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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	Jun. 30, 2025	Dec. 31, 2024
Cash and due from banks	$ 190,011	$ 157,167
Short-term investments	1,056,964	882,353
Loans held-for-sale	13,338	0
Loans held for investment, net	20,072,336	19,500,647
Equity securities	1,539	1,539
Investment in Federal Home Loan Bank stock	17,250	17,250
Deposits	19,983,108	19,670,327
Advances from Federal Home Loan Bank	410,444	59,606
Other borrowings	15,656	15,281
Long-term debt	76,785	73,752
Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	190,011	157,167
Short-term investments	1,056,964	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	13,338
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	410,444	59,606
Other borrowings	0	0
Long-term debt	76,785	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	20,072,336	19,500,647
Equity securities	1,539	1,539
Investment in Federal Home Loan Bank stock	0	0
Deposits	19,983,108	19,670,327
Advances from Federal Home Loan Bank	0	0
Other borrowings	15,656	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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