Fair Value Measurements - Summary of Information about Valuation Processes Used to Determine Nonrecurring Fair Value Measurements (Detail) - Fair Value, Nonrecurring [Member] $ in Thousands	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	$ 2,844	$ 988
Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	$ 2,844	$ 988
Fair Value, Inputs, Level 3 [Member] | Measurement Input Liquidation Expenses Rate [Member] | Appraisal Of Collateral [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	10	10