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Note 12 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - Estimate of Fair Value Measurement [Member] - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Cash and due from banks $ 160,389,000 $ 173,988,000
Short-term investments 944,612,000 654,813,000
Loans held for investment, net 19,530,559,000 19,605,152,000
Equity securities 29,949 40,406
Investment in Federal Home Loan Bank stock 17,250,000 17,746,000
Deposits 19,775,767,000 19,347,070,000
Advances from Federal Home Loan Bank 164,997,000 536,996,000
Other borrowings 15,339,000 13,978,000
Long-term debt 74,294,000 72,304,000
Loans held for investment, net 19,530,559,000 19,605,152,000
Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 160,389,000 173,988,000
Short-term investments 944,612,000 654,813,000
Loans held for investment, net 0 0
Equity securities 29,949 40,406
Investment in Federal Home Loan Bank stock 0 0
Deposits 0 0
Advances from Federal Home Loan Bank 0 0
Other borrowings 0 0
Long-term debt 0 0
Loans held for investment, net 0 0
Fair Value, Inputs, Level 2 [Member]    
Cash and due from banks 0 0
Short-term investments 0 0
Loans held for investment, net 0 0
Equity securities 0 0
Investment in Federal Home Loan Bank stock 17,250,000 17,746,000
Deposits 0 0
Advances from Federal Home Loan Bank 164,997,000 536,996,000
Other borrowings 0 0
Long-term debt 74,294,000 72,304,000
Loans held for investment, net 0 0
Fair Value, Inputs, Level 3 [Member]    
Cash and due from banks 0 0
Short-term investments 0 0
Loans held for investment, net 19,530,559,000 19,605,152,000
Equity securities 0 0
Investment in Federal Home Loan Bank stock 0 0
Deposits 19,775,767,000 19,347,070,000
Advances from Federal Home Loan Bank 0 0
Other borrowings 15,339,000 13,978,000
Long-term debt 0 0
Loans held for investment, net $ 19,530,559,000 $ 19,605,152,000