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Note 21 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) $ in Thousands | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Total risk-based capital, actual amount | [1] | $ 831,296 |  | $ 762,956
Total risk-based capital, actual ratio | [1] | 0.1271 |  | 0.1254
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 523,065 |  | $ 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 |  | $ 730,410 | [1] | $ 672,045
Common Equity Tier 1 risk-based capital, actual ratio |  | 0.1117 | [1] | 0.1104
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 294,224 | [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] | $ 756,410 |  | $ 698,045
Tier 1 risk-based capita, actual ratio | [1] | 0.1157 |  | 0.1147
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 392,298 |  | $ 365,131
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.06 |  | 0.06
Leverage, actual ratio |  | 0.098 |  | 0.0933
Leverage, minimum for adequately capitalized amount |  | $ 308,622 |  | $ 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] | $ 805,791 |  | $ 732,688
Total risk-based capital, actual ratio | [1] | 0.1237 |  | 0.1208
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 521,313 |  | $ 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] | $ 651,641 |  | $ 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 |  | $ 730,905 | [1] | $ 667,777
Common Equity Tier 1 risk-based capital, actual ratio |  | 0.1122 | [1] | 0.1101
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 293,239 | [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 |  | $ 423,567 | [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] | $ 730,905 |  | $ 667,777
Tier 1 risk-based capita, actual ratio | [1] | 0.1122 |  | 0.1101
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 390,985 |  | $ 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] | $ 521,313 |  | $ 485,314
Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.08 |  | 0.08
Leverage, actual ratio |  | 0.0949 |  | 0.0895
Leverage, minimum for adequately capitalized amount |  | $ 308,176 |  | $ 298,600
Leverage, minimum for adequately capitalized ratio |  | 0.04 |  | 0.04
Leverage, actual amount |  | $ 730,905 |  | $ 667,777
Leverage, minimum for well capitalized amount |  | $ 385,221 |  | $ 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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