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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financial assets:        
Cash and cash equivalents $ 1,368,040 $ 1,373,357 $ 1,672,934 $ 1,986,615
Interest-bearing deposits at banks 7,594,350 6,470,867    
Trading account assets 273,783 308,175    
Investment securities 15,656,439 12,993,542    
Loans and leases:        
Residential real estate loans 26,249,059 8,636,794    
Consumer loans 11,584,347 10,969,879    
Allowance for credit losses (955,992) (919,562) $ (916,676) $ (925,860)
Loans and leases, net 86,533,507 65,749,394    
Financial liabilities:        
Noninterest-bearing deposits (29,110,635) (26,947,880)    
Time deposits (13,110,392) (3,063,973)    
Deposits at Cayman Islands office (170,170) (176,582)    
Short-term borrowings (150,546) (192,676)    
Long-term borrowings (10,653,858) (9,006,959)    
Trading account liabilities (160,745) (203,464)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Financial assets:        
Cash and cash equivalents 1,276,678 1,296,923    
Trading account assets 56,763 51,416    
Investment securities 65,178 64,841    
Significant Observable Inputs (Level 2) [Member]        
Financial assets:        
Cash and cash equivalents 91,362 76,434    
Interest-bearing deposits at banks 7,594,350 6,470,867    
Trading account assets 217,020 256,759    
Investment securities 15,406,404 12,750,396    
Loans and leases:        
Commercial real estate loans 38,774 307,667    
Residential real estate loans 4,727,816 5,189,086    
Loans and leases, net 4,766,590 5,496,753    
Accrued interest receivable 306,496 227,348    
Financial liabilities:        
Noninterest-bearing deposits (29,110,635) (26,947,880)    
Savings deposits and interest-checking accounts (49,566,644) (43,393,618)    
Time deposits (13,135,042) (3,086,126)    
Deposits at Cayman Islands office (170,170) (176,582)    
Short-term borrowings (2,132,182) (192,676)    
Long-term borrowings (10,639,556) (9,139,789)    
Accrued interest payable (85,145) (63,372)    
Trading account liabilities (160,745) (203,464)    
Other financial instruments:        
Commitments to sell real estate loans 875 (7,065)    
Interest rate swap agreements used for interest rate risk management 43,892 73,251    
Significant Unobservable Inputs (Level 3) [Member]        
Financial assets:        
Investment securities 189,295 208,719    
Loans and leases:        
Commercial loans and leases 20,146,201 19,188,574    
Commercial real estate loans 29,005,470 27,180,151    
Residential real estate loans 21,539,955 3,539,970    
Consumer loans 11,550,270 10,909,623    
Loans and leases, net 82,241,896 60,818,318    
Other financial instruments:        
Commitments to originate real estate loans for sale 9,879 17,347    
Other credit-related commitments (122,334) (119,079)    
Carrying Amount [Member]        
Financial assets:        
Cash and cash equivalents 1,368,040 1,373,357    
Interest-bearing deposits at banks 7,594,350 6,470,867    
Trading account assets 273,783 308,175    
Investment securities 15,656,439 12,993,542    
Loans and leases:        
Commercial loans and leases 20,422,338 19,461,292    
Commercial real estate loans 29,197,311 27,567,569    
Residential real estate loans 26,270,103 8,657,301    
Consumer loans 11,599,747 10,982,794    
Allowance for credit losses (955,992) (919,562)    
Loans and leases, net 86,533,507 65,749,394    
Accrued interest receivable 306,496 227,348    
Financial liabilities:        
Noninterest-bearing deposits (29,110,635) (26,947,880)    
Savings deposits and interest-checking accounts (49,566,644) (43,393,618)    
Time deposits (13,110,392) (3,063,973)    
Deposits at Cayman Islands office (170,170) (176,582)    
Short-term borrowings (2,132,182) (192,676)    
Long-term borrowings (10,653,858) (9,006,959)    
Accrued interest payable (85,145) (63,372)    
Trading account liabilities (160,745) (203,464)    
Other financial instruments:        
Commitments to originate real estate loans for sale 9,879 17,347    
Commitments to sell real estate loans 875 (7,065)    
Other credit-related commitments (122,334) (119,079)    
Interest rate swap agreements used for interest rate risk management 43,892 73,251    
Estimate Fair Value [Member]        
Financial assets:        
Cash and cash equivalents 1,368,040 1,373,357    
Interest-bearing deposits at banks 7,594,350 6,470,867    
Trading account assets 273,783 308,175    
Investment securities 15,660,877 13,023,956    
Loans and leases:        
Commercial loans and leases 20,146,201 19,188,574    
Commercial real estate loans 29,044,244 27,487,818    
Residential real estate loans 26,267,771 8,729,056    
Consumer loans 11,550,270 10,909,623    
Loans and leases, net 87,008,486 66,315,071    
Accrued interest receivable 306,496 227,348    
Financial liabilities:        
Noninterest-bearing deposits (29,110,635) (26,947,880)    
Savings deposits and interest-checking accounts (49,566,644) (43,393,618)    
Time deposits (13,135,042) (3,086,126)    
Deposits at Cayman Islands office (170,170) (176,582)    
Short-term borrowings (2,132,182) (192,676)    
Long-term borrowings (10,639,556) (9,139,789)    
Accrued interest payable (85,145) (63,372)    
Trading account liabilities (160,745) (203,464)    
Other financial instruments:        
Commitments to originate real estate loans for sale 9,879 17,347    
Commitments to sell real estate loans 875 (7,065)    
Other credit-related commitments (122,334) (119,079)    
Interest rate swap agreements used for interest rate risk management $ 43,892 $ 73,251