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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation Of Revenue [Line Items]        
Brokerage services income $ 12,478 $ 12,629 $ 24,954 $ 26,021
Other revenues from operations:        
Total other income 512,095 457,414 1,012,860 916,110
Service Charges on Deposit Accounts [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 107,787 106,784 210,899 211,899
Trust Income [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 144,382 137,641 277,168 269,016
ASU 2014-09 [Member]        
Disaggregation Of Revenue [Line Items]        
Brokerage services income 12,478 12,629 24,954 26,021
Other revenues from operations:        
Merchant discount and credit card fees 28,688 26,062 53,826 50,834
Other 25,423 24,412 48,660 47,302
Total other income 318,758 307,528 615,507 605,072
ASU 2014-09 [Member] | Business Banking [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 9,895 8,334 18,777 15,837
Total other income 25,077 23,945 49,073 46,852
ASU 2014-09 [Member] | Commercial Banking [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 13,129 12,542 25,221 25,254
Other 3,145 3,646 4,147 5,209
Total other income 39,592 40,458 76,110 79,387
ASU 2014-09 [Member] | Commercial Real Estate [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 496 428 1,102 982
Other 2,680 2,215 4,468 3,074
Total other income 5,538 5,094 10,458 9,271
ASU 2014-09 [Member] | Discretionary Portfolio [Member]        
Other revenues from operations:        
Other 641 413 1,042 865
Total other income 641 413 1,042 865
ASU 2014-09 [Member] | Residential Mortgage Banking [Member]        
Other revenues from operations:        
Other 1,033 927 2,097 1,970
Total other income 1,035 930 2,101 1,976
ASU 2014-09 [Member] | Retail Banking [Member]        
Other revenues from operations:        
Merchant discount and credit card fees 4,566 4,140 7,704 7,528
Other 9,329 9,613 17,823 19,478
Total other income 79,556 76,768 152,339 150,622
ASU 2014-09 [Member] | All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Brokerage services income 12,478 12,629 24,954 26,021
Other revenues from operations:        
Merchant discount and credit card fees 602 618 1,022 1,233
Other 8,595 7,598 19,083 16,706
Total other income 167,319 159,920 324,384 316,099
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 107,787 106,784 210,899 211,899
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Business Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 15,175 15,611 30,284 31,015
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Commercial Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 23,094 24,270 46,304 48,924
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Commercial Real Estate [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 2,362 2,451 4,888 5,215
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 3 4 6
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Retail Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 65,661 63,015 126,812 123,616
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 1,493 1,434 2,607 3,123
ASU 2014-09 [Member] | Trust Income [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 144,382 137,641 277,168 269,016
ASU 2014-09 [Member] | Trust Income [Member] | Business Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 7   12  
ASU 2014-09 [Member] | Trust Income [Member] | Commercial Banking [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer 224   438  
ASU 2014-09 [Member] | Trust Income [Member] | All Other [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contract with customer $ 144,151 $ 137,641 $ 276,718 $ 269,016