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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Financial assets:            
Interest-bearing deposits at banks $ 6,669,985   $ 5,078,903      
Trading account assets 148,303   132,909      
Investment securities 13,283,002   14,664,525      
Loans and leases:            
Allowance for credit losses (1,019,248) $ (1,019,671) (1,017,198) $ (1,008,225) $ (1,001,430) $ (988,997)
Loans and leases, net 86,778,202   86,971,785      
Financial liabilities:            
Noninterest-bearing deposits (32,086,191)   (33,975,180)      
Savings and interest-checking deposits (51,107,290)   (51,698,008)      
Time deposits (5,817,680)   (6,580,962)      
Deposits at Cayman Islands office (261,427)   (177,996)      
Long-term borrowings (8,382,316)   (8,141,430)      
Estimate Fair Value [Member]            
Financial assets:            
Cash and cash equivalents 1,369,094   1,420,888      
Interest-bearing deposits at banks 6,669,985   5,078,903      
Trading account assets 148,303   132,909      
Investment securities 13,204,236   14,653,074      
Loans and leases:            
Commercial loans and leases 21,465,594   21,321,282      
Commercial real estate loans 33,579,305   32,950,724      
Residential real estate loans 18,110,823   19,596,826      
Consumer loans 13,257,759   13,161,517      
Loans and leases, net 86,413,481   87,030,349      
Accrued interest receivable 333,549   327,170      
Financial liabilities:            
Noninterest-bearing deposits (32,086,191)   (33,975,180)      
Savings and interest-checking deposits (51,107,290)   (51,698,008)      
Time deposits (5,865,067)   (6,635,048)      
Deposits at Cayman Islands office (261,427)   (177,996)      
Short-term borrowings (3,239,416)   (175,099)      
Long-term borrowings (8,392,684)   (8,193,783)      
Accrued interest payable (87,779)   (75,641)      
Trading account liabilities (281,538)   (137,390)      
Other financial instruments:            
Commitments to originate real estate loans for sale 10,751   8,303      
Commitments to sell real estate loans 882   1,958      
Other credit-related commitments (127,898)   (125,281)      
Interest rate swap agreements used for interest rate risk management (129)   639      
Estimate Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]            
Financial assets:            
Cash and cash equivalents 1,258,614   1,352,035      
Trading account assets 46,502   47,873      
Investment securities 65,748   73,232      
Estimate Fair Value [Member] | Significant Observable Inputs (Level 2) [Member]            
Financial assets:            
Cash and cash equivalents 110,480   68,853      
Interest-bearing deposits at banks 6,669,985   5,078,903      
Trading account assets 101,801   85,036      
Investment securities 13,027,717   14,469,127      
Loans and leases:            
Commercial real estate loans 868,392   22,130      
Residential real estate loans 4,128,794   4,440,645      
Loans and leases, net 4,997,186   4,462,775      
Accrued interest receivable 333,549   327,170      
Financial liabilities:            
Noninterest-bearing deposits (32,086,191)   (33,975,180)      
Savings and interest-checking deposits (51,107,290)   (51,698,008)      
Time deposits (5,865,067)   (6,635,048)      
Deposits at Cayman Islands office (261,427)   (177,996)      
Short-term borrowings (3,239,416)   (175,099)      
Long-term borrowings (8,392,684)   (8,193,783)      
Accrued interest payable (87,779)   (75,641)      
Trading account liabilities (281,538)   (137,390)      
Other financial instruments:            
Commitments to sell real estate loans 882   1,958      
Interest rate swap agreements used for interest rate risk management (129)   639      
Estimate Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]            
Financial assets:            
Investment securities 110,771   110,715      
Loans and leases:            
Commercial loans and leases 21,465,594   21,321,282      
Commercial real estate loans 32,710,913   32,928,594      
Residential real estate loans 13,982,029   15,156,181      
Consumer loans 13,257,759   13,161,517      
Loans and leases, net 81,416,295   82,567,574      
Other financial instruments:            
Commitments to originate real estate loans for sale 10,751   8,303      
Other credit-related commitments (127,898)   (125,281)      
Carrying Amount [Member]            
Financial assets:            
Cash and cash equivalents 1,369,094   1,420,888      
Interest-bearing deposits at banks 6,669,985   5,078,903      
Trading account assets 148,303   132,909      
Investment securities 13,283,002   14,664,525      
Loans and leases:            
Commercial loans and leases 21,894,857   21,742,651      
Commercial real estate loans 34,137,937   33,366,373      
Residential real estate loans 18,310,712   19,613,344      
Consumer loans 13,453,944   13,266,615      
Allowance for credit losses (1,019,248)   (1,017,198)      
Loans and leases, net 86,778,202   86,971,785      
Accrued interest receivable 333,549   327,170      
Financial liabilities:            
Noninterest-bearing deposits (32,086,191)   (33,975,180)      
Savings and interest-checking deposits (51,107,290)   (51,698,008)      
Time deposits (5,817,680)   (6,580,962)      
Deposits at Cayman Islands office (261,427)   (177,996)      
Short-term borrowings (3,239,416)   (175,099)      
Long-term borrowings (8,382,316)   (8,141,430)      
Accrued interest payable (87,779)   (75,641)      
Trading account liabilities (281,538)   (137,390)      
Other financial instruments:            
Commitments to originate real estate loans for sale 10,751   8,303      
Commitments to sell real estate loans 882   1,958      
Other credit-related commitments (127,898)   (125,281)      
Interest rate swap agreements used for interest rate risk management $ (129)   $ 639