v3.26.1
Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
shares in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Summary of Significant Accounting Policies [Line Items]    
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss $ 3,177,000 $ 3,171,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Securities available-for-sale, fair values Securities available-for-sale, fair values
Discount on acquired loans $ 989,418,000 $ 977,688,000
Number of Days Past Due (Day) 30 days  
Number of Days of Delinquent Loans Nonaccrual of Interest (Year) 90 years  
Minimum Number of Days Consumer Loans are Past Due for Losses to be Charged Off (Day) 120 days  
Maximum Number of Days Consumer Loans are Past Due for Losses to be Charged Off (Day) 180 days  
Number of Days Loans Secured by Residential Or Commercial Real Estate Are Past Due for Losses to Be Carged Off (Day) 180 days  
Accrued Interest Receivable, Loans $ 3,361,000 3,298,000
Maximum Loan amount indicated as risk graded $ 400,000  
Period of Time Between Issuance of Loan Commitment and Closing and Sale of Loans Lower Range (Day) 30 days  
Period of Time Between Issuance of Loan Commitments and Closing and Sale of Loans Upper Range (Day) 60 days  
Goodwill, Impairment Loss $ 0 0
Impairment of intangible assets $ 0  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0  
Advertising Expense $ 277,000 262,000
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description The CODM regularly assesses performance of the aggregated single operating and reporting segment and decides how to allocate resources based on net income calculated on the same basis as is net income reported in the Company's consolidated statements of income and other comprehensive income. The CODM is also regularly provided with expense information at a level consistent with that disclosed in the Company's consolidated statements of income and other comprehensive income.  
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] srt:ChiefExecutiveOfficerMember  
Acquired Loans    
Summary of Significant Accounting Policies [Line Items]    
Discount on acquired loans $ 5,551,000 $ 7,564,000
Core Deposits [Member]    
Summary of Significant Accounting Policies [Line Items]    
Estimated useful life 10 years  
Building [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life (Year) 40 years  
Computer Equipment [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life (Year) 3 years  
Minimum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Unallocated Surplus Percent 0.00%  
Minimum [Member] | Furniture and Fixtures [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life (Year) 3 years  
Maximum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Unallocated Surplus Percent 5.00%  
Maximum [Member] | Furniture and Fixtures [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life (Year) 10 years