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Note 23 - Regulatory Matters - Capital and Leverage Ratios (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Common Equity Tier 1 to Risk-Weighted Assets, Actual amount | $ 2,501,439,000 | $ 2,276,830,000
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio | 13.23% | 12.75%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required | $ 1,323,846,000 | $ 1,250,461,000
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required, Ratio | 7.00% | 7.00%
Common Equity Tier 1 to Risk-Weighted Assets, Required to be Considered Well Capitalized | $ 1,229,286,000 | $ 1,161,142,000
Common Equity Tier 1 to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 6.50% | 6.50%
Tier 1 Capital to Risk-Weighted Assets, Actual amount | $ 2,501,439,000 | $ 2,276,830,000
Tier 1 Capital to Risk-Weighted Assets, Actual ratio | 0.1323 | 0.1275
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,607,527,000 | $ 1,518,417,000
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio | 8.50% | 8.50%
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized | $ 1,512,967,000 | $ 1,429,098,000
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.08 | 0.08
Total Capital to Risk-Weighted Assets, Actual amount | $ 2,665,054,000 | $ 2,432,045,000
Total Capital to Risk-Weighted Assets, Actual ratio | 0.1409 | 0.1361
Total Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,985,769,000 | $ 1,875,691,000
Total Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio | 10.50% | 10.50%
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized | $ 1,891,209,000 | $ 1,786,373,000
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.10 | 0.10
Leverage Ratio, Actual amount | $ 2,501,439,000 | $ 2,276,830,000
Leverage Ratio, Actual ratio | 0.1087 | 0.1053
Leverage Ratio, Minimum Capital Required | $ 920,670,000 | $ 864,918,000
Leverage Ratio Minimum Capital Required, Ratio | 0.04 | 0.04
Leverage Ratio, Required to be Considered Well Capitalized | $ 1,150,838,000 | $ 1,081,148,000
Leverage Ratio Required to be Considered Well Capitalized, Ratio | 0.05 | 0.05
Bank [Member] |  |
Common Equity Tier 1 to Risk-Weighted Assets, Actual amount | $ 2,430,773,000 | $ 2,182,066,000
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio | 12.84% | 12.21%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required | $ 1,325,277 | $ 1,250,914
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required, Ratio | 7.00% | 7.00%
Common Equity Tier 1 to Risk-Weighted Assets, Required to be Considered Well Capitalized | $ 1,230,615,000 | $ 1,161,563,000
Common Equity Tier 1 to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 6.50% | 6.50%
Tier 1 Capital to Risk-Weighted Assets, Actual amount | $ 2,430,773,000 | $ 2,182,066,000
Tier 1 Capital to Risk-Weighted Assets, Actual ratio | 0.1284 | 0.1221
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,609,265,000 | $ 1,518,967,000
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio | 8.50% | 8.50%
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized | $ 1,514,602,000 | $ 1,429,616,000
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.08 | 0.08
Total Capital to Risk-Weighted Assets, Actual amount | $ 2,709,888,000 | $ 2,452,781,000
Total Capital to Risk-Weighted Assets, Actual ratio | 0.1431 | 0.1373
Total Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,987,916,000 | $ 1,876,371,000
Total Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio | 10.50% | 10.50%
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized | $ 1,893,253,000 | $ 1,787,020,000
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.10 | 0.10
Leverage Ratio, Actual amount | $ 2,430,773,000 | $ 2,182,066,000
Leverage Ratio, Actual ratio | 0.1055 | 0.1008
Leverage Ratio, Minimum Capital Required | $ 921,473,000 | $ 865,470,000
Leverage Ratio Minimum Capital Required, Ratio | 0.04 | 0.04
Leverage Ratio, Required to be Considered Well Capitalized | $ 1,151,841,000 | $ 1,081,838,000
Leverage Ratio Required to be Considered Well Capitalized, Ratio | 0.05 | 0.05

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