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Note 21 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) $ in Thousands | Mar. 31, 2026 USD ($) | Dec. 31, 2025 USD ($)
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Total risk-based capital, actual amount | [1] | $ 1,087,675 | $ 1,057,932
Total risk-based capital, actual ratio | [1] | 0.1353 | 0.1342
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 643,312 | $ 630,800
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.08 | 0.08
Common Equity Tier 1 risk-based capital, actual amount | [1] | $ 961,145 | $ 933,354
Common Equity Tier 1 risk-based capital, actual ratio | [1] | 0.1195 | 0.1184
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 361,863 | $ 354,825
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.045 | 0.045
Tier 1 risk-based capital, actual amount | [1] | $ 987,145 | $ 959,354
Tier 1 risk-based capita, actual ratio | [1] | 0.1228 | 0.1217
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 482,484 | $ 473,100
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.06 | 0.06
Leverage, actual amount | [1] | $ 987,145 | $ 959,354
Leverage, actual ratio | [1] | 0.1068 | 0.103
Leverage, minimum for adequately capitalized amount | [1] | $ 369,736 | $ 372,695
Leverage, minimum for adequately capitalized ratio | [1] | 0.04 | 0.04
Subsidiaries [Member] |  |  |
Total risk-based capital, actual amount | [1] | $ 1,058,962 | $ 1,030,454
Total risk-based capital, actual ratio | [1] | 0.1318 | 0.1307
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 642,554 | $ 630,567
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.08 | 0.08
Total risk-based capital, minimum for well capitalized amount | [1] | $ 803,192 | $ 788,209
Total risk-based capital, minimum for well capitalized ratio | [1] | 0.10 | 0.10
Common Equity Tier 1 risk-based capital, actual amount | [1] | $ 958,549 | $ 931,912
Common Equity Tier 1 risk-based capital, actual ratio | [1] | 0.1193 | 0.1182
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 361,437 | $ 354,694
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.045 | 0.045
Common Equity Tier 1 risk-based capital, minimum for well capitalized amount | [1] | $ 522,075 | $ 512,336
Common Equity Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.065 | 0.065
Tier 1 risk-based capital, actual amount | [1] | $ 958,549 | $ 931,912
Tier 1 risk-based capita, actual ratio | [1] | 0.1193 | 0.1182
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 481,915 | $ 472,925
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.06 | 0.06
Tier 1 risk-based capital, minimum for well capitalized amount | [1] | $ 642,554 | $ 630,567
Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.08 | 0.08
Leverage, actual amount | [1] | $ 958,549 | $ 931,912
Leverage, actual ratio | [1] | 0.1038 | 0.1001
Leverage, minimum for adequately capitalized amount | [1] | $ 369,505 | $ 372,449
Leverage, minimum for adequately capitalized ratio | [1] | 0.04 | 0.04
Leverage, minimum for well capitalized amount | [1] | $ 461,882 | $ 465,561
Leverage, minimum for well capitalized ratio | [1] | 0.05 | 0.05
[1] | Ratio is computed in relation to risk-weighted assets.

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