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Note 4 - Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Securities available-for-sale $ 650,660 $ 648,513
Reported Value Measurement [Member]    
Securities available-for-sale 650,660 648,513
Estimate of Fair Value Measurement [Member]    
Securities available-for-sale 650,660 648,513
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents 108,161 101,227
Interest-bearing time deposits 5,678 6,166
Accrued income receivable 15,001 13,864
Securities sold under agreements to repurchase 40,623 52,412
Accrued interest payable 2,485 3,208
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 108,161 101,227
Interest-bearing time deposits 5,627 5,938
Accrued income receivable 15,001 13,864
Securities sold under agreements to repurchase 40,623 52,412
Accrued interest payable 2,485 3,208
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
FHLB and FRB stock 2,891 3,883
Loans held for sale 888 342
Derivative financial instruments 815 996
Deposits 1,832,819 1,846,682
Other borrowings 23,502 46,952
Derivative financial instruments, liabilities 409 248
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
FHLB and FRB stock 2,891 3,883
Loans held for sale 888 342
Derivative financial instruments 815 996
Deposits 1,833,160 1,848,472
Other borrowings 23,351 46,543
Derivative financial instruments, liabilities 409 248
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans receivable 1,275,794 1,303,917
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans receivable $ 1,242,375 $ 1,261,703