Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 36,648	$ 36,648
Accumulated Amortization	(17,545)	(16,665)
Net Carrying Amount	19,103	19,983
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,298	33,298
Accumulated Amortization	(14,465)	(13,615)
Net Carrying Amount	18,833	19,683
Customer Relationship Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,350	3,350
Accumulated Amortization	(3,080)	(3,050)
Net Carrying Amount	$ 270	$ 300