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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Financial assets:            
Cash and cash equivalents $ 1,284,442   $ 1,368,040 $ 1,350,858   $ 1,373,357
Interest-bearing deposits at banks 8,474,839   7,594,350      
Trading account assets 506,131   273,783      
Investment securities 14,963,084   15,656,439      
Loans and leases:            
Allowance for credit losses (970,496) $ (962,752) (955,992) $ (929,987) $ (921,373) $ (919,562)
Loans and leases, net 87,551,502   86,533,507      
Financial liabilities:            
Noninterest-bearing deposits (30,700,066)   (29,110,635)      
Time deposits (12,630,277)   (13,110,392)      
Deposits at Cayman Islands office (193,523)   (170,170)      
Short-term borrowings (206,943)   (150,546)      
Long-term borrowings (10,328,751)   (10,653,858)      
Trading account liabilities (352,541)   (160,745)      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]            
Financial assets:            
Cash and cash equivalents 1,216,801   1,276,678      
Trading account assets 62,167   56,763      
Investment securities 59,647   65,178      
Significant Observable Inputs (Level 2) [Member]            
Financial assets:            
Cash and cash equivalents 67,641   91,362      
Interest-bearing deposits at banks 8,474,839   7,594,350      
Trading account assets 443,964   217,020      
Investment securities 14,779,939   15,406,404      
Loans and leases:            
Commercial real estate loans 227,929   38,774      
Residential real estate loans 4,673,968   4,727,816      
Loans and leases, net 4,901,897   4,766,590      
Accrued interest receivable 299,158   306,496      
Financial liabilities:            
Noninterest-bearing deposits (30,700,066)   (29,110,635)      
Savings and interest-checking deposits (51,126,237)   (49,566,644)      
Time deposits (12,677,606)   (13,135,042)      
Deposits at Cayman Islands office (193,523)   (170,170)      
Short-term borrowings (407,123)   (2,132,182)      
Long-term borrowings (10,382,523)   (10,639,556)      
Accrued interest payable (80,165)   (85,145)      
Trading account liabilities (352,541)   (160,745)      
Other financial instruments:            
Commitments to sell real estate loans 15,902   875      
Interest rate swap agreements used for interest rate risk management 33,648   43,892      
Significant Unobservable Inputs (Level 3) [Member]            
Financial assets:            
Investment securities 172,336   189,295      
Loans and leases:            
Commercial loans and leases 21,119,041   20,146,201      
Commercial real estate loans 30,325,791   29,005,470      
Residential real estate loans 20,064,036   21,539,955      
Consumer loans 11,713,181   11,550,270      
Loans and leases, net 83,222,049   82,241,896      
Other financial instruments:            
Commitments to originate real estate loans for sale 21,383   9,879      
Other credit-related commitments (125,630)   (122,334)      
Carrying Amount [Member]            
Financial assets:            
Cash and cash equivalents 1,284,442   1,368,040      
Interest-bearing deposits at banks 8,474,839   7,594,350      
Trading account assets 506,131   273,783      
Investment securities 14,963,084   15,656,439      
Loans and leases:            
Commercial loans and leases 21,469,242   20,422,338      
Commercial real estate loans 30,711,230   29,197,311      
Residential real estate loans 24,530,249   26,270,103      
Consumer loans 11,811,277   11,599,747      
Allowance for credit losses (970,496)   (955,992)      
Loans and leases, net 87,551,502   86,533,507      
Accrued interest receivable 299,158   306,496      
Financial liabilities:            
Noninterest-bearing deposits (30,700,066)   (29,110,635)      
Savings and interest-checking deposits (51,126,237)   (49,566,644)      
Time deposits (12,630,277)   (13,110,392)      
Deposits at Cayman Islands office (193,523)   (170,170)      
Short-term borrowings (407,123)   (2,132,182)      
Long-term borrowings (10,328,751)   (10,653,858)      
Accrued interest payable (80,165)   (85,145)      
Trading account liabilities (352,541)   (160,745)      
Other financial instruments:            
Commitments to originate real estate loans for sale 21,383   9,879      
Commitments to sell real estate loans 15,902   875      
Other credit-related commitments (125,630)   (122,334)      
Interest rate swap agreements used for interest rate risk management 33,648   43,892      
Estimate Fair Value [Member]            
Financial assets:            
Cash and cash equivalents 1,284,442   1,368,040      
Interest-bearing deposits at banks 8,474,839   7,594,350      
Trading account assets 506,131   273,783      
Investment securities 15,011,922   15,660,877      
Loans and leases:            
Commercial loans and leases 21,119,041   20,146,201      
Commercial real estate loans 30,553,720   29,044,244      
Residential real estate loans 24,738,004   26,267,771      
Consumer loans 11,713,181   11,550,270      
Loans and leases, net 88,123,946   87,008,486      
Accrued interest receivable 299,158   306,496      
Financial liabilities:            
Noninterest-bearing deposits (30,700,066)   (29,110,635)      
Savings and interest-checking deposits (51,126,237)   (49,566,644)      
Time deposits (12,677,606)   (13,135,042)      
Deposits at Cayman Islands office (193,523)   (170,170)      
Short-term borrowings (407,123)   (2,132,182)      
Long-term borrowings (10,382,523)   (10,639,556)      
Accrued interest payable (80,165)   (85,145)      
Trading account liabilities (352,541)   (160,745)      
Other financial instruments:            
Commitments to originate real estate loans for sale 21,383   9,879      
Commitments to sell real estate loans 15,902   875      
Other credit-related commitments (125,630)   (122,334)      
Interest rate swap agreements used for interest rate risk management $ 33,648   $ 43,892