Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Balance at period end	$ 0	$ 41,667
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Average balance outstanding	6,330	474
Maximum month-end balance	$ 20,833	$ 41,667
Weighted-average rate at period end	0.00%	0.35%
Weighted-average rate during the period	0.15%	0.35%