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Summary of Significant Accounting Policies (Additional Information) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
segment
quarter
Dec. 31, 2018
USD ($)
May 18, 2018
office
Property, Plant and Equipment [Line Items]      
Number of segments | segment 3    
Periods used to calculate general component for allowance for loan losses (in quarters) | quarter 20    
Required cash on deposit at Federal Reserve $ 24,560 $ 15,170  
Minimum      
Property, Plant and Equipment [Line Items]      
Finite-lived intangible asset, useful life 6 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Finite-lived intangible asset, useful life 10 years    
Buildings and related components | Minimum      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, useful life 10 years    
Buildings and related components | Maximum      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, useful life 40 years    
Furniture, fixtures and equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, useful life 3 years    
Furniture, fixtures and equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Premises, furniture, and equipment, useful life 10 years    
Branch Acquisition      
Property, Plant and Equipment [Line Items]      
Number of branch locations | office     5
River Valley      
Property, Plant and Equipment [Line Items]      
Fair value of mortgage servicing rights $ 663 $ 995