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Note 11 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Cash and cash equivalents | $ 142,372 | $ 123,430 | [1]
Held to maturity debt securities, fair value | 673,023 | 907,191 |
Federal funds sold | 3,542 | 100,575 | [1]
Mortgage loans held for sale | 8,453 | 5,074 | [1]
Restricted equity securities | 11,300 | 10,226 | [1]
Net Loans | 12,177,471 | 11,505,512 | [1]
Federal funds purchased | 1,542,623 | 1,256,724 | [1]
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member] |  |  |
Cash and cash equivalents | 1,756,689 | 2,030,513 |
Held to maturity debt securities, fair value | 249,349 | 508,985 |
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Cash and cash equivalents | 1,756,689 | 2,030,513 |
Held to maturity debt securities, fair value | 233,123 | 484,267 |
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] |  |  |
Held to maturity debt securities, fair value | 478,981 | 473,429 |
Federal funds sold | 3,542 | 100,575 |
Mortgage loans held for sale | 8,453 | 5,071 |
Restricted equity securities | 11,300 | 10,226 |
Deposits | 13,146,529 | 13,273,511 |
Federal funds purchased | 1,542,623 | 1,256,724 |
Other borrowings | 64,741 | 64,735 |
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Held to maturity debt securities, fair value | 439,650 | 422,674 |
Federal funds sold | 3,542 | 100,575 |
Mortgage loans held for sale | 8,453 | 5,071 |
Restricted equity securities | 11,300 | 10,226 |
Deposits | 13,145,438 | 13,266,640 |
Federal funds purchased | 1,542,623 | 1,256,724 |
Other borrowings | 58,861 | 58,083 |
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member] |  |  |
Held to maturity debt securities, fair value | 250 | 250 |
Net Loans | 12,177,471 | 11,505,512 |
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Held to maturity debt securities, fair value | 250 | 250 |
Net Loans | $ 11,826,898 | $ 11,032,819 |
[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/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 Reference 2: 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 3: 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 Amount of restricted investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477220/954-210-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478600/954-210-50-2 + Details
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- Definition The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements. + 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(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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