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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 ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Cash and due from banks	$ 166,167	$ 157,167
Short-term investments	1,141,886	882,353
Loans held for investment, net	20,447,466	19,500,647
Equity securities	1,539	1,539
Investment in Federal Home Loan Bank stock	17,250	17,250
Deposits	20,506,029	19,670,327
Advances from Federal Home Loan Bank	189,312	59,606
Other borrowings	15,338	15,281
Long-term debt	78,627	73,752
Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	166,167	157,167
Short-term investments	1,141,886	882,353
Loans held for investment, net	0	0
Equity securities	0	0
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
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	17,250
Deposits	0	0
Advances from Federal Home Loan Bank	189,312	59,606
Other borrowings	0	0
Long-term debt	78,627	73,752
Fair Value, Inputs, Level 3 [Member]
Cash and due from banks	0	0
Short-term investments	0	0
Loans held for investment, net	20,447,466	19,500,647
Equity securities	1,539	1,539
Investment in Federal Home Loan Bank stock	0	0
Deposits	20,506,029	19,670,327
Advances from Federal Home Loan Bank	0	0
Other borrowings	15,338	15,281
Long-term debt	$ 0	$ 0

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