Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financial assets:
Interest-bearing deposits at banks	$ 6,135,434	$ 5,078,903
Trading account assets	141,134	132,909
Investment securities	14,066,564	14,664,525
Loans and leases:
Allowance for credit losses	(1,019,671)	(1,017,198)	$ (1,001,430)	$ (988,997)
Loans and leases, net	86,691,078	86,971,785
Financial liabilities:
Noninterest-bearing deposits	(31,817,516)	(33,975,180)
Savings and interest-checking deposits	(52,724,608)	(51,698,008)
Time deposits	(6,126,442)	(6,580,962)
Deposits at Cayman Islands office	(278,064)	(177,996)
Long-term borrowings	(8,591,051)	(8,141,430)
Estimate Fair Value [Member]
Financial assets:
Cash and cash equivalents	1,292,664	1,420,888
Interest-bearing deposits at banks	6,135,434	5,078,903
Trading account assets	141,134	132,909
Investment securities	13,998,023	14,653,074
Loans and leases:
Commercial loans and leases	21,294,038	21,321,282
Commercial real estate loans	33,123,306	32,950,724
Residential real estate loans	18,812,289	19,596,826
Consumer loans	13,112,874	13,161,517
Loans and leases, net	86,342,507	87,030,349
Accrued interest receivable	332,151	327,170
Financial liabilities:
Noninterest-bearing deposits	(31,817,516)	(33,975,180)
Savings and interest-checking deposits	(52,724,608)	(51,698,008)
Time deposits	(6,177,695)	(6,635,048)
Deposits at Cayman Islands office	(278,064)	(177,996)
Short-term borrowings	(1,626,129)	(175,099)
Long-term borrowings	(8,598,328)	(8,193,783)
Accrued interest payable	(65,819)	(75,641)
Trading account liabilities	(236,834)	(137,390)
Other financial instruments:
Commitments to originate real estate loans for sale	8,760	8,303
Commitments to sell real estate loans	2,885	1,958
Other credit-related commitments	(122,805)	(125,281)
Interest rate swap agreements used for interest rate risk management	376	639
Estimate Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,206,172	1,352,035
Trading account assets	46,215	47,873
Investment securities	43,496	73,232
Estimate Fair Value [Member] \| Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	86,492	68,853
Interest-bearing deposits at banks	6,135,434	5,078,903
Trading account assets	94,919	85,036
Investment securities	13,841,655	14,469,127
Loans and leases:
Commercial real estate loans	166,773	22,130
Residential real estate loans	4,226,284	4,440,645
Loans and leases, net	4,393,057	4,462,775
Accrued interest receivable	332,151	327,170
Financial liabilities:
Noninterest-bearing deposits	(31,817,516)	(33,975,180)
Savings and interest-checking deposits	(52,724,608)	(51,698,008)
Time deposits	(6,177,695)	(6,635,048)
Deposits at Cayman Islands office	(278,064)	(177,996)
Short-term borrowings	(1,626,129)	(175,099)
Long-term borrowings	(8,598,328)	(8,193,783)
Accrued interest payable	(65,819)	(75,641)
Trading account liabilities	(236,834)	(137,390)
Other financial instruments:
Commitments to sell real estate loans	2,885	1,958
Interest rate swap agreements used for interest rate risk management	376	639
Estimate Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	112,872	110,715
Loans and leases:
Commercial loans and leases	21,294,038	21,321,282
Commercial real estate loans	32,956,533	32,928,594
Residential real estate loans	14,586,005	15,156,181
Consumer loans	13,112,874	13,161,517
Loans and leases, net	81,949,450	82,567,574
Other financial instruments:
Commitments to originate real estate loans for sale	8,760	8,303
Other credit-related commitments	(122,805)	(125,281)
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,292,664	1,420,888
Interest-bearing deposits at banks	6,135,434	5,078,903
Trading account assets	141,134	132,909
Investment securities	14,066,564	14,664,525
Loans and leases:
Commercial loans and leases	21,697,522	21,742,651
Commercial real estate loans	33,753,506	33,366,373
Residential real estate loans	18,960,946	19,613,344
Consumer loans	13,298,775	13,266,615
Allowance for credit losses	(1,019,671)	(1,017,198)
Loans and leases, net	86,691,078	86,971,785
Accrued interest receivable	332,151	327,170
Financial liabilities:
Noninterest-bearing deposits	(31,817,516)	(33,975,180)
Savings and interest-checking deposits	(52,724,608)	(51,698,008)
Time deposits	(6,126,442)	(6,580,962)
Deposits at Cayman Islands office	(278,064)	(177,996)
Short-term borrowings	(1,626,129)	(175,099)
Long-term borrowings	(8,591,051)	(8,141,430)
Accrued interest payable	(65,819)	(75,641)
Trading account liabilities	(236,834)	(137,390)
Other financial instruments:
Commitments to originate real estate loans for sale	8,760	8,303
Commitments to sell real estate loans	2,885	1,958
Other credit-related commitments	(122,805)	(125,281)
Interest rate swap agreements used for interest rate risk management	$ 376	$ 639

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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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Amount of domestic interest-bearing checking and savings accounts, which may include money market accounts, NOW accounts, interest-bearing corporate checking accounts, brokered deposits and other savings accounts.

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

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