Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial assets:
Cash and cash equivalents	$ 1,420,888	$ 1,320,549	$ 1,368,040	$ 1,373,357
Interest-bearing deposits at banks	5,078,903	5,000,638
Trading account assets	132,909	323,867
Investment securities	14,664,525	16,250,468
Loans and leases:
Residential real estate loans	19,619,259	22,584,141
Consumer loans	13,251,665	12,130,094
Allowance for credit losses	(1,017,198)	(988,997)	$ (955,992)	$ (919,562)
Loans and leases, net	86,971,785	89,864,419
Financial liabilities:
Noninterest-bearing deposits	(33,975,180)	(32,813,896)
Savings and interest-checking deposits	(51,698,008)	(52,346,207)
Time deposits	(6,580,962)	(10,131,846)
Deposits at Cayman Islands office	(177,996)	(201,927)
Long-term borrowings	(8,141,430)	(9,493,835)
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,420,888	1,320,549
Interest-bearing deposits at banks	5,078,903	5,000,638
Trading account assets	132,909	323,867
Investment securities	14,664,525	16,250,468
Loans and leases:
Commercial loans and leases	21,742,651	22,610,047
Commercial real estate loans	33,366,373	33,506,394
Residential real estate loans	19,613,344	22,590,912
Consumer loans	13,266,615	12,146,063
Allowance for credit losses	(1,017,198)	(988,997)
Loans and leases, net	86,971,785	89,864,419
Accrued interest receivable	327,170	308,805
Financial liabilities:
Noninterest-bearing deposits	(33,975,180)	(32,813,896)
Savings and interest-checking deposits	(51,698,008)	(52,346,207)
Time deposits	(6,580,962)	(10,131,846)
Deposits at Cayman Islands office	(177,996)	(201,927)
Short-term borrowings	(175,099)	(163,442)
Long-term borrowings	(8,141,430)	(9,493,835)
Accrued interest payable	(75,641)	(75,172)
Trading account liabilities	(137,390)	(174,376)
Other financial instruments:
Commitments to originate real estate loans for sale	8,303	7,325
Commitments to sell real estate loans	1,958	36,653
Other credit-related commitments	(125,281)	(136,295)
Interest rate swap agreements used for interest rate risk management	639	11,892
Estimate Fair Value [Member]
Financial assets:
Cash and cash equivalents	1,420,888	1,320,549
Interest-bearing deposits at banks	5,078,903	5,000,638
Trading account assets	132,909	323,867
Investment securities	14,653,074	16,244,412
Loans and leases:
Commercial loans and leases	21,321,282	22,239,428
Commercial real estate loans	32,950,724	33,129,428
Residential real estate loans	19,596,826	22,638,167
Consumer loans	13,161,517	12,061,590
Loans and leases, net	87,030,349	90,068,613
Accrued interest receivable	327,170	308,805
Financial liabilities:
Noninterest-bearing deposits	(33,975,180)	(32,813,896)
Savings and interest-checking deposits	(51,698,008)	(52,346,207)
Time deposits	(6,635,048)	(10,222,585)
Deposits at Cayman Islands office	(177,996)	(201,927)
Short-term borrowings	(175,099)	(163,442)
Long-term borrowings	(8,193,783)	(9,473,844)
Accrued interest payable	(75,641)	(75,172)
Trading account liabilities	(137,390)	(174,376)
Other financial instruments:
Commitments to originate real estate loans for sale	8,303	7,325
Commitments to sell real estate loans	1,958	36,653
Other credit-related commitments	(125,281)	(136,295)
Interest rate swap agreements used for interest rate risk management	639	11,892
Estimate Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,352,035	1,249,654
Trading account assets	47,873	46,135
Investment securities	73,232	301,711
Estimate Fair Value [Member] \| Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	68,853	70,895
Interest-bearing deposits at banks	5,078,903	5,000,638
Trading account assets	85,036	277,732
Investment securities	14,469,127	15,821,176
Loans and leases:
Commercial real estate loans	22,130	642,590
Residential real estate loans	4,440,645	4,912,488
Loans and leases, net	4,462,775	5,555,078
Accrued interest receivable	327,170	308,805
Financial liabilities:
Noninterest-bearing deposits	(33,975,180)	(32,813,896)
Savings and interest-checking deposits	(51,698,008)	(52,346,207)
Time deposits	(6,635,048)	(10,222,585)
Deposits at Cayman Islands office	(177,996)	(201,927)
Short-term borrowings	(175,099)	(163,442)
Long-term borrowings	(8,193,783)	(9,473,844)
Accrued interest payable	(75,641)	(75,172)
Trading account liabilities	(137,390)	(174,376)
Other financial instruments:
Commitments to sell real estate loans	1,958	36,653
Interest rate swap agreements used for interest rate risk management	639	11,892
Estimate Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	110,715	121,525
Loans and leases:
Commercial loans and leases	21,321,282	22,239,428
Commercial real estate loans	32,928,594	32,486,838
Residential real estate loans	15,156,181	17,725,679
Consumer loans	13,161,517	12,061,590
Loans and leases, net	82,567,574	84,513,535
Other financial instruments:
Commitments to originate real estate loans for sale	8,303	7,325
Other credit-related commitments	$ (125,281)	$ (136,295)

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Commitments to sell real estate loans net.

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Other credit-related commitments.

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Amount after offset of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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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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Amount of interest payable on debt, including, but not limited to, trade payables.

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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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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.

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Fair value portion of liabilities pertaining to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include, but are not limited to, short positions in securities, derivatives and commodities.

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