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Note 21 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Total risk-based capital, actual amount |  | $ 918,369 |  | $ 849,836
Total risk-based capital, actual ratio | [1] | 0.1273 |  | 0.1256
Total risk-based capital, minimum for adequately capitalized amount |  | $ 577,245 |  | $ 541,370
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.08 |  | 0.08
Common Equity Tier 1 risk-based capital, actual amount |  | $ 805,082 |  | $ 747,376
Common Equity Tier 1 risk-based capital, actual ratio | [1] | 0.1116 |  | 0.1104
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 324,701 |  | $ 304,521
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.045 |  | 0.045
Tier 1 risk-based capital, actual amount |  | $ 831,082 |  | $ 773,376
Tier 1 risk-based capita, actual ratio | [1] | 0.1152 |  | 0.1143
Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 432,934 |  | $ 406,027
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.06 |  | 0.06
Leverage, actual amount |  | $ 831,082 |  | $ 773,376
Leverage, actual ratio |  | 0.1005 |  | 0.0962
Leverage, minimum for adequately capitalized amount |  | $ 330,781 |  | $ 321,713
Leverage, minimum for adequately capitalized ratio |  | 0.04 |  | 0.04
Subsidiaries [Member] |  |  |  |
Total risk-based capital, actual amount |  | $ 895,891 |  | $ 823,275
Total risk-based capital, actual ratio | [1] | 0.1246 |  | 0.1221
Total risk-based capital, minimum for adequately capitalized amount |  | $ 575,399 |  | $ 539,609
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.08 |  | 0.08
Total risk-based capital, minimum for well capitalized amount |  | $ 719,249 |  | $ 674,511
Total risk-based capital, minimum for well capitalized ratio | [1] | 0.10 |  | 0.10
Common Equity Tier 1 risk-based capital, actual amount |  | $ 808,604 |  | $ 746,815
Common Equity Tier 1 risk-based capital, actual ratio | [1] | 0.1124 |  | 0.1107
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 323,662 |  | $ 303,530
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 |  | $ 467,512 | [1] | $ 438,432
Common Equity Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.065 |  | 0.065
Tier 1 risk-based capital, actual amount |  | $ 808,604 |  | $ 746,815
Tier 1 risk-based capita, actual ratio | [1] | 0.1124 |  | 0.1107
Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 431,550 |  | $ 404,707
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 |  | $ 575,399 | [1] | $ 539,609
Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.08 |  | 0.08
Leverage, actual amount |  | $ 808,604 |  | $ 746,815
Leverage, actual ratio |  | 0.0979 |  | 0.093
Leverage, minimum for adequately capitalized amount |  | $ 330,547 |  | $ 321,323
Leverage, minimum for adequately capitalized ratio |  | 0.04 |  | 0.04
Leverage, minimum for well capitalized amount |  | $ 413,184 |  | $ 401,654
Leverage, minimum for well capitalized ratio |  | 0.05 |  | 0.05
[1] | (1) Ratio is computed in relation to risk-weighted assets.

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