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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The aggregate of all foreign interest-bearing and noninterest-bearing deposit liabilities.

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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 before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 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, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financial assets:
Interest-bearing deposits at banks	$ 6,523,746		$ 5,078,903
Trading account assets	125,038		132,909
Investment securities	13,073,881		14,664,525
Loans and leases:
Allowance for credit losses	(1,019,488)	$ (1,019,248)	(1,017,198)	$ (1,013,326)	$ (1,008,225)	$ (988,997)
Loans and leases, net	85,660,997		86,971,785
Financial liabilities:
Noninterest-bearing deposits	(31,773,560)		(33,975,180)
Savings and interest-checking deposits	(51,108,962)		(51,698,008)
Time deposits	(5,810,587)		(6,580,962)
Deposits at Cayman Islands office	(447,287)		(177,996)
Long-term borrowings	(9,140,268)		(8,141,430)
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,311,611		1,420,888
Interest-bearing deposits at banks	6,523,746		5,078,903
Trading account assets	125,038		132,909
Investment securities	12,968,432		14,653,074
Loans and leases:
Commercial loans and leases	21,215,945		21,321,282
Commercial real estate loans	32,971,832		32,950,724
Residential real estate loans	17,429,777		19,596,826
Consumer loans	13,676,356		13,161,517
Loans and leases, net	85,293,910		87,030,349
Accrued interest receivable	349,903		327,170
Financial liabilities:
Noninterest-bearing deposits	(31,773,560)		(33,975,180)
Savings and interest-checking deposits	(51,108,962)		(51,698,008)
Time deposits	(5,872,516)		(6,635,048)
Deposits at Cayman Islands office	(447,287)		(177,996)
Short-term borrowings	(1,310,110)		(175,099)
Long-term borrowings	(9,160,009)		(8,193,783)
Accrued interest payable	(68,196)		(75,641)
Trading account liabilities	(308,733)		(137,390)
Other financial instruments:
Commitments to originate real estate loans for sale	4,186		8,303
Commitments to sell real estate loans	10,831		1,958
Other credit-related commitments	(129,102)		(125,281)
Interest rate swap agreements used for interest rate risk management	2,446		639
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,232,393		1,352,035
Trading account assets	47,653		47,873
Investment securities	72,651		73,232
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	79,218		68,853
Interest-bearing deposits at banks	6,523,746		5,078,903
Trading account assets	77,385		85,036
Investment securities	12,790,484		14,469,127
Loans and leases:
Commercial real estate loans	381,007		22,130
Residential real estate loans	3,984,387		4,440,645
Loans and leases, net	4,365,394		4,462,775
Accrued interest receivable	349,903		327,170
Financial liabilities:
Noninterest-bearing deposits	(31,773,560)		(33,975,180)
Savings and interest-checking deposits	(51,108,962)		(51,698,008)
Time deposits	(5,872,516)		(6,635,048)
Deposits at Cayman Islands office	(447,287)		(177,996)
Short-term borrowings	(1,310,110)		(175,099)
Long-term borrowings	(9,160,009)		(8,193,783)
Accrued interest payable	(68,196)		(75,641)
Trading account liabilities	(308,733)		(137,390)
Other financial instruments:
Commitments to sell real estate loans	10,831		1,958
Interest rate swap agreements used for interest rate risk management	2,446		639
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	105,297		110,715
Loans and leases:
Commercial loans and leases	21,215,945		21,321,282
Commercial real estate loans	32,590,825		32,928,594
Residential real estate loans	13,445,390		15,156,181
Consumer loans	13,676,356		13,161,517
Loans and leases, net	80,928,516		82,567,574
Other financial instruments:
Commitments to originate real estate loans for sale	4,186		8,303
Other credit-related commitments	(129,102)		(125,281)
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,311,611		1,420,888
Interest-bearing deposits at banks	6,523,746		5,078,903
Trading account assets	125,038		132,909
Investment securities	13,073,881		14,664,525
Loans and leases:
Commercial loans and leases	21,635,394		21,742,651
Commercial real estate loans	33,518,375		33,366,373
Residential real estate loans	17,721,399		19,613,344
Consumer loans	13,805,317		13,266,615
Allowance for credit losses	(1,019,488)		(1,017,198)
Loans and leases, net	85,660,997		86,971,785
Accrued interest receivable	349,903		327,170
Financial liabilities:
Noninterest-bearing deposits	(31,773,560)		(33,975,180)
Savings and interest-checking deposits	(51,108,962)		(51,698,008)
Time deposits	(5,810,587)		(6,580,962)
Deposits at Cayman Islands office	(447,287)		(177,996)
Short-term borrowings	(1,310,110)		(175,099)
Long-term borrowings	(9,140,268)		(8,141,430)
Accrued interest payable	(68,196)		(75,641)
Trading account liabilities	(308,733)		(137,390)
Other financial instruments:
Commitments to originate real estate loans for sale	4,186		8,303
Commitments to sell real estate loans	10,831		1,958
Other credit-related commitments	(129,102)		(125,281)
Interest rate swap agreements used for interest rate risk management	$ 2,446		$ 639