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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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E + Details
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