 23,467 15,829 (53,474) 12,380
All Other [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 293,449 254,972 604,803 493,845
All Other [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]        
Segment Reporting Information [Line Items]        
Total Revenues $ (10,425) $ (10,998) $ (19,987) $ (21,567)