Summary of Significant Accounting Policies - Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2021
Equipment, Furniture And Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Equipment, Furniture And Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Premises | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Premises | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	50 years
Software
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Leasehold Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Leasehold Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years