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Note 15 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2025
Notes Tables |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year Ended December 31, |
|  | 2025 |  |  | 2024 |  |  | 2023 |
|  | (In Thousands) |
Current tax expense: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 58,121 |  |  | $ | 51,897 |  |  | $ | 35,124 |
State |  |  | 5,578 |  |  |  | 3,194 |  |  |  | 3,616 |
Total current tax expense |  |  | 63,699 |  |  |  | 55,091 |  |  |  | 38,740 |
Deferred tax (benefit) expense: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 1,082 |  |  |  | (2,227 | ) |  |  | (1,057 | )
State |  |  | 746 |  |  |  | (1,124 | ) |  |  | 52 |
Total deferred tax (benefit) |  |  | 1,828 |  |  |  | (3,351 | ) |  |  | (1,005 | )
Total income tax expense |  | $ | 65,527 |  |  | $ | 51,740 |  |  | $ | 37,735 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended December 31, 2025 |
|  | Amount |  |  | % of Pre-tax Earnings |
|  | (In Thousands) |
US federal statutory income tax |  |  | 71,848 |  |  |  | 21.00 | %
State and local income taxes, net of federal income tax effect(2) |  |  | 5,023 |  |  |  | 1.47 | %
Tax credits: |  |  |  |  |  |  |  |
Energy tax credits |  |  | (4,500 | ) |  |  | (1.32 | )%
Other credits |  |  | (4,592 | ) |  |  | (1.34 | )%
Nontaxable or nondeductible items |  |  | (2,863 | ) |  |  | (0.84 | )%
Change in unrecognized tax positions |  |  | 176 |  |  |  | 0.05 | %
Other |  |  | 435 |  |  |  | 0.13 | %
Effective income tax and rate(1) |  | $ | 65,527 |  |  |  | 19.15 | %
|  | Year Ended December 31, 2024 |
|  | Amount |  |  | % of Pre-tax Earnings |
|  | (In Thousands) |
Income tax at statutory federal rate |  | $ | 58,585 |  |  |  | 21.00 | %
Effect on rate of: |  |  |  |  |  |  |  |
State income tax, net of federal tax effect |  |  | 1,787 |  |  |  | 0.64 | %
Tax-exempt income, net of expenses |  |  | (14 | ) |  |  | (0.01 | )%
Bank-owned life insurance contracts |  |  | (2,002 | ) |  |  | (0.72 | )%
Excess tax benefit from stock compensation |  |  | (1,117 | ) |  |  | (0.40 | )%
Federal tax credits, net of related amortization |  |  | (6,297 | ) |  |  | (2.26 | )%
Other |  |  | 798 |  |  |  | 0.36 | %
Effective income tax and rate(3) |  | $ | 51,740 |  |  |  | 18.61 | %
|  | Year Ended December 31, 2023 |
|  | Amount |  |  | % of Pre-tax Earnings |
|  | (In Thousands) |
Income tax at statutory federal rate |  | $ | 51,363 |  |  |  | 21.00 | %
Effect on rate of: |  |  |  |  |  |  |  |
State income tax, net of federal tax effect |  |  | 3,339 |  |  |  | 1.37 | %
Tax-exempt income, net of expenses |  |  | (92 | ) |  |  | (0.04 | )%
Bank-owned life insurance contracts |  |  | (1,591 | ) |  |  | (0.65 | )%
Excess tax benefit from stock compensation |  |  | (1,242 | ) |  |  | (0.51 | )%
Federal tax credits, net of related amortization |  |  | (16,002 | ) |  |  | (6.54 | )%
Other |  |  | 1,960 |  |  |  | 0.80 | %
Effective income tax and rate(3) |  | $ | 37,735 |  |  |  | 15.43 | %
(3) 2024 and 2023 are pre-adoption of ASU 2023-09 |  |  |  |  |  |  |  |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |
|  | 2025 |  |  | 2024 |
|  | (In Thousands) |
Deferred tax assets: |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 43,236 |  |  | $ | 41,431 |
Other real estate owned |  |  | - |  |  |  | 255 |
Nonqualified equity awards |  |  | 1,472 |  |  |  | 1,375 |
Nonaccrual interest |  |  | 216 |  |  |  | 814 |
State tax credits carryforward |  |  | 1,530 |  |  |  | 2,195 |
Deferred loan fees |  |  | 4,523 |  |  |  | 4,074 |
Reserve for unfunded commitments |  |  | - |  |  |  | - |
Accrued bonus |  |  | 3,685 |  |  |  | 3,910 |
Capital loss carryforward |  |  | 662 |  |  |  | 1,716 |
Lease liability |  |  | 5,788 |  |  |  | 6,790 |
Deferred revenue |  |  | - |  |  |  | - |
Net unrealized loss on securities available for sale |  |  | 722 |  |  |  | 10,937 |
Other deferred tax assets |  |  | 780 |  |  |  | 1,996 |
Total deferred tax assets |  |  | 62,614 |  |  |  | 75,493 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Depreciation |  |  | 3,671 |  |  |  | 4,138 |
Prepaid expenses |  |  | 921 |  |  |  | 781 |
Investments |  |  | 1,178 |  |  |  | 950 |
Right-of-use assets and other leasing transactions |  |  | 5,527 |  |  |  | 6,541 |
Other deferred tax liabilities |  |  | 1,612 |  |  |  | 1,335 |
Total deferred tax liabilities |  |  | 12,909 |  |  |  | 13,745 |
Net deferred tax assets |  | $ | 49,705 |  |  | $ | 61,748 |
Income Taxes Paid, Net [Table Text Block] |
The Federal and State total of income taxes paid (net of refunds received): |
|  | 2025 |
Federal |  | $ | 27,521,000 |
State(4) |  |  | 7,056,359 |
Total |  |  | 34,577,359 |
5% threshold (4) |  |  | 1,728,868 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] |
|  | 2025 |  |  | 2024 |  |  | 2023 |
|  | (In Thousands) |
Balance, beginning of year |  | $ | 1,913 |  |  | $ | 2,092 |  |  | $ | - |
Increases related to prior year tax positions |  |  | - |  |  |  | - |  |  |  | 1,285 |
Decreases related to prior year tax positions |  |  | (1,401 | ) |  |  | (854 | ) |  |  | - |
Increases related to current year tax positions |  |  | 137 |  |  |  | 675 |  |  |  | 807 |
Balance, end of year |  | $ | 649 |  |  | $ | 1,913 |  |  | $ | 2,092 |

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