Commitments to originate real estate loans for sale.

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Commitments to sell real estate loans net.

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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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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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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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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The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements.

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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, 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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Amount, before allowance for credit loss, of financing receivable.

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Amount of time deposit liabilities, including certificates of deposit.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Financial assets:
Interest-bearing deposits at banks	$ 12,495,524		$ 8,105,197
Federal funds sold	200
Investment securities	10,677,583		12,692,813
Loans and leases:
Allowance for credit losses	(1,038,437)	$ (1,029,867)	(1,019,444)	$ (1,019,488)	$ (1,019,248)	$ (1,017,198)
Loans and leases, net	88,784,756		87,447,033
Financial liabilities:
Noninterest-bearing deposits	(31,766,724)		(32,256,668)
Savings and interest-checking deposits	(55,581,533)		(50,963,744)
Time deposits	(6,203,679)		(6,124,254)
Deposits at Cayman Islands office	(1,561,997)		(811,906)
Long-term borrowings	(7,002,524)		(8,444,914)
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,818,861		1,605,439
Interest-bearing deposits at banks	12,495,524		8,105,197
Federal funds sold	200
Trading account assets	614,256		185,584
Investment securities	10,677,583		12,692,813
Loans and leases:
Consumer loans	15,175,635		13,970,499
Allowance for credit losses	(1,038,437)		(1,019,444)
Loans and leases, net	88,784,756		87,447,033
Accrued interest receivable	340,543		353,965
Financial liabilities:
Noninterest-bearing deposits	(31,766,724)		(32,256,668)
Savings and interest-checking deposits	(55,581,533)		(50,963,744)
Time deposits	(6,203,679)		(6,124,254)
Deposits at Cayman Islands office	(1,561,997)		(811,906)
Short-term borrowings	(5,513,896)		(4,398,378)
Long-term borrowings	(7,002,524)		(8,444,914)
Accrued interest payable	(90,623)		(95,274)
Trading account liabilities	(82,042)		(178,125)
Other financial instruments:
Commitments to originate real estate loans for sale	24,274		7,712
Commitments to sell real estate loans	(11,912)		(6,177)
Other credit-related commitments	(130,413)		(131,688)
Interest rate swap agreements used for interest rate risk management	(6,142)		5,530
Carrying Amount [Member] \| Commercial Loans And Leases
Loans and leases:
Commercial loans and leases	23,201,372		22,977,976
Commercial real estate loans	23,201,372		22,977,976
Carrying Amount [Member] \| Commercial [Member]
Loans and leases:
Commercial loans and leases	34,945,231		34,363,556
Commercial real estate loans	34,945,231		34,363,556
Carrying Amount [Member] \| Residential Real Estate Loans
Loans and leases:
Commercial loans and leases	16,500,955		17,154,446
Commercial real estate loans	16,500,955		17,154,446
Estimate Fair Value [Member]
Financial assets:
Cash and cash equivalents	1,818,861		1,605,439
Interest-bearing deposits at banks	12,495,524		8,105,197
Federal funds sold	200
Trading account assets	614,256		185,584
Investment securities	10,721,588		12,631,656
Loans and leases:
Consumer loans	15,157,025		13,819,545
Loans and leases, net	89,350,881		87,214,035
Accrued interest receivable	340,543		353,965
Financial liabilities:
Noninterest-bearing deposits	(31,766,724)		(32,256,668)
Savings and interest-checking deposits	(55,581,533)		(50,963,744)
Time deposits	(6,289,534)		(6,201,957)
Deposits at Cayman Islands office	(1,561,997)		(811,906)
Short-term borrowings	(5,513,896)		(4,398,378)
Long-term borrowings	(7,056,344)		(8,385,289)
Accrued interest payable	(90,623)		(95,274)
Trading account liabilities	(82,042)		(178,125)
Other financial instruments:
Commitments to originate real estate loans for sale	24,274		7,712
Commitments to sell real estate loans	(11,912)		(6,177)
Other credit-related commitments	(130,413)		(131,688)
Interest rate swap agreements used for interest rate risk management	(6,142)		5,530
Estimate Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,765,090		1,528,302
Trading account assets	48,724		46,018
Investment securities	104,199		71,989
Estimate Fair Value [Member] \| Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	53,771		77,137
Interest-bearing deposits at banks	12,495,524		8,105,197
Federal funds sold	200
Trading account assets	565,532		139,566
Investment securities	10,525,863		12,456,467
Loans and leases:
Loans and leases, net	4,219,026		4,267,222
Accrued interest receivable	340,543		353,965
Financial liabilities:
Noninterest-bearing deposits	(31,766,724)		(32,256,668)
Savings and interest-checking deposits	(55,581,533)		(50,963,744)
Time deposits	(6,289,534)		(6,201,957)
Deposits at Cayman Islands office	(1,561,997)		(811,906)
Short-term borrowings	(5,513,896)		(4,398,378)
Long-term borrowings	(7,056,344)		(8,385,289)
Accrued interest payable	(90,623)		(95,274)
Trading account liabilities	(82,042)		(178,125)
Other financial instruments:
Commitments to sell real estate loans	(11,912)		(6,177)
Interest rate swap agreements used for interest rate risk management	(6,142)		5,530
Estimate Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	91,526		103,200
Loans and leases:
Consumer loans	15,157,025		13,819,545
Loans and leases, net	85,131,855		82,946,813
Other financial instruments:
Commitments to originate real estate loans for sale	24,274		7,712
Other credit-related commitments	(130,413)		(131,688)
Estimate Fair Value [Member] \| Commercial Loans And Leases
Loans and leases:
Commercial loans and leases	22,844,883		22,587,387
Commercial real estate loans	22,844,883		22,587,387
Estimate Fair Value [Member] \| Commercial Loans And Leases \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	22,844,883		22,587,387
Commercial real estate loans	22,844,883		22,587,387
Estimate Fair Value [Member] \| Commercial [Member]
Loans and leases:
Commercial loans and leases	34,772,982		33,832,558
Commercial real estate loans	34,772,982		33,832,558
Estimate Fair Value [Member] \| Commercial [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Commercial loans and leases	197,141		346,775
Commercial real estate loans	197,141		346,775
Estimate Fair Value [Member] \| Commercial [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	34,575,841		33,485,783
Commercial real estate loans	34,575,841		33,485,783
Estimate Fair Value [Member] \| Residential Real Estate Loans
Loans and leases:
Commercial loans and leases	16,575,991		16,974,545
Commercial real estate loans	16,575,991		16,974,545
Estimate Fair Value [Member] \| Residential Real Estate Loans \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Commercial loans and leases	4,021,885		3,920,447
Commercial real estate loans	4,021,885		3,920,447
Estimate Fair Value [Member] \| Residential Real Estate Loans \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	12,554,106		13,054,098
Commercial real estate loans	$ 12,554,106		$ 13,054,098