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Note 6 - Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Securities available for sale $ 657,410 $ 686,080
Fair Value, Inputs, Level 1 [Member]    
Securities available for sale 0 0
Fair Value, Inputs, Level 2 [Member]    
Securities available for sale 657,410 686,080
Fair Value, Inputs, Level 3 [Member]    
Securities available for sale 0 0
Reported Value Measurement [Member]    
Cash and due from banks 10,957 8,768
Interest-bearing deposits 79,466 130,021
Securities available for sale 657,410 686,080
Restricted securities 941 845
Loans, net 844,656 795,574
Accrued interest receivable 5,822 5,104
Bank-owned life insurance 43,072 42,354
Interest rate loan contracts 9  
Deposits 1,570,649 1,494,587
Accrued interest payable 40 48
Interest rate loan contracts 9  
Mortgage loans held for sale   615
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 10,957 8,768
Interest-bearing deposits 79,466 130,021
Securities available for sale 0 0
Restricted securities 0 0
Loans, net 0 0
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Interest rate loan contracts 0  
Deposits 0 0
Accrued interest payable 0 0
Interest rate loan contracts 0  
Mortgage loans held for sale   0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and due from banks 0 0
Interest-bearing deposits 0 0
Securities available for sale 657,410 686,080
Restricted securities 941 845
Loans, net 0 0
Accrued interest receivable 5,822 5,104
Bank-owned life insurance 43,072 42,354
Interest rate loan contracts 0  
Deposits 1,493,626 1,415,619
Accrued interest payable 40 48
Interest rate loan contracts 0  
Mortgage loans held for sale   615
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and due from banks 0 0
Interest-bearing deposits 0 0
Securities available for sale 0 0
Restricted securities 0 0
Loans, net 801,779 791,335
Accrued interest receivable 0 0
Bank-owned life insurance 0 0
Interest rate loan contracts 9  
Deposits 76,946 79,115
Accrued interest payable 0 0
Interest rate loan contracts $ 9  
Mortgage loans held for sale   $ 0