Note 8 - Deposits - Summary of Deposits (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Noninterest-bearing demand | $ 2,910,281 | $ 2,684,272 |
| Interest-bearing checking | 9,817,320 | 10,034,713 |
| Savings | 107,288 | 110,298 |
| Time deposits, $250,000 and under | 312,177 | 369,855 |
| Time deposits, over $250,000 | 940,312 | 1,019,896 |
| Total deposits | $ 14,087,378 | $ 14,219,034 |
| X | ||||||||||
- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that are below the Federal Deposit Insurance Corporation (FDIC) insurance limit. No definition available.
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| X | ||||||||||
- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of interest-bearing domestic checking deposit liabilities. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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