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Note 21 - Regulatory Matters - Risk Based Capital Amounts and Ratios (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Total risk-based capital, actual amount [1] $ 1,028,017 $ 943,723
Total risk-based capital, actual ratio [1] 0.1317 0.1273
Total risk-based capital, minimum for adequately capitalized amount [1] $ 624,415 $ 593,201
Total risk-based capital, minimum for adequately capitalized ratio [1] 0.08 0.08
Common Equity Tier 1 risk-based capital, actual amount [1] $ 904,431 $ 828,386
Common Equity Tier 1 risk-based capital, actual ratio [1] 0.1159 0.1117
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount [1] $ 351,234 $ 333,676
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio [1] 0.045 0.045
Tier 1 risk-based capital, actual amount [1] $ 930,431 $ 854,386
Tier 1 risk-based capita, actual ratio [1] 0.1192 0.1152
Tier 1 risk-based capital, minimum for adequately capitalized amount [1] $ 468,311 $ 444,901
Tier 1 risk-based capital, minimum for adequately capitalized ratio [1] 0.06 0.06
Leverage, actual amount $ 930,431 $ 854,386
Leverage, actual ratio 0.1024 0.0994
Leverage, minimum for adequately capitalized amount $ 363,491 $ 343,886
Leverage, minimum for adequately capitalized ratio 0.04 0.04
Subsidiaries [Member]    
Total risk-based capital, actual amount [1] $ 1,001,121 $ 918,210
Total risk-based capital, actual ratio [1] 0.1283 0.1239
Total risk-based capital, minimum for adequately capitalized amount [1] $ 624,072 $ 593,002
Total risk-based capital, minimum for adequately capitalized ratio [1] 0.08 0.08
Total risk-based capital, minimum for well capitalized amount [1] $ 780,090 $ 741,252
Total risk-based capital, minimum for well capitalized ratio [1] 0.10 0.10
Common Equity Tier 1 risk-based capital, actual amount [1] $ 903,588 $ 828,873
Common Equity Tier 1 risk-based capital, actual ratio [1] 0.1158 0.1118
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized amount [1] $ 351,040 $ 333,564
Common Equity Tier 1 risk-based capital, minimum for adequately capitalized ratio [1] 0.045 0.045
Common Equity Tier 1 risk-based capital, minimum for well capitalized amount [1] $ 507,058 $ 481,814
Common Equity Tier 1 risk-based capital, minimum for well capitalized ratio [1] 0.065 0.065
Tier 1 risk-based capital, actual amount [1] $ 903,588 $ 828,873
Tier 1 risk-based capita, actual ratio [1] 0.1158 0.1118
Tier 1 risk-based capital, minimum for adequately capitalized amount [1] $ 468,054 $ 444,751
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] $ 624,072 $ 593,002
Tier 1 risk-based capital, minimum for well capitalized ratio [1] 0.08 0.08
Leverage, actual amount $ 903,588 $ 828,873
Leverage, actual ratio 0.0995 0.0965
Leverage, minimum for adequately capitalized amount $ 363,226 $ 343,624
Leverage, minimum for adequately capitalized ratio 0.04 0.04
Leverage, minimum for well capitalized amount $ 454,032 $ 429,530
Leverage, minimum for well capitalized ratio 0.05 0.05
[1] Ratio is computed in relation to risk-weighted assets.