Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Short-term borrowings	$ 0	$ 1,100
Weighted average interest rate	0.08%	0.30%
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Short-term borrowings		$ 1,100
Short-term Debt [Member]
Short-term Debt [Line Items]
End of period interest rate	0.10%	0.05%