Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill impairment	$ 26,800	$ 26,826	$ 0	$ 0
Goodwill		0	26,826
Accumulated amortization of intangibles		8,206	6,325
Intangible amortization		1,295	1,525	$ 1,671
Mortgage servicing asset		27,100	29,000
Loan Servicing Assets Included In Other Amortization Intangibles [Member]
Goodwill [Line Items]
Accumulated amortization of intangibles		1,300	876
Loan Servicing Assets Included In Interest And Fees On Loans [Member]
Goodwill [Line Items]
Amortization of intangible assets included in interest and fees		216	306
Intangible amortization		$ 679	$ 820