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Revenue from Contracts with Customers - Summary of Sources of Noninterest Income that are Subject to Noted Accounting Guidance (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation Of Revenue [Line Items]        
Brokerage services income $ 12,077 $ 12,267 $ 37,031 $ 38,288
Other revenues from operations:        
Total other income 527,779 459,294 1,540,639 1,375,404
Service Charges on Deposit Accounts [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 111,092 108,647 321,991 320,546
Trust Income [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 143,915 133,545 421,083 402,561
ASU 2014-09 [Member]        
Disaggregation Of Revenue [Line Items]        
Brokerage services income 12,077 12,267 37,031 38,288
Other revenues from operations:        
Merchant discount and credit card fees 28,190 27,771 82,016 78,605
Other 20,353 20,906 69,013 68,208
Total other income 315,627 303,136 931,134 908,208
ASU 2014-09 [Member] | Business Banking [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 9,692 9,238 28,469 25,075
Total other income 24,832 25,005 73,905 71,857
ASU 2014-09 [Member] | Commercial Banking [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 13,409 13,520 38,630 38,774
Other 1,239 1,662 5,386 6,871
Total other income 38,317 39,349 114,427 118,736
ASU 2014-09 [Member] | Commercial Real Estate [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 670 643 1,772 1,625
Other 1,372 1,822 5,840 4,896
Total other income 4,457 4,839 14,915 14,110
ASU 2014-09 [Member] | Discretionary Portfolio [Member]        
Other revenues from operations:        
Other 503 386 1,545 1,251
Total other income 503 386 1,545 1,251
ASU 2014-09 [Member] | Residential Mortgage Banking [Member]        
Other revenues from operations:        
Other 816 916 2,913 2,886
Total other income 816 918 2,917 2,894
ASU 2014-09 [Member] | Retail Banking [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 4,150 3,908 11,854 11,436
Other 9,347 9,397 27,170 28,875
Total other income 81,952 78,014 234,291 228,636
ASU 2014-09 [Member] | All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Brokerage services income 12,077 12,267 37,031 38,288
Other revenues from operations:        
Merchant discount and credit card fees 269 462 1,291 1,695
Other 7,076 6,723 26,159 23,429
Total other income 164,750 154,625 489,134 470,724
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 111,092 108,647 321,991 320,546
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Business Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 15,131 15,767 45,415 46,782
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Commercial Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 23,427 24,167 69,731 73,091
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Commercial Real Estate [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 2,415 2,374 7,303 7,589
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Residential Mortgage Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer   2 4 8
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Retail Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 68,455 64,709 195,267 188,325
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 1,664 1,628 4,271 4,751
ASU 2014-09 [Member] | Trust Income [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 143,915 133,545 421,083 402,561
ASU 2014-09 [Member] | Trust Income [Member] | Business Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 9   21  
ASU 2014-09 [Member] | Trust Income [Member] | Commercial Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 242   680  
ASU 2014-09 [Member] | Trust Income [Member] | All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer $ 143,664 $ 133,545 $ 420,382 $ 402,561