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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	Mar. 31, 2025	Dec. 31, 2024
Cash and due from banks	$ 175,027	$ 157,167
Short-term investments	1,209,487	882,353
Loans held-for-sale	11,759	0
Loans held for investment, net	19,563,984	19,500,647
Equity securities	1,539	1,539
Investment in Federal Home Loan Bank stock	17,250	17,250
Deposits	19,795,020	19,670,327
Advances from Federal Home Loan Bank	94,645	59,606
Other borrowings	15,446	15,281
Long-term debt	74,944	73,752
Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	175,027	157,167
Short-term investments	1,209,487	882,353
Loans held-for-sale	0
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-sale	11,759
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	94,645	59,606
Other borrowings	0	0
Long-term debt	74,944	73,752
Fair Value, Inputs, Level 3 [Member]
Cash and due from banks	0	0
Short-term investments	0	0
Loans held-for-sale	0
Loans held for investment, net	19,563,984	19,500,647
Equity securities	1,539	1,539
Investment in Federal Home Loan Bank stock	0	0
Deposits	19,795,020	19,670,327
Advances from Federal Home Loan Bank	0	0
Other borrowings	15,446	15,281
Long-term debt	$ 0	$ 0

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-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(8))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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