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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
 12 Months Ended 15 Months Ended
Dec. 31, 2024
USD ($)
segment
apartment
shop
property
unit
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2021
Dec. 31, 2021
USD ($)
Number of reportable segments | segment 1        
Cash reserve balances $ 0 $ 0      
Accrued interest, after allowance for credit loss 1,200        
Held to maturity, at amortized cost 382,447 399,128      
Held-to-maturity, accrued Interest, after allowance for credit loss $ 1,800        
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] Payments for (Proceeds from) Investment in Tax Credits and Other Partnerships        
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Other        
Net loans $ 0 $ 324,500      
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 $ 702 $ 974      
Proceeds from sale of buildings $ 272        
Number of property available for sale | property 1        
Number of reporting units | unit 1        
Trust assets and income earned $ 473,500        
Goodwill and intangible asset impairment $ 0 $ 0 $ 0    
Finance Lease, Liability, Statement of Financial Position [Extensible List] Long-term debt Long-term debt      
Decrease in retained earnings $ (655,018) $ (542,350) (512,099)   $ (490,076)
Deferred income taxes 22,747 24,146      
Off-balance-sheet credit exposure 2,939 3,567 85    
Retained Earnings          
Decrease in retained earnings (181,597) (145,982) (133,114)   $ (91,043)
Cumulative Effect, Period of Adoption, Adjustment          
Allowance for loan losses     15,000    
Decrease in retained earnings [1]     11,548    
Deferred income taxes     3,100    
Off-balance-sheet credit exposure     3,100    
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings          
Decrease in retained earnings [1]     11,548    
Enola, Pennsylvania          
Carrying value of investment in limited partnership $ 0 15      
Dauphin County, Pennsylvania          
Number of apartments under the project | apartment 37        
Carrying value of investment in limited partnership $ 3,700 4,500      
Limited partner capital contribution commitment $ 7,600        
Commitment funding term (in years)       3 years  
Project investment amortization period (in years) 10 years        
LIHTCs amount awarded for the project $ 8,500        
Low income housing tax credit 2,200 1,300 853    
Mechanicsburg, Pennsylvania          
Carrying value of investment in limited partnership $ 9,700 8,900      
Project investment amortization period (in years) 10 years        
LIHTCs amount awarded for the project $ 12,000        
Low income housing tax credit $ 1,100 0      
Schuylkill County, Pennsylvania          
Number of apartments under the project | apartment 17        
Number of shops under the project | shop 2        
Carrying value of investment in limited partnership $ 3,100 3,300      
Limited partner capital contribution commitment $ 4,400        
Project investment amortization period (in years) 10 years        
LIHTCs amount awarded for the project $ 4,800        
Low income housing tax credit 484 484      
Federal Home Loan Bank of Pittsburgh          
Other interest and dividend income 1,300 864 289    
Equity securities          
Equity securities, fair value 428 438      
Equity securities sold $ 0 $ 0 $ 0    
Maximum | Core Deposit Intangible          
Core deposit intangible, amortization period (in years) 10 years        
Maximum | Customer Lists Intangible          
Core deposit intangible, amortization period (in years) 20 years        
Maximum | Building Assets          
Property, plant and equipment, useful life (in years) 50 years        
Maximum | Furniture, fixtures, and equipment          
Property, plant and equipment, useful life (in years) 10 years        
Maximum | Land Improvements          
Property, plant and equipment, useful life (in years) 20 years        
Maximum | Leasehold improvements          
Property, plant and equipment, useful life (in years) 15 years        
Minimum | Customer Lists Intangible          
Core deposit intangible, amortization period (in years) 10 years        
Minimum | Building Assets          
Property, plant and equipment, useful life (in years) 5 years        
Minimum | Furniture, fixtures, and equipment          
Property, plant and equipment, useful life (in years) 3 years        
Minimum | Land Improvements          
Property, plant and equipment, useful life (in years) 10 years        
Minimum | Leasehold improvements          
Property, plant and equipment, useful life (in years) 10 years        
[1] The Corporation adopted ASC 326, Financial Instruments - Credit Losses, effective January 1, 2023. See "Note 1 - Summary of Significant Accounting Policies" for further details.