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Note 5 - Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Securities available-for-sale $ 640,416 $ 648,513
Reported Value Measurement [Member]    
Securities available-for-sale 640,416 648,513
Estimate of Fair Value Measurement [Member]    
Securities available-for-sale 640,416 648,513
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents 163,391 101,227
Interest-bearing time deposits 5,166 6,166
Accrued income receivable 12,240 13,864
Securities sold under agreements to repurchase 45,774 52,412
Accrued interest payable 2,555 3,208
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 163,391 101,227
Interest-bearing time deposits 5,034 5,938
Accrued income receivable 12,240 13,864
Securities sold under agreements to repurchase 45,774 52,412
Accrued interest payable 2,555 3,208
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
FHLB and FRB stock 3,384 3,883
Loans held for sale 540 342
Derivative financial instruments 876 996
Deposits 1,906,384 1,846,682
Other borrowings 35,802 46,952
Derivative financial instruments, liabilities 351 248
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
FHLB and FRB stock 3,384 3,883
Loans held for sale 540 342
Derivative financial instruments 876 996
Deposits 1,906,459 1,848,472
Other borrowings 35,508 46,543
Derivative financial instruments, liabilities 351 248
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans receivable 1,306,230 1,303,917
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans receivable $ 1,268,007 $ 1,261,703