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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

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