Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financial assets:
Interest-bearing deposits at banks	$ 7,602,897	$ 8,105,197
Trading account assets	276,322	185,584
Investment securities	12,536,840	12,692,813
Loans and leases:
Allowance for credit losses	(1,019,337)	(1,019,444)	$ (1,019,671)	$ (1,017,198)
Loans and leases, net	87,620,546	87,447,033
Financial liabilities:
Noninterest-bearing deposits	(29,966,753)	(32,256,668)
Savings and interest-checking deposits	(52,932,297)	(50,963,744)
Time deposits	(6,501,509)	(6,124,254)
Deposits at Cayman Islands office	(1,069,191)	(811,906)
Long-term borrowings	(8,476,024)	(8,444,914)
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,267,260	1,605,439
Interest-bearing deposits at banks	7,602,897	8,105,197
Trading account assets	276,322	185,584
Investment securities	12,536,840	12,692,813
Loans and leases:
Commercial loans and leases	23,090,204	22,977,976
Commercial real estate loans	34,690,930	34,363,556
Residential real estate loans	16,769,933	17,154,446
Consumer loans	14,088,816	13,970,499
Allowance for credit losses	(1,019,337)	(1,019,444)
Loans and leases, net	87,620,546	87,447,033
Accrued interest receivable	374,084	353,965
Financial liabilities:
Noninterest-bearing deposits	(29,966,753)	(32,256,668)
Savings and interest-checking deposits	(52,932,297)	(50,963,744)
Time deposits	(6,501,509)	(6,124,254)
Deposits at Cayman Islands office	(1,069,191)	(811,906)
Short-term borrowings	(3,602,566)	(4,398,378)
Long-term borrowings	(8,476,024)	(8,444,914)
Accrued interest payable	(80,322)	(95,274)
Trading account liabilities	(98,771)	(178,125)
Other financial instruments:
Commitments to originate real estate loans for sale	7,433	7,712
Commitments to sell real estate loans	(1,424)	(6,177)
Other credit-related commitments	(126,811)	(131,688)
Interest rate swap agreements used for interest rate risk management	(16,924)	5,530
Estimate Fair Value [Member]
Financial assets:
Cash and cash equivalents	1,267,260	1,605,439
Interest-bearing deposits at banks	7,602,897	8,105,197
Trading account assets	276,322	185,584
Investment securities	12,521,737	12,631,656
Loans and leases:
Commercial loans and leases	22,755,670	22,587,387
Commercial real estate loans	34,424,612	33,832,558
Residential real estate loans	16,764,418	16,974,545
Consumer loans	14,018,581	13,819,545
Loans and leases, net	87,963,281	87,214,035
Accrued interest receivable	374,084	353,965
Financial liabilities:
Noninterest-bearing deposits	(29,966,753)	(32,256,668)
Savings and interest-checking deposits	(52,932,297)	(50,963,744)
Time deposits	(6,598,274)	(6,201,957)
Deposits at Cayman Islands office	(1,069,191)	(811,906)
Short-term borrowings	(3,602,566)	(4,398,378)
Long-term borrowings	(8,511,141)	(8,385,289)
Accrued interest payable	(80,322)	(95,274)
Trading account liabilities	(98,771)	(178,125)
Other financial instruments:
Commitments to originate real estate loans for sale	7,433	7,712
Commitments to sell real estate loans	(1,424)	(6,177)
Other credit-related commitments	(126,811)	(131,688)
Interest rate swap agreements used for interest rate risk management	(16,924)	5,530
Estimate Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,194,318	1,528,302
Trading account assets	46,521	46,018
Investment securities	43,301	71,989
Estimate Fair Value [Member] \| Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	72,942	77,137
Interest-bearing deposits at banks	7,602,897	8,105,197
Trading account assets	229,801	139,566
Investment securities	12,378,816	12,456,467
Loans and leases:
Commercial real estate loans	166,019	346,775
Residential real estate loans	3,877,095	3,920,447
Loans and leases, net	4,043,114	4,267,222
Accrued interest receivable	374,084	353,965
Financial liabilities:
Noninterest-bearing deposits	(29,966,753)	(32,256,668)
Savings and interest-checking deposits	(52,932,297)	(50,963,744)
Time deposits	(6,598,274)	(6,201,957)
Deposits at Cayman Islands office	(1,069,191)	(811,906)
Short-term borrowings	(3,602,566)	(4,398,378)
Long-term borrowings	(8,511,141)	(8,385,289)
Accrued interest payable	(80,322)	(95,274)
Trading account liabilities	(98,771)	(178,125)
Other financial instruments:
Commitments to sell real estate loans	(1,424)	(6,177)
Interest rate swap agreements used for interest rate risk management	(16,924)	5,530
Estimate Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	99,620	103,200
Loans and leases:
Commercial loans and leases	22,755,670	22,587,387
Commercial real estate loans	34,258,593	33,485,783
Residential real estate loans	12,887,323	13,054,098
Consumer loans	14,018,581	13,819,545
Loans and leases, net	83,920,167	82,946,813
Other financial instruments:
Commitments to originate real estate loans for sale	7,433	7,712
Other credit-related commitments	$ (126,811)	$ (131,688)

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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 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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