Derivative Financial Instruments - Classification on the balance sheet for the periods indicated (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Asset Derivatives
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Interest rate swaps, Other assets	$ 23,725	$ 64,338
Derivatives not designated as hedging instruments, Other assets	24,019	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	196	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	91	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	7	0
Liability Derivatives
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivative not designated as hedging instruments, Interest rate swaps, Other liabilities	24,988	17,880
Derivatives not designated as hedging instruments, Other liabilities	25,483	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	401	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	78	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	$ 16	$ 87