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Note 19 - Regulatory Matters - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) $ in Thousands | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual |  | $ 460,031 | $ 449,497
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual |  | 0.1036 | 0.1018
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum |  | $ 199,821 | $ 198,743
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum |  | 0.045 | 0.045
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum | [1] | $ 288,631 | $ 287,074
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum | [1] | 0.065 | 0.065
Banking Regulation, Tier 1 Risk-Based Capital, Actual |  | $ 460,031 | $ 449,497
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual |  | 0.1036 | 0.1018
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum |  | $ 266,428 | $ 264,991
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum |  | 0.06 | 0.06
Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum | [1] | $ 355,238 | $ 353,322
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum | [1] | 0.08 | 0.08
Banking Regulation, Total Capital, Actual |  | $ 515,692 | $ 504,857
Banking Regulation, Total Risk-Based Capital Ratio, Actual |  | 0.1161 | 0.1143
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum |  | $ 355,238 | $ 353,322
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum |  | 0.08 | 0.08
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum | [1] | $ 444,047 | $ 441,652
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum | [1] | 0.10 | 0.10
Banking Regulation, Tier 1 Leverage Capital, Actual |  | $ 460,031 | $ 449,497
Banking Regulation, Tier 1 Leverage Capital Ratio, Actual |  | 0.0906 | 0.0869
Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum |  | $ 203,150 | $ 206,832
Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum |  | 0.04 | 0.04
Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum | [1] | $ 253,937 | $ 258,540
Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum | [1] | 0.05 | 0.05
Subsidiaries [Member] |  |  |
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual | [1] | $ 455,119 | $ 443,833
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual | [1] | 0.101 | 0.0991
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum | [1] | $ 202,684 | $ 201,441
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum | [1] | 0.045 | 0.045
Banking Regulation, Tier 1 Risk-Based Capital, Actual | [1] | $ 464,216 | $ 452,903
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual | [1] | 0.1031 | 0.1012
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum | [1] | $ 270,246 | $ 268,588
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum | [1] | 0.06 | 0.06
Banking Regulation, Total Capital, Actual | [1] | $ 570,663 | $ 559,002
Banking Regulation, Total Risk-Based Capital Ratio, Actual | [1] | 0.1267 | 0.1249
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum | [1] | $ 360,328 | $ 358,118
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum | [1] | 0.08 | 0.08
Banking Regulation, Tier 1 Leverage Capital, Actual | [1] | $ 464,216 | $ 452,903
Banking Regulation, Tier 1 Leverage Capital Ratio, Actual | [1] | 0.0886 | 0.0865
Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum | [1] | $ 209,690 | $ 209,532
Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum | [1] | 0.04 | 0.04
[1] | “Minimum to be Well Capitalized Under Prompt Corrective Action” is not formally defined under applicable banking regulations for bank holding companies.

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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/1943274/2147477270/942-505-50-1 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/1943274/2147477270/942-505-50-1B + Details
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