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Note 22 - Regulatory Matters - Capital and Leverage Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Common Equity Tier 1 to Risk-Weighted Assets, Actual amount | $ 2,574,047 | $ 2,501,439
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio | 13.84% | 13.23%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required | $ 1,302,198 | $ 1,323,846
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 | $ 1,209,184 | $ 1,229,286
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 | $ 2,574,047 | $ 2,501,439
Tier 1 Capital to Risk-Weighted Assets, Actual ratio | 0.1384 | 0.1323
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,581,240 | $ 1,607,527
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 | $ 1,488,226 | $ 1,512,967
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 | $ 2,745,488 | $ 2,665,054
Total Capital to Risk-Weighted Assets, Actual ratio | 0.1476 | 0.1409
Total Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,953,297 | $ 1,985,769
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 | $ 1,860,283 | $ 1,891,209
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.10 | 0.10
Leverage Ratio, Actual amount | $ 2,574,047 | $ 2,501,439
Leverage Ratio, Actual ratio | 0.112 | 0.1087
Leverage Ratio, Minimum Capital Required | $ 919,148 | $ 920,670
Leverage Ratio Minimum Capital Required, Ratio | 0.04 | 0.04
Leverage Ratio, Required to be Considered Well Capitalized | $ 1,148,935 | $ 1,150,838
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 | $ 2,521,240 | $ 2,430,773
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio | 13.54% | 12.84%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required | $ 1,303,177 | $ 1,325,277
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 | $ 1,210,093 | $ 1,230,615
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 | $ 2,521,240 | $ 2,430,773
Tier 1 Capital to Risk-Weighted Assets, Actual ratio | 0.1354 | 0.1284
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,582,429 | $ 1,609,265
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 | $ 1,489,345 | $ 1,514,602
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 | $ 2,808,181 | $ 2,709,888
Total Capital to Risk-Weighted Assets, Actual ratio | 0.1508 | 0.1431
Total Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,954,765 | $ 1,987,916
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 | $ 1,861,681 | $ 1,893,253
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.10 | 0.10
Leverage Ratio, Actual amount | $ 2,521,240 | $ 2,430,773
Leverage Ratio, Actual ratio | 0.1096 | 0.1055
Leverage Ratio, Minimum Capital Required | $ 920,018 | $ 921,473
Leverage Ratio Minimum Capital Required, Ratio | 0.04 | 0.04
Leverage Ratio, Required to be Considered Well Capitalized | $ 1,150,023 | $ 1,151,841
Leverage Ratio Required to be Considered Well Capitalized, Ratio | 0.05 | 0.05

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