Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Tax basis of loans in excess of financial statement basis	$ 21,546	$ 19,474
Recognized for financial reporting purposes but not yet for tax purposes: Deferred compensation	3,525	3,303
Net unrealized loss on investment securities available-for-sale	107,206	142,276
Other deferred tax assets	727	1,038
Total deferred tax assets	133,004	166,091
Deferred tax liabilities:
Financial statement basis of fixed assets in excess of tax basis	7,164	6,019
Intangible asset amortization deductible for tax purposes, but not for financial reporting purposes	14,207	13,866
Recognized for financial reporting purposes but not yet for tax purposes - accretion on investment securities	718	644
Other deferred tax liabilities	115	51
Total deferred tax liabilities	22,204	20,580
Net deferred tax asset (liability)	$ 110,800	$ 145,511