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Note 26 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Total risk-based capital, actual amount | [1] | $ 762,956 |  | $ 596,411
Total risk-based capital, actual ratio | [1] | 0.1254 |  | 0.1279
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 486,841 |  | $ 372,929
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0800 |  | 0.0800
Common Equity Tier 1 risk-based capital, actual amount |  | $ 672,045 | [1] | $ 556,590
Common Equity Tier 1 risk-based capital, actual ratio |  | 0.1147 | [1] | 0.1194
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 273,848 | [1] | $ 209,772
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] | $ 698,045 |  | $ 556,590
Tier 1 risk-based capita, actual ratio | [1] | 0.1104 |  | 0.1194
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 365,131 |  | $ 279,696
Tier 1 risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0600 |  | 0.0600
Tier 1 risk-based capital, actual amount | [1] | $ 698,045 |  | $ 556,590
Leverage, actual ratio |  | 0.0933 |  | 0.0886
Leverage, minimum for adequately capitalized amount |  | $ 299,329 |  | $ 251,348
Leverage, minimum for adequately capitalized ratio |  | 0.0400 | [1] | 0.0400
Leverage, actual amount |  |  |  | $ 556,590
Subsidiaries [Member] |  |  |  |
Total risk-based capital, actual amount | [1] | $ 732,688 |  | $ 577,078
Total risk-based capital, actual ratio | [1] | 0.1208 |  | 0.1242
Total risk-based capital, minimum for adequately capitalized amount | [1] | $ 485,314 |  | $ 371,809
Total risk-based capital, minimum for adequately capitalized ratio | [1] | 0.0800 |  | 0.0800
Total risk-based capital, minimum for well capitalized amount | [1] | $ 606,643 |  | $ 464,761
Total risk-based capital, minimum for well capitalized ratio | [1] | 0.100 |  | 0.1000
Common Equity Tier 1 risk-based capital, actual amount |  | $ 667,777 | [1] | $ 537,257
Common Equity Tier 1 risk-based capital, actual ratio |  | 0.1101 | [1] | 0.1156
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount |  | $ 272,989 | [1] | $ 209,142
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 |  | $ 394,318 | [1] | $ 302,095
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] | $ 667,777 |  | $ 537,257
Tier 1 risk-based capita, actual ratio | [1] | 0.1101 |  | 0.1156
Tier 1 risk-based capital, minimum for adequately capitalized amount | [1] | $ 363,986 |  | $ 278,857
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] | $ 485,314 |  | $ 371,809
Tier 1 risk-based capital, minimum for well capitalized ratio | [1] | 0.080 |  | 0.0800
Tier 1 risk-based capital, actual amount | [1] | $ 667,777 |  | $ 537,257
Leverage, actual ratio |  | 0.0895 |  | 0.0857
Leverage, minimum for adequately capitalized amount |  | $ 298,600 |  | $ 250,871
Leverage, minimum for adequately capitalized ratio |  | 0.0400 |  | 0.0400
Leverage, actual amount |  | $ 667,777 |  | $ 537,257
Leverage, minimum for well capitalized amount |  | $ 373,250 |  | $ 313,588
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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Amount of Tier 1 leverage capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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