Derivative Financial Instruments - Classification on the balance sheet for the periods indicated (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Net Amount	$ 78,956	$ 81,422
Derivative Asset	22,434	23,861
Asset Derivatives
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	1,378	16
Derivatives not designated as hedging instruments, Interest rate swaps, Other assets	20,842	23,567
Derivatives not designated as hedging instruments, Other assets	21,056	23,845
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	96	78
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	118	198
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	0	2
Liability Derivatives
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	25	2,417
Derivative not designated as hedging instruments, Interest rate swaps, Other liabilities	78,464	78,577
Derivatives not designated as hedging instruments, Other liabilities	78,931	79,005
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	119	130
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	105	205
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	$ 243	$ 93