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Revenue from Contracts with Customers - Summary of Sources of Company's Noninterest Income that are Subject to the Amended Guidance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation Of Revenue [Line Items]      
Brokerage services income $ 51,069 $ 61,445 $ 63,423
Other revenues from operations:      
Total other income 1,856,000 1,851,143 1,825,996
Service Charges on Deposit Accounts [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 429,337 427,372 419,102
Trust Income [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 537,585 $ 501,381 $ 472,184
ASU 2014-09 [Member]      
Disaggregation Of Revenue [Line Items]      
Brokerage services income 51,069    
Other revenues from operations:      
Merchant discount and credit card fees 105,953    
Other 90,369    
Total other income 1,214,313    
ASU 2014-09 [Member] | Business Banking [Member]      
Other revenues from operations:      
Merchant discount and credit card fees 34,557    
Total other income 96,889    
ASU 2014-09 [Member] | Commercial Banking [Member]      
Other revenues from operations:      
Merchant discount and credit card fees 52,051    
Other 8,796    
Total other income 158,171    
ASU 2014-09 [Member] | Commercial Real Estate [Member]      
Other revenues from operations:      
Merchant discount and credit card fees 2,213    
Other 7,259    
Total other income 19,342    
ASU 2014-09 [Member] | Discretionary Portfolio [Member]      
Other revenues from operations:      
Other 1,738    
Total other income 1,738    
ASU 2014-09 [Member] | Residential Mortgage Banking [Member]      
Other revenues from operations:      
Other 3,814    
Total other income 3,824    
ASU 2014-09 [Member] | Retail Banking [Member]      
Other revenues from operations:      
Merchant discount and credit card fees 14,924    
Other 38,529    
Total other income 308,043    
ASU 2014-09 [Member] | All Other [Member]      
Disaggregation Of Revenue [Line Items]      
Brokerage services income 51,069    
Other revenues from operations:      
Merchant discount and credit card fees 2,208    
Other 30,233    
Total other income 626,306    
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 429,337    
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Business Banking [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 62,323    
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Commercial Banking [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 96,407    
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Commercial Real Estate [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 9,870    
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Residential Mortgage Banking [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 10    
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Retail Banking [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 254,590    
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | All Other [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 6,137    
ASU 2014-09 [Member] | Trust Income [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 537,585    
ASU 2014-09 [Member] | Trust Income [Member] | Business Banking [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 9    
ASU 2014-09 [Member] | Trust Income [Member] | Commercial Banking [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer 917    
ASU 2014-09 [Member] | Trust Income [Member] | All Other [Member]      
Disaggregation Of Revenue [Line Items]      
Revenue from contract with customer $ 536,659