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Note 26 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Total risk-based capital, actual amount | [1] | $ 849,836 |  | $ 762,956
Total risk-based capital, actual ratio | [1] | 0.1256 |  | 0.1254
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 541,370 |  | $ 486,841
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.08 |  | 0.08
Common Equity Tier 1 risk-based capital, actual amount |  | $ 747,376 | [1] | $ 672,045
Common Equity Tier 1 risk-based capital, actual ratio |  | 0.1104 | [1] | 0.1104
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 304,521 | [1] | $ 273,848
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio |  | 0.045 | [1] | 0.045
Tier 1 risk-based capital, actual amount | [1] | $ 773,376 |  | $ 698,045
Tier 1 risk-based capita, actual ratio | [1] | 0.1143 |  | 0.1147
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 406,027 |  | $ 365,131
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.06 |  | 0.06
Tier 1 risk-based capital, actual amount | [1] | $ 773,376 |  | $ 698,045
Leverage, actual ratio |  | 0.0962 |  | 0.0933
Leverage, minimum for adequately capitalized amount |  | $ 321,713 |  | $ 299,329
Leverage, minimum for adequately capitalized ratio |  | 0.04 | [1] | 0.04
Leverage, actual amount |  |  |  | $ 698,045
Subsidiaries [Member] |  |  |  |
Total risk-based capital, actual amount | [1] | $ 823,275 |  | $ 732,688
Total risk-based capital, actual ratio | [1] | 0.1221 |  | 0.1208
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 539,609 |  | $ 485,314
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.08 |  | 0.08
Total risk-based capital, minimum for well capitalized amount | [1] | $ 674,511 |  | $ 606,643
Total risk-based capital, minimum for well capitalized ratio | [1] | 0.10 |  | 0.10
Common Equity Tier 1 risk-based capital, actual amount |  | $ 746,815 | [1] | $ 667,777
Common Equity Tier 1 risk-based capital, actual ratio |  | 0.1107 | [1] | 0.1101
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 303,530 | [1] | $ 272,989
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio |  | 0.045 | [1] | 0.045
Common Equity Tier 1 risk-based capital, minimum for well capitalized amount |  | $ 438,432 | [1] | $ 394,318
Common Equity Tier 1 risk-based capital, minimum for well capitalized ratio |  | 0.065 | [1] | 0.065
Tier 1 risk-based capital, actual amount | [1] | $ 746,815 |  | $ 667,777
Tier 1 risk-based capita, actual ratio | [1] | 0.1107 |  | 0.1101
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 404,707 |  | $ 363,986
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] | $ 539,609 |  | $ 485,314
Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.08 |  | 0.08
Tier 1 risk-based capital, actual amount | [1] | $ 746,815 |  | $ 667,777
Leverage, actual ratio |  | 0.093 |  | 0.0895
Leverage, minimum for adequately capitalized amount |  | $ 321,323 |  | $ 298,600
Leverage, minimum for adequately capitalized ratio |  | 0.04 |  | 0.04
Leverage, actual amount |  | $ 746,815 |  | $ 667,777
Leverage, minimum for well capitalized amount |  | $ 401,654 |  | $ 373,250
Leverage, minimum for well capitalized ratio |  | 0.05 |  | 0.05
[1] | Ratio is computed in relation to risk-weighted assets.

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- Definition Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets required for capital adequacy 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B + Details
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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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