Derivative Financial Instruments - Classification on the balance sheet for the periods indicated (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Net Amount	$ 86,290	$ 18,593
Derivative Asset	24,360	64,714
Asset Derivatives
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	5	0
Derivatives not designated as hedging instruments, Interest rate swaps, Other assets	23,818	64,338
Derivatives not designated as hedging instruments, Other assets	24,355	64,714
Asset Derivatives | Risk participation agreements
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other assets	55	315
Asset Derivatives | Foreign currency exchange contracts - matched customer book
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other assets	428	61
Asset Derivatives | Foreign currency exchange contracts - foreign currency loan
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other assets	54	0
Liability Derivatives
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	3,206	0
Derivative not designated as hedging instruments, Interest rate swaps, Other liabilities	82,404	17,880
Derivatives not designated as hedging instruments, Other liabilities	83,084	18,593
Liability Derivatives | Risk participation agreements
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other liabilities	134	580
Liability Derivatives | Foreign currency exchange contracts - matched customer book
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other liabilities	414	46
Liability Derivatives | Foreign currency exchange contracts - foreign currency loan
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other liabilities	$ 132	$ 87