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Note 5 - Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Securities available-for-sale $ 688,595 $ 736,389
Reported Value Measurement [Member]    
Securities available-for-sale 688,595 736,389
Estimate of Fair Value Measurement [Member]    
Securities available-for-sale 688,595 736,389
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents 58,969 55,101
Interest-bearing time deposits 6,167 8,904
Accrued income receivable 15,261 12,953
Securities sold under agreements to repurchase 42,756 53,994
Accrued interest payable 3,045 4,710
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 58,969 55,101
Interest-bearing time deposits 5,924 8,444
Accrued income receivable 15,261 12,953
Securities sold under agreements to repurchase 42,756 53,994
Accrued interest payable 3,045 4,710
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
FHLB and FRB stock 5,186 3,086
Loans held for sale 338 124
Derivative financial instruments 1,097 1,225
Deposits 1,801,721 1,811,831
Other borrowings 83,101 110,588
Derivative financial instruments, liabilities 878 745
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
FHLB and FRB stock 5,186 3,086
Loans held for sale 338 124
Derivative financial instruments 1,097 1,225
Deposits 1,804,339 1,812,718
Other borrowings 83,177 110,376
Derivative financial instruments, liabilities 878 745
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans receivable 1,295,773 1,277,812
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans receivable $ 1,257,876 $ 1,224,446