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Note 5 - Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Securities available-for-sale $ 758,520 $ 786,438  
Reported Value Measurement [Member]      
Securities available-for-sale 758,520   $ 786,438
Estimate of Fair Value Measurement [Member]      
Securities available-for-sale 758,520   786,438
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]      
Cash and cash equivalents 93,299   27,884
Interest-bearing time deposits 11,114   14,669
Accrued income receivable 10,560   11,275
Securities sold under agreements to repurchase 48,081   40,676
Accrued interest payable 2,334   666
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]      
Cash and cash equivalents 93,299   27,884
Interest-bearing time deposits 10,396   14,340
Accrued income receivable 10,560   11,275
Securities sold under agreements to repurchase 48,081   40,676
Accrued interest payable 2,334   666
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]      
FHLB and FRB stock 4,007   4,613
Loans receivable 1,232,772   1,226,011
Loans held for sale 652   154
Derivative financial instruments 1,152   1,096
Deposits 1,863,277   1,897,957
Other borrowings 97,400   39,120
Derivative financial instruments 51   0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]      
FHLB and FRB stock 4,007   4,613
Loans receivable 1,173,428   1,170,948
Loans held for sale 652   154
Derivative financial instruments 1,152   1,096
Deposits 1,861,647   1,895,473
Other borrowings 96,666   38,991
Derivative financial instruments $ 51   $ 0