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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
Mar. 31, 2019
Mar. 31, 2018
Disaggregation Of Revenue [Line Items]    
Brokerage services income $ 12,476 $ 13,392
Other revenues from operations:    
Total other income 500,765 458,696
Service Charges on Deposit Accounts [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 103,112 105,115
Trust Income [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 132,786 131,375
ASU 2014-09 [Member]    
Disaggregation Of Revenue [Line Items]    
Brokerage services income 12,476 13,392
Other revenues from operations:    
Merchant discount and credit card fees 25,138 24,772
Other 23,237 22,890
Total other income 296,749 297,544
ASU 2014-09 [Member] | Business Banking [Member]    
Other revenues from operations:    
Merchant discount and credit card fees 8,882 7,503
Total other income 23,996 22,907
ASU 2014-09 [Member] | Commercial Banking [Member]    
Other revenues from operations:    
Merchant discount and credit card fees 12,092 12,712
Other 1,002 1,563
Total other income 36,518 38,929
ASU 2014-09 [Member] | Commercial Real Estate [Member]    
Other revenues from operations:    
Merchant discount and credit card fees 606 554
Other 1,788 859
Total other income 4,920 4,177
ASU 2014-09 [Member] | Discretionary Portfolio [Member]    
Other revenues from operations:    
Other 401 452
Total other income 401 452
ASU 2014-09 [Member] | Residential Mortgage Banking [Member]    
Other revenues from operations:    
Other 1,064 1,043
Total other income 1,066 1,046
ASU 2014-09 [Member] | Retail Banking [Member]    
Other revenues from operations:    
Merchant discount and credit card fees 3,138 3,388
Other 8,494 9,865
Total other income 72,783 73,854
ASU 2014-09 [Member] | All Other [Member]    
Disaggregation Of Revenue [Line Items]    
Brokerage services income 12,476 13,392
Other revenues from operations:    
Merchant discount and credit card fees 420 615
Other 10,488 9,108
Total other income 157,065 156,179
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 103,112 105,115
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Business Banking [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 15,109 15,404
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Commercial Banking [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 23,210 24,654
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Commercial Real Estate [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 2,526 2,764
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
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | Retail Banking [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 61,151 60,601
ASU 2014-09 [Member] | Service Charges on Deposit Accounts [Member] | All Other [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 1,114 1,689
ASU 2014-09 [Member] | Trust Income [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 132,786 131,375
ASU 2014-09 [Member] | Trust Income [Member] | Business Banking [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 5  
ASU 2014-09 [Member] | Trust Income [Member] | Commercial Banking [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer 214  
ASU 2014-09 [Member] | Trust Income [Member] | All Other [Member]    
Disaggregation Of Revenue [Line Items]    
Revenue from contract with customer $ 132,567 $ 131,375