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

Commitments to originate real estate loans for sale.

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Gain (loss) on commitments to sell real estate loans.

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Interest rate swap agreements used for interest rate risk management.

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Amount before allowance of consumer installment revolving and home equity loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts.

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Other credit-related commitments.

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Other financial instruments.

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Savings deposits and interest checking accounts.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer mortgage. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes subordinated loans such as home equity lines of credit and loans and leases covered under loss sharing agreements.

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