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Note 21 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) $ in Thousands | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Total risk-based capital, actual amount | [1] | $ 810,283 |  | $ 762,956
Total risk-based capital, actual ratio | [1] | 0.1278 |  | 0.1254
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 507,231 |  | $ 486,841
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0800 |  | 0.0800
Common Equity Tier 1 risk-based capital, actual amount |  | $ 710,237 | [1] | $ 672,045
Common Equity Tier 1 risk-based capital, actual ratio |  | 0.1120 | [1] | 0.1104
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 285,318 | [1] | $ 273,848
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio |  | 0.0450 | [1] | 0.0450
Tier 1 risk-based capital, actual amount | [1] | $ 736,237 |  | $ 698,045
Tier 1 risk-based capita, actual ratio | [1] | 0.1161 |  | 0.1147
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 380,424 |  | $ 365,131
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0600 |  | 0.0600
Leverage, actual ratio |  | 0.0983 |  | 0.0933
Leverage, minimum for adequately capitalized amount |  | $ 299,726 |  | $ 299,329
Leverage, minimum for adequately capitalized ratio |  | 0.0400 | [1] | 0.0400
Leverage, actual amount |  |  |  | $ 698,045
Subsidiaries [Member] |  |  |  |
Total risk-based capital, actual amount | [1] | $ 785,543 |  | $ 732,688
Total risk-based capital, actual ratio | [1] | 0.1243 |  | 0.1208
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 505,231 |  | $ 485,314
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0800 |  | 0.0800
Total risk-based capital, minimum for well capitalized amount | [1] | $ 631,914 |  | $ 606,643
Total risk-based capital, minimum for well capitalized ratio | [1] | 0.100 |  | 0.1000
Common Equity Tier 1 risk-based capital, actual amount |  | $ 711,497 | [1] | $ 667,777
Common Equity Tier 1 risk-based capital, actual ratio |  | 0.1126 | [1] | 0.1101
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 284,361 | [1] | $ 272,989
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio |  | 0.0450 | [1] | 0.0450
Common Equity Tier 1 risk-based capital, minimum for well capitalized amount |  | $ 410,744 | [1] | $ 394,318
Common Equity Tier 1 risk-based capital, minimum for well capitalized ratio |  | 0.065 | [1] | 0.0650
Tier 1 risk-based capital, actual amount | [1] | $ 711,497 |  | $ 667,777
Tier 1 risk-based capita, actual ratio | [1] | 0.1126 |  | 0.1101
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 379,148 |  | $ 363,986
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0600 |  | 0.0600
Tier 1 risk-based capital, minimum for well capitalized amount | [1] | $ 505,531 |  | $ 485,314
Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.080 |  | 0.0800
Leverage, actual ratio |  | 0.0951 |  | 0.0895
Leverage, minimum for adequately capitalized amount |  | $ 299,269 |  | $ 298,600
Leverage, minimum for adequately capitalized ratio |  | 0.0400 |  | 0.0400
Leverage, actual amount |  | $ 711,497 |  | $ 667,777
Leverage, minimum for well capitalized amount |  | $ 374,087 |  | $ 373,250
Leverage, minimum for well capitalized ratio |  | 0.050 |  | 0.0500
[1] | Ratio is computed in relation to risk-weighted assets.

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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 + Details
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