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Note 15 - Income Taxes - Reconciliation From Federal Income Tax Statutory Rates to Income Before Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Income tax at statutory federal rate, amount | $ 71,848 |  | $ 58,585 |  | $ 51,363 |
Income tax at statutory federal rate, percentage | 21.00% |  | 21.00% |  | 21.00% |
State income tax, net of federal tax effect, amount | $ 5,023 | [1] | $ 1,787 |  | $ 3,339 |
State income tax, net of federal tax effect, percentage | 1.47% | [1] | 0.64% |  | 1.37% |
Energy tax credits, amount | $ (4,500) |  |  |  |  |
Tax-exempt income, net of expenses, amount |  |  | $ (14) |  | $ (92) |
Energy tax credits, percentage | (1.32%) |  |  |  |  |
Tax-exempt income, net of expenses, pre-tax earnings |  |  | (0.01%) |  | (0.04%) |
Other credits, amount | $ (4,592) |  |  |  |  |
Bank owned life insurance contracts, amount |  |  | $ (2,002) |  | $ (1,591) |
Other credits, percentage | (1.34%) |  |  |  |  |
Bank owned life insurance contracts, pre-tax earnings |  |  | (0.72%) |  | (0.65%) |
Nontaxable or nondeductible items, amount | $ (2,863) |  |  |  |  |
Excess tax benefit from stock compensation, amount |  |  | $ (1,117) |  | $ (1,242) |
Nontaxable or nondeductible items, percentage | (0.84%) |  |  |  |  |
Excess tax benefit from stock compensation, pre-tax earnings |  |  | (0.40%) |  | (0.51%) |
Change in unrecognized tax positions, amount | $ 176 |  |  |  |  |
Federal tax credits, net of related amortization, amount |  |  | $ (6,297) |  | $ (16,002) |
Change in unrecognized tax positions, percentage | 0.05% |  |  |  |  |
Federal tax credits, net of related amortization, pre-tax earnings |  |  | (2.26%) |  | (6.54%) |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ 435 |  |  |  |  |
Other, amount |  |  | $ 798 |  | $ 1,960 |
Other, percentage | 0.13% |  | 0.36% |  | 0.80% |
Total income tax expense | $ 65,527 | [2] | $ 51,740 | [3] | $ 37,735 | [4]
Effective income tax and rate, percentage | 19.15% | [2] | 18.61% | [3] | 15.43% | [4]
[1] | (2) State taxes in Alabama, Florida, and South Carolina make up the majority (greater than 50%) of the tax effect in this category
[2] | (1) Post-adoption of ASU 2023-09
[3] | (3) 2024 and 2023 are pre-adoption of ASU 2023-09
[4] | (3) 2024 and 2023 are pre-adoption of ASU 2023-09

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying statutory federal (national) tax rate to pretax income (loss) from continuing operation attributable to other reconciling item. Excludes state and local income tax expense (benefit), federal tax expense (benefit), statutory income tax expense (benefit) outside of country of domicile, tax credit, nondeductible expense, deduction, income tax settlement, income tax contingency, and cross-border tax law. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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