v3.26.1
Note 11 - Benefits Plans (Details Textual)
 12 Months Ended
Dec. 31, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Employee Stock Ownership Plan (ESOP), Shares in ESOP (in shares) | shares 161,126 75,080
Split-dollar Life Insurance Policies, Initial Cash Outlay   $ 0
Northumberland Bancorp [Member]    
Split-dollar Life Insurance Policies, Initial Cash Outlay $ 14,850,000  
Supplemental Employee Retirement Plan [Member]    
Deferred Compensation Arrangement with Individual, Compensation Expense $ 172,000 90,000
Defined Benefit Plan, Minimum Age 65  
Liability, Defined Benefit Plan $ 1,640,000 1,520,000
Postemployment Retirement Benefits [Member]    
Liability, Defined Benefit Plan 1,430,000 843,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 76,000 5,000
Postretirement Life Insurance [Member]    
Cash Surrender Value of Life Insurance 28,230,000 12,970,000
Postretirement Life Insurance [Member] | Director [Member]    
Liability, Defined Benefit Plan $ 100,000  
Postretirement Life Insurance [Member] | Executive Officer [Member]    
Defined Benefit Plan, Liability, Multiplier of Salary 3  
Deferred Compensation, Excluding Share-Based Payments and Retirement Benefits [Member]    
Deferred Compensation Arrangement with Individual, Maximum Contractual Term (Year) 10 years  
Deferred Compensation Arrangement with Individual, Recorded Liability $ 912,000 890,000
Deferred Compensation Arrangement with Individual, Compensation Expense $ 81,000 89,000
Employee Stock Option Plan [Member]    
Employee Stock Ownership Plan, Requisite Service Period (Year) 1 year  
Employee Stock Ownership Plan, Requisite Service Hours 1,000  
Employee Stock Ownership Plan, Minimum Age 21  
Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP $ 488,000 $ 131,000
Employee Stock Ownership Plan, Period of Service, Vesting Ratably (Year) 2 years  
Employee Stock Ownership Plan, Period of Service, Fully Vested (Year) 6 years  
Employee Stock Ownership Plan (ESOP), Shares in ESOP (in shares) | shares 161,126 75,080
Section 401(k) Plan [Member]    
Defined Contribution Plan, Requisite Service Period (Year) 1 year  
Defined Contribution Plan, Requisite Service Hours 1,000  
Defined Contribution Plan, Minimum Age 21  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 4.00%  
Defined Contribution Plan, Cost $ 280,000 $ 174,000
Profit-sharing Employer Contribution Component to the 401(k) Plan [Member]    
Defined Contribution Plan, Cost $ 14,000 $ 177,000
Defined Contribution Plan, Period of Service, Vesting Ratably (Year) 2 years  
Defined Contribution Plan, Period of Service, Fully Vested (Year) 6 years