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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Financial assets:            
Interest-bearing deposits at banks $ 8,791,753   $ 8,105,197      
Trading account assets 479,403   185,584      
Investment securities 11,580,249   12,692,813      
Loans and leases:            
Allowance for credit losses (1,029,867) $ (1,019,337) (1,019,444) $ (1,019,248) $ (1,019,671) $ (1,017,198)
Loans and leases, net 88,848,191   87,447,033      
Financial liabilities:            
Noninterest-bearing deposits (30,747,946)   (32,256,668)      
Savings and interest-checking deposits (53,221,672)   (50,963,744)      
Time deposits (6,346,551)   (6,124,254)      
Deposits at Cayman Islands office (1,364,855)   (811,906)      
Long-term borrowings (7,655,507)   (8,444,914)      
Carrying Amount [Member]            
Financial assets:            
Cash and cash equivalents 1,271,611   1,605,439      
Interest-bearing deposits at banks 8,791,753   8,105,197      
Trading account assets 479,403   185,584      
Investment securities 11,580,249   12,692,813      
Loans and leases:            
Commercial loans and leases 23,431,408   22,977,976      
Commercial real estate loans 35,194,375   34,363,556      
Residential real estate loans 16,693,737   17,154,446      
Consumer loans 14,558,538   13,970,499      
Allowance for credit losses (1,029,867)   (1,019,444)      
Loans and leases, net 88,848,191   87,447,033      
Accrued interest receivable 362,012   353,965      
Financial liabilities:            
Noninterest-bearing deposits (30,747,946)   (32,256,668)      
Savings and interest-checking deposits (53,221,672)   (50,963,744)      
Time deposits (6,346,551)   (6,124,254)      
Deposits at Cayman Islands office (1,364,855)   (811,906)      
Short-term borrowings (4,611,390)   (4,398,378)      
Long-term borrowings (7,655,507)   (8,444,914)      
Accrued interest payable (108,971)   (95,274)      
Trading account liabilities (73,392)   (178,125)      
Other financial instruments:            
Commitments to originate real estate loans for sale 17,200   7,712      
Commitments to sell real estate loans (23,447)   (6,177)      
Other credit-related commitments (127,699)   (131,688)      
Interest rate swap agreements used for interest rate risk management (5,780)   5,530      
Estimate Fair Value [Member]            
Financial assets:            
Cash and cash equivalents 1,271,611   1,605,439      
Interest-bearing deposits at banks 8,791,753   8,105,197      
Trading account assets 479,403   185,584      
Investment securities 11,606,174   12,631,656      
Loans and leases:            
Commercial loans and leases 23,095,155   22,587,387      
Commercial real estate loans 34,932,104   33,832,558      
Residential real estate loans 16,734,846   16,974,545      
Consumer loans 14,537,432   13,819,545      
Loans and leases, net 89,299,537   87,214,035      
Accrued interest receivable 362,012   353,965      
Financial liabilities:            
Noninterest-bearing deposits (30,747,946)   (32,256,668)      
Savings and interest-checking deposits (53,221,672)   (50,963,744)      
Time deposits (6,447,027)   (6,201,957)      
Deposits at Cayman Islands office (1,364,855)   (811,906)      
Short-term borrowings (4,611,390)   (4,398,378)      
Long-term borrowings (7,703,957)   (8,385,289)      
Accrued interest payable (108,971)   (95,274)      
Trading account liabilities (73,392)   (178,125)      
Other financial instruments:            
Commitments to originate real estate loans for sale 17,200   7,712      
Commitments to sell real estate loans (23,447)   (6,177)      
Other credit-related commitments (127,699)   (131,688)      
Interest rate swap agreements used for interest rate risk management (5,780)   5,530      
Estimate Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]            
Financial assets:            
Cash and cash equivalents 1,214,826   1,528,302      
Trading account assets 47,344   46,018      
Investment securities 109,377   71,989      
Estimate Fair Value [Member] | Significant Observable Inputs (Level 2) [Member]            
Financial assets:            
Cash and cash equivalents 56,785   77,137      
Interest-bearing deposits at banks 8,791,753   8,105,197      
Trading account assets 432,059   139,566      
Investment securities 11,400,933   12,456,467      
Loans and leases:            
Commercial real estate loans 503,599   346,775      
Residential real estate loans 3,965,011   3,920,447      
Loans and leases, net 4,468,610   4,267,222      
Accrued interest receivable 362,012   353,965      
Financial liabilities:            
Noninterest-bearing deposits (30,747,946)   (32,256,668)      
Savings and interest-checking deposits (53,221,672)   (50,963,744)      
Time deposits (6,447,027)   (6,201,957)      
Deposits at Cayman Islands office (1,364,855)   (811,906)      
Short-term borrowings (4,611,390)   (4,398,378)      
Long-term borrowings (7,703,957)   (8,385,289)      
Accrued interest payable (108,971)   (95,274)      
Trading account liabilities (73,392)   (178,125)      
Other financial instruments:            
Commitments to sell real estate loans (23,447)   (6,177)      
Interest rate swap agreements used for interest rate risk management (5,780)   5,530      
Estimate Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]            
Financial assets:            
Investment securities 95,864   103,200      
Loans and leases:            
Commercial loans and leases 23,095,155   22,587,387      
Commercial real estate loans 34,428,505   33,485,783      
Residential real estate loans 12,769,835   13,054,098      
Consumer loans 14,537,432   13,819,545      
Loans and leases, net 84,830,927   82,946,813      
Other financial instruments:            
Commitments to originate real estate loans for sale 17,200   7,712      
Other credit-related commitments $ (127,699)   $ (131,688)