Fair Value Measurements - Summary of Information about Valuation Processes Used to Determine Nonrecurring Fair Value Measurements (Detail) - Fair Value, Nonrecurring [Member] $ in Thousands		Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans		$ 2,351	$ 751
Loans Held for Sale		4,074	3,860
Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans		2,351	751	$ 2,351
Loans Held for Sale		$ 4,074	$ 3,860
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)	[1]	10	10
Fair Value, Inputs, Level 3 [Member] | Measurement Input Liquidation of Collateral Rate [Member] | Appraisal Of Collateral [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	[1]	15	15

[1] Fair value is generally determined through independent appraisals of the underlying collateral, which include various Level III inputs that are not identifiable.