Derivative Financial Instruments - Company's derivative financial instruments included in OCI as follows (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Loss in OCI on derivatives	$ (72,667)	$ 0	$ (71,182)	$ 0
Gain reclassified from OCI into interest income (effective portion)	3,755	7,851	12,797	24,344
Gain recognized in income on derivatives (ineffective portion and amount excluded from effectiveness test)	0	0	0	0
Gain recognized in other income for foreign currency exchange contracts:	936	908	4,954	5,037
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain reclassified from OCI into interest income (effective portion)	3,755	7,851	12,797	24,344
Interest Income | Net Investment Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in income on derivatives (ineffective portion and amount excluded from effectiveness test)	0	0	0	0
Interest Income | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Customer-related positions:	1,035	832	4,760	4,596
Interest Income | Risk participation agreements
Derivative Instruments, Gain (Loss) [Line Items]
Customer-related positions:	38	(4)	186	260
Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in income on derivatives (ineffective portion and amount excluded from effectiveness test)	0	0	0	0
Other Income | Foreign currency exchange contracts - matched customer book
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in other income for foreign currency exchange contracts:	(1)	8	(1)	0
Other Income | Foreign currency exchange contracts - foreign currency loan
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in other income for foreign currency exchange contracts:	$ (136)	$ 72	$ 9	$ 181