Fair Value Measurement - Schedule of Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Fair Value Inputs Asset Quantitative Information [Line Items]
Other real estate owned and repossessed assets	$ 1,474	$ 1,497
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Collateral dependent loans	18,289	18,273
Other real estate owned and repossessed assets	1,474	1,497
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Collateral dependent loans	18,289	18,273
Other real estate owned and repossessed assets	$ 1,474	$ 1,497
Collateral dependent loans, Appraisal adjustments	0.00%	0.00%
Collateral dependent loans, Liquidation expenses	(8.00%)	(8.00%)
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Weighted Average [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Collateral dependent loans, Appraisal adjustments	0.00%	0.00%
Collateral dependent loans, Liquidation expenses	(8.00%)	(8.00%)