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Note 21 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Total risk-based capital, actual amount | [1] | $ 1,028,017 | $ 943,723
Total risk-based capital, actual ratio | [1] | 0.1317 | 0.1273
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 624,415 | $ 593,201
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.08 | 0.08
Common Equity Tier 1 risk-based capital, actual amount | [1] | $ 904,431 | $ 828,386
Common Equity Tier 1 risk-based capital, actual ratio | [1] | 0.1159 | 0.1117
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 351,234 | $ 333,676
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] | $ 930,431 | $ 854,386
Tier 1 risk-based capita, actual ratio | [1] | 0.1192 | 0.1152
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 468,311 | $ 444,901
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.06 | 0.06
Leverage, actual amount |  | $ 930,431 | $ 854,386
Leverage, actual ratio |  | 0.1024 | 0.0994
Leverage, minimum for adequately capitalized amount |  | $ 363,491 | $ 343,886
Leverage, minimum for adequately capitalized ratio |  | 0.04 | 0.04
Subsidiaries [Member] |  |  |
Total risk-based capital, actual amount | [1] | $ 1,001,121 | $ 918,210
Total risk-based capital, actual ratio | [1] | 0.1283 | 0.1239
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 624,072 | $ 593,002
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.08 | 0.08
Total risk-based capital, minimum for well capitalized amount | [1] | $ 780,090 | $ 741,252
Total risk-based capital, minimum for well capitalized ratio | [1] | 0.10 | 0.10
Common Equity Tier 1 risk-based capital, actual amount | [1] | $ 903,588 | $ 828,873
Common Equity Tier 1 risk-based capital, actual ratio | [1] | 0.1158 | 0.1118
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 351,040 | $ 333,564
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] | $ 507,058 | $ 481,814
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] | $ 903,588 | $ 828,873
Tier 1 risk-based capita, actual ratio | [1] | 0.1158 | 0.1118
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 468,054 | $ 444,751
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] | $ 624,072 | $ 593,002
Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.08 | 0.08
Leverage, actual amount |  | $ 903,588 | $ 828,873
Leverage, actual ratio |  | 0.0995 | 0.0965
Leverage, minimum for adequately capitalized amount |  | $ 363,226 | $ 343,624
Leverage, minimum for adequately capitalized ratio |  | 0.04 | 0.04
Leverage, minimum for well capitalized amount |  | $ 454,032 | $ 429,530
Leverage, minimum for well capitalized ratio |  | 0.05 | 0.05
[1] | Ratio is computed in relation to risk-weighted assets.

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