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Note 23 - Regulatory Matters - Capital and Leverage Ratios (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
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Common Equity Tier 1 to Risk-Weighted Assets, Actual amount | $ 2,276,830,000 | $ 2,137,925,000
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio | 12.75% | 13.32%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required | $ 1,250,461,000 | $ 1,123,721,000
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 | $ 1,161,142,000 | $ 1,043,455,000
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 | $ 2,276,830,000 | $ 2,137,925,000
Tier 1 Capital to Risk-Weighted Assets, Actual ratio | 0.1275 | 0.1332
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,518,417,000 | $ 1,364,519,000
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 | $ 1,429,098,000 | $ 1,284,253,000
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.08 | 0.0800
Total Capital to Risk-Weighted Assets, Actual amount | $ 2,432,045,000 | $ 2,281,182,000
Total Capital to Risk-Weighted Assets, Actual ratio | 0.1361 | 0.1421
Total Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,875,691,000 | $ 1,685,582,000
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 | $ 1,786,373,000 | $ 1,605,316,000
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.10 | 0.1000
Leverage Ratio, Actual amount | $ 2,276,830,000 | $ 2,137,925,000
Leverage Ratio, Actual ratio | 0.1053 | 0.1082
Leverage Ratio, Minimum Capital Required | $ 864,918,000 | $ 790,430,000
Leverage Ratio Minimum Capital Required, Ratio | 0.0400 | 0.0400
Leverage Ratio, Required to be Considered Well Capitalized | $ 1,081,148,000 | $ 988,037,000
Leverage Ratio Required to be Considered Well Capitalized, Ratio | 0.05 | 0.0500
Bank [Member] |  |
Common Equity Tier 1 to Risk-Weighted Assets, Actual amount | $ 2,182,066,000 | $ 2,056,601,000
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio | 12.21% | 12.80%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required | $ 1,250,914 | $ 1,124,381
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 | $ 1,161,563,000 | $ 1,044,068,000
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 | $ 2,182,066,000 | $ 2,056,601,000
Tier 1 Capital to Risk-Weighted Assets, Actual ratio | 0.1221 | 0.1280
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,518,967,000 | $ 1,365,320,000
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 | $ 1,429,616,000 | $ 1,285,007,000
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.0800 | 0.0800
Total Capital to Risk-Weighted Assets, Actual amount | $ 2,452,781,000 | $ 2,315,358,000
Total Capital to Risk-Weighted Assets, Actual ratio | 0.1373 | 0.1441
Total Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,876,371,000 | $ 1,686,572,000
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 | $ 1,787,020,000 | $ 1,606,259,000
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.1000 | 0.1000
Leverage Ratio, Actual amount | $ 2,182,066,000 | $ 2,056,601,000
Leverage Ratio, Actual ratio | 0.1008 | 0.1040
Leverage Ratio, Minimum Capital Required | $ 865,470,000 | $ 791,226,000
Leverage Ratio Minimum Capital Required, Ratio | 0.0400 | 0.0400
Leverage Ratio, Required to be Considered Well Capitalized | $ 1,081,838,000 | $ 989,033,000
Leverage Ratio Required to be Considered Well Capitalized, Ratio | 0.0500 | 0.0500

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