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Note 5 - Fair Value Measurements - Estimated Fair Value of the Company's Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Reported Value Measurement [Member]    
Financial assets:    
Net loans $ 1,475,909 $ 1,456,437
Mortgage servicing rights 1,554 1,636
Financial liabilities:    
Non-maturing deposits 1,141,668 1,092,287
Time deposits 327,876 334,315
Other borrowings 11,762 11,862
Estimate of Fair Value Measurement [Member]    
Financial assets:    
Net loans 1,418,616 1,370,657
Mortgage servicing rights 2,642 2,781
Financial liabilities:    
Non-maturing deposits 1,141,668 1,092,287
Time deposits 327,876 331,638
Other borrowings 11,762 11,862
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets:    
Net loans 0 0
Mortgage servicing rights
Financial liabilities:    
Non-maturing deposits 1,141,668 1,092,287
Time deposits 0 0
Other borrowings 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Financial assets:    
Net loans 0 0
Mortgage servicing rights
Financial liabilities:    
Non-maturing deposits 0 0
Time deposits 0 0
Other borrowings 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial assets:    
Net loans 1,418,616 1,370,657
Mortgage servicing rights 2,642 2,781
Financial liabilities:    
Non-maturing deposits 0 0
Time deposits 327,876 331,638
Other borrowings $ 11,762 $ 11,862