Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Financial assets:
Cash and cash equivalents	$ 1,178,175	$ 1,368,040	$ 1,366,853	$ 1,373,357
Interest-bearing deposits at banks	9,545,181	7,594,350
Trading account assets	467,987	273,783
Investment securities	15,467,320	15,656,439
Loans and leases:
Allowance for credit losses	(962,752)	(955,992)	$ (921,373)	$ (919,562)
Loans and leases, net	86,909,714	86,533,507
Financial liabilities:
Noninterest-bearing deposits	(29,709,218)	(29,110,635)
Time deposits	(12,841,331)	(13,110,392)
Deposits at Cayman Islands office	(166,787)	(170,170)
Short-term borrowings	(206,709)	(150,546)
Long-term borrowings	(10,341,035)	(10,653,858)
Trading account liabilities	(295,869)	(160,745)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,112,933	1,276,678
Trading account assets	69,689	56,763
Investment securities	67,150	65,178
Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	65,242	91,362
Interest-bearing deposits at banks	9,545,181	7,594,350
Trading account assets	398,298	217,020
Investment securities	15,256,530	15,406,404
Loans and leases:
Commercial real estate loans	127,736	38,774
Residential real estate loans	4,590,667	4,727,816
Loans and leases, net	4,718,403	4,766,590
Accrued interest receivable	318,486	306,496
Financial liabilities:
Noninterest-bearing deposits	(29,709,218)	(29,110,635)
Savings and interest-checking deposits	(51,497,240)	(49,566,644)
Time deposits	(12,879,619)	(13,135,042)
Deposits at Cayman Islands office	(166,787)	(170,170)
Short-term borrowings	(1,766,826)	(2,132,182)
Long-term borrowings	(10,338,217)	(10,639,556)
Accrued interest payable	(80,605)	(85,145)
Trading account liabilities	(295,869)	(160,745)
Other financial instruments:
Commitments to sell real estate loans	4,816	875
Interest rate swap agreements used for interest rate risk management	41,259	43,892
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	182,372	189,295
Loans and leases:
Commercial loans and leases	20,875,827	20,146,201
Commercial real estate loans	29,442,004	29,005,470
Residential real estate loans	20,795,573	21,539,955
Consumer loans	11,553,135	11,550,270
Loans and leases, net	82,666,539	82,241,896
Other financial instruments:
Commitments to originate real estate loans for sale	16,885	9,879
Other credit-related commitments	(118,521)	(122,334)
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,178,175	1,368,040
Interest-bearing deposits at banks	9,545,181	7,594,350
Trading account assets	467,987	273,783
Investment securities	15,467,320	15,656,439
Loans and leases:
Commercial loans and leases	21,226,577	20,422,338
Commercial real estate loans	29,713,293	29,197,311
Residential real estate loans	25,299,638	26,270,103
Consumer loans	11,632,958	11,599,747
Allowance for credit losses	(962,752)	(955,992)
Loans and leases, net	86,909,714	86,533,507
Accrued interest receivable	318,486	306,496
Financial liabilities:
Noninterest-bearing deposits	(29,709,218)	(29,110,635)
Savings and interest-checking deposits	(51,497,240)	(49,566,644)
Time deposits	(12,841,331)	(13,110,392)
Deposits at Cayman Islands office	(166,787)	(170,170)
Short-term borrowings	(1,766,826)	(2,132,182)
Long-term borrowings	(10,341,035)	(10,653,858)
Accrued interest payable	(80,605)	(85,145)
Trading account liabilities	(295,869)	(160,745)
Other financial instruments:
Commitments to originate real estate loans for sale	16,885	9,879
Commitments to sell real estate loans	4,816	875
Other credit-related commitments	(118,521)	(122,334)
Interest rate swap agreements used for interest rate risk management	41,259	43,892
Estimate Fair Value [Member]
Financial assets:
Cash and cash equivalents	1,178,175	1,368,040
Interest-bearing deposits at banks	9,545,181	7,594,350
Trading account assets	467,987	273,783
Investment securities	15,506,052	15,660,877
Loans and leases:
Commercial loans and leases	20,875,827	20,146,201
Commercial real estate loans	29,569,740	29,044,244
Residential real estate loans	25,386,240	26,267,771
Consumer loans	11,553,135	11,550,270
Loans and leases, net	87,384,942	87,008,486
Accrued interest receivable	318,486	306,496
Financial liabilities:
Noninterest-bearing deposits	(29,709,218)	(29,110,635)
Savings and interest-checking deposits	(51,497,240)	(49,566,644)
Time deposits	(12,879,619)	(13,135,042)
Deposits at Cayman Islands office	(166,787)	(170,170)
Short-term borrowings	(1,766,826)	(2,132,182)
Long-term borrowings	(10,338,217)	(10,639,556)
Accrued interest payable	(80,605)	(85,145)
Trading account liabilities	(295,869)	(160,745)
Other financial instruments:
Commitments to originate real estate loans for sale	16,885	9,879
Commitments to sell real estate loans	4,816	875
Other credit-related commitments	(118,521)	(122,334)
Interest rate swap agreements used for interest rate risk management	$ 41,259	$ 43,892

Commitments to originate real estate loans for sale.

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Commitments To Sell Real Estate Loans Net

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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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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 loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements.

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