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Segment Information - Information about Company's Segments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Net Income (Loss) $ 352,610 $ 348,927
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 1,434,213 1,361,105
Business Banking [Member]    
Segment Reporting Information [Line Items]    
Net Income (Loss) 37,718 24,988
Business Banking [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 127,884 120,333
Business Banking [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 918 911
Commercial Banking [Member]    
Segment Reporting Information [Line Items]    
Net Income (Loss) 125,465 112,787
Commercial Banking [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 266,396 273,908
Commercial Banking [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 850 920
Commercial Real Estate [Member]    
Segment Reporting Information [Line Items]    
Net Income (Loss) 108,303 84,547
Commercial Real Estate [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 202,607 195,125
Commercial Real Estate [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 340 407
Discretionary Portfolio [Member]    
Segment Reporting Information [Line Items]    
Net Income (Loss) 19,739 33,945
Discretionary Portfolio [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 50,038 78,946
Discretionary Portfolio [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]    
Segment Reporting Information [Line Items]    
Total Revenues (10,832) (12,927)
Residential Mortgage Banking [Member]    
Segment Reporting Information [Line Items]    
Net Income (Loss) 14,946 9,917
Residential Mortgage Banking [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 82,458 85,401
Residential Mortgage Banking [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 15,421 18,211
Retail Banking [Member]    
Segment Reporting Information [Line Items]    
Net Income (Loss) 123,380 86,191
Retail Banking [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 393,476 368,518
Retail Banking [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 2,865 3,047
All Other [Member]    
Segment Reporting Information [Line Items]    
Net Income (Loss) (76,941) (3,448)
All Other [Member] | Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 311,354 238,874
All Other [Member] | Intersegment Activity Eliminated in Consolidated Totals [Member]    
Segment Reporting Information [Line Items]    
Total Revenues $ (9,562) $ (10,569)