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Note 12 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Cash and cash equivalents | $ 140,659 | $ 116,394 | [1]
Held to maturity debt securities, fair value | 630,105 | 639,496 |
Federal funds sold | 6,000 | 1,045 | [1]
Mortgage loans held for sale | 22,131 | 9,211 | [1]
Restricted equity securities | 12,156 | 11,300 | [1]
Federal funds purchased | 1,599,135 | 1,993,728 | [1]
Reported Value Measurement [Member] |  |  |
Cash and cash equivalents | 1,704,904 | 2,375,589 |
Federal funds sold | 6,000 | 1,045 |
Mortgage loans held for sale | 22,131 | 9,211 |
Restricted equity securities | 12,156 | 11,300 |
Loans, net | 13,062,601 | 12,441,378 |
Deposits | 13,862,319 | 13,543,459 |
Federal funds purchased | 1,599,135 | 1,993,728 |
Other borrowings | 64,747 | 64,743 |
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Held to maturity debt securities, fair value | 249,511 | 249,403 |
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Held to maturity debt securities, fair value | 436,641 | 465,200 |
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Held to maturity debt securities, fair value | 500 | 250 |
Estimate of Fair Value Measurement [Member] |  |  |
Cash and cash equivalents | 1,704,904 | 2,375,589 |
Federal funds sold | 6,000 | 1,045 |
Mortgage loans held for sale | 22,131 | 9,211 |
Restricted equity securities | 12,156 | 11,300 |
Loans, net | 12,776,566 | 12,013,721 |
Deposits | 13,860,040 | 13,540,438 |
Federal funds purchased | 1,599,135 | 1,993,728 |
Other borrowings | 59,669 | 59,130 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and cash equivalents | 1,704,904 | 2,375,589 |
Held to maturity debt securities, fair value | 236,162 | 229,771 |
Federal funds sold | 0 | 0 |
Mortgage loans held for sale | 0 | 0 |
Restricted equity securities | 0 | 0 |
Loans, net | 0 | 0 |
Deposits | 0 | 0 |
Federal funds purchased | 0 | 0 |
Other borrowings | 0 | 0 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and cash equivalents | 0 | 0 |
Held to maturity debt securities, fair value | 393,443 | 409,475 |
Federal funds sold | 6,000 | 1,045 |
Mortgage loans held for sale | 22,131 | 9,211 |
Restricted equity securities | 12,156 | 11,300 |
Loans, net | 0 | 0 |
Deposits | 13,860,040 | 13,540,438 |
Federal funds purchased | 1,599,135 | 1,993,728 |
Other borrowings | 59,669 | 59,130 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Cash and cash equivalents | 0 | 0 |
Held to maturity debt securities, fair value | 500 | 250 |
Federal funds sold | 0 | 0 |
Mortgage loans held for sale | 0 | 0 |
Restricted equity securities | 0 | 0 |
Loans, net | 12,776,566 | 12,013,721 |
Deposits | 0 | 0 |
Federal funds purchased | 0 | 0 |
Other borrowings | $ 0 | $ 0 |
[1] | Derived from audited financial statements.

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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + 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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