v3.26.1
Note 9 - Quantitative Information about Assets Measured at Fair Value (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Nonrecurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Asset fair value measurements $ 6,184 $ 5,441
Nonrecurring [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Asset fair value measurements 6,183 5,440
Nonrecurring [Member] | Mortgage Servicing Rights [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Asset fair value measurements 1 1
Fair Value, Inputs, Level 3 [Member] | Nonrecurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Asset fair value measurements 6,184 5,441
Fair Value, Inputs, Level 3 [Member] | Nonrecurring [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Asset fair value measurements 6,183 5,440
Fair Value, Inputs, Level 3 [Member] | Nonrecurring [Member] | Mortgage Servicing Rights [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Asset fair value measurements $ 1 $ 1
Fair Value, Inputs, Level 3 [Member] | Appraisal Valuation Technique [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Nonrecurring fair value liquidation inputs [1],[2] (10.00%) 10.00%
Fair Value, Inputs, Level 3 [Member] | Appraisal Valuation Technique [Member] | Measurement Input, Comparability Adjustment [Member] | Minimum [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Nonrecurring fair value range of value inputs [2],[3] (0.10) (0.10)
Fair Value, Inputs, Level 3 [Member] | Appraisal Valuation Technique [Member] | Measurement Input, Comparability Adjustment [Member] | Maximum [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Nonrecurring fair value range of value inputs [2],[3] (1) (1)
Fair Value, Inputs, Level 3 [Member] | Appraisal Valuation Technique [Member] | Nonrecurring [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Asset fair value measurements [2] $ 6,183 $ 5,440
Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] | Measurement Input, Expected Term [Member] | Minimum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Nonrecurring fair value expected term 2 years 7 months 6 days 2 years 9 months 18 days
Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] | Measurement Input, Expected Term [Member] | Maximum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Nonrecurring fair value expected term 28 years 9 months 18 days 29 years 1 month 6 days
Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Nonrecurring fair value range of value inputs 12.00% 12.00%
Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Nonrecurring fair value range of value inputs 12.50% 12.50%
Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] | Measurement Input, Prepayment Speeds [Member] | Minimum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Nonrecurring fair value range of value inputs 98.00% 92.00%
Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] | Measurement Input, Prepayment Speeds [Member] | Maximum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Nonrecurring fair value range of value inputs 208.00% 199.00%
Fair Value, Inputs, Level 3 [Member] | Discounted Cash Flow Valuation Technique [Member] | Nonrecurring [Member] | Mortgage Servicing Rights [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Asset fair value measurements $ 1 $ 1
[1] Appraisals and pending agreements of sale are adjusted by management for estimated liquidation expenses. The range is presented as a percentage of the initial appraised value.
[2] Fair value is primarily determined through appraisals of the underlying collateral by independent parties, which generally includes various Level 3 inputs which are not always identifiable.
[3] Appraisals may be adjusted by management for qualitative factors such as economic conditions and the age of the appraisal. The range is presented as a percentage of the initial appraised value.