Summary of Significant Accounting Policies - Schedule of Range of Estimated Useful Lives for Premises and Equipment (Detail)	12 Months Ended
	Dec. 31, 2021
Minimum [Member] | Building and Improvements [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	20 years
Minimum [Member] | Furniture Automobiles and Equipment [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	5 days
Maximum [Member] | Building and Improvements [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	40 days
Maximum [Member] | Furniture Automobiles and Equipment [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	10 days