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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended 39 Months Ended
Dec. 31, 2022
USD ($)
Segment
Apartment
unit
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2021
Number of reportable segments | Segment 1      
Cash reserve balances $ 0 $ 0    
Loan balance $ 768,500,000 $ 1,000,000,000    
Disposal Group, Not Discontinued Operation, Gain Loss On Disposal, Statement Of Income, Extensible List, Not Disclosed Flag current operations current operations    
Bank premises and equipment held for sale $ 1,300,000 $ 3,900,000    
Number of reporting units | unit 1      
Goodwill and intangible asset impairment $ 0 $ 0 $ 0  
Finance Lease, Liability, Statement of Financial Position [Extensible List] Long-term debt Long-term debt    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets    
Customer Lists Intangible        
Core deposit intangible, amortization period 20 years      
Enola, Pennsylvania        
Carrying value of investment in limited partnership $ 58,000 $ 102,000    
Investment in subsidiaries $ 58,000 102,000    
Dauphin County, Pennsylvania        
Number of apartments under the project | Apartment 37      
Limited partner capital contribution commitment $ 7,600,000      
Commitment funding term       3 years
Project investment amortization period 10 years      
LIHTCs amount awarded for the project $ 8,500,000      
Low income housing tax credit 853,000 853,000 74,000  
Dauphin County, Pennsylvania | Other Assets        
Carrying value of investment in limited partnership 5,200,000 6,000,000    
Investment in subsidiaries 5,200,000 6,000,000    
Federal Home Loan Bank of Pittsburgh        
Other interest and dividend income 289,000 345,000 360,000  
Reserve for Off-balance Sheet Activities        
Valuation allowances and reserves, balance 85,000 72,000    
Equity securities | Accounting Standards Update 2016-01        
Equity securities, fair value 430,000 500,000    
Equity securities sold $ 0 $ 0 $ 0  
Maximum        
Non-residential consumer loans charged off on contractual basis in event of bankruptcy, in period 120 days      
Maximum | Core Deposit Intangible        
Core deposit intangible, amortization period 10 years      
Maximum | Building Assets        
Property, plant and equipment, useful life 50 years      
Maximum | Furniture, fixtures, and equipment        
Property, plant and equipment, useful life 10 years      
Maximum | Land Improvements        
Property, plant and equipment, useful life 20 years      
Maximum | Leasehold improvements        
Property, plant and equipment, useful life 15 years      
Minimum | Building Assets        
Property, plant and equipment, useful life 5 years      
Minimum | Furniture, fixtures, and equipment        
Property, plant and equipment, useful life 3 years      
Minimum | Land Improvements        
Property, plant and equipment, useful life 10 years      
Minimum | Leasehold improvements        
Property, plant and equipment, useful life 10 years