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Note 21 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) $ in Thousands | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Total risk-based capital, actual amount | [1] | $ 969,918 | $ 943,723
Total risk-based capital, actual ratio | [1] | 0.1285 | 0.1273
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 603,908 | $ 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] | $ 849,542 | $ 828,386
Common Equity Tier 1 risk-based capital, actual ratio | [1] | 0.1125 | 0.1117
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 339,698 | $ 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] | $ 875,542 | $ 854,386
Tier 1 risk-based capita, actual ratio | [1] | 0.116 | 0.1152
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 452,931 | $ 444,901
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.06 | 0.06
Leverage, actual amount |  | $ 875,542 | $ 854,386
Leverage, actual ratio |  | 0.0998 | 0.0994
Leverage, minimum for adequately capitalized amount |  | $ 351,080 | $ 343,886
Leverage, minimum for adequately capitalized ratio |  | 0.04 | 0.04
Subsidiaries [Member] |  |  |
Total risk-based capital, actual amount | [1] | $ 944,773 | $ 918,210
Total risk-based capital, actual ratio | [1] | 0.1252 | 0.1239
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 603,520 | $ 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] | $ 754,000 | $ 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] | $ 850,457 | $ 828,873
Common Equity Tier 1 risk-based capital, actual ratio | [1] | 0.1127 | 0.1118
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 339,480 | $ 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] | $ 490,360 | $ 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] | $ 850,457 | $ 828,873
Tier 1 risk-based capita, actual ratio | [1] | 0.1127 | 0.1118
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 452,640 | $ 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] | $ 603,520 | $ 593,002
Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.08 | 0.08
Leverage, actual amount |  | $ 850,457 | $ 828,873
Leverage, actual ratio |  | 0.097 | 0.0965
Leverage, minimum for adequately capitalized amount |  | $ 350,831 | $ 343,624
Leverage, minimum for adequately capitalized ratio |  | 0.04 | 0.04
Leverage, minimum for well capitalized amount |  | $ 438,539 | $ 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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