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Summary of Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2019
subsidiary
segment
Property, Plant and Equipment [Line Items]  
Number of wholly-owned subsidiaries | subsidiary 3
Number of reportable segments | segment 1
Finite-lived intangible assets amortization period 10 years
Furniture And Equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Useful life 3 years
Furniture And Equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Useful life 10 years
Premises | Minimum  
Property, Plant and Equipment [Line Items]  
Useful life 25 years
Premises | Maximum  
Property, Plant and Equipment [Line Items]  
Useful life 40 years