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Note 21 - Regulatory Matters - Capital and Leverage Ratios (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Common Equity Tier 1 to Risk-Weighted Assets, Actual amount | $ 2,137,925,000 | $ 2,059,056,000
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio | 13.32% | 13.83%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required | $ 1,123,721,000 | $ 1,041,911,000
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 | $ 1,043,455,000 | $ 967,489,000
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 | $ 2,137,925,000 | $ 2,059,056,000
Tier 1 Capital to Risk-Weighted Assets, Actual ratio | 0.1332 | 0.1383
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,364,519,000 | $ 1,265,178,000
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 | $ 1,284,253,000 | $ 1,190,755,000
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 | $ 2,281,182,000 | $ 2,231,474,000
Total Capital to Risk-Weighted Assets, Actual ratio | 0.1421 | 0.1499
Total Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,685,582,000 | $ 1,562,866,000
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 | $ 1,605,316,000 | $ 1,488,444,000
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.10 | 0.1000
Leverage Ratio, Actual amount | $ 2,137,925,000 | $ 2,059,056,000
Leverage Ratio, Actual ratio | 0.1082 | 0.1119
Leverage Ratio, Minimum Capital Required | $ 790,430,000 | $ 736,317,000
Leverage Ratio Minimum Capital Required, Ratio | 0.0400 | 0.0400
Leverage Ratio, Required to be Considered Well Capitalized | $ 988,037,000 | $ 920,396,000
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 | $ 2,056,601,000 | $ 2,016,448,000
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio | 12.80% | 13.53%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required | $ 1,124,381 | $ 1,042,967
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 | $ 1,044,068,000 | $ 968,470,000
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 | $ 2,056,601,000 | $ 2,016,448,000
Tier 1 Capital to Risk-Weighted Assets, Actual ratio | 0.1280 | 0.1353
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,365,320,000 | $ 1,266,460,000
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 | $ 1,285,007,000 | $ 1,191,963,000
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 | $ 2,315,358,000 | $ 2,304,366,000
Total Capital to Risk-Weighted Assets, Actual ratio | 0.1441 | 0.1547
Total Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,686,572,000 | $ 1,564,451,000
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 | $ 1,606,259,000 | $ 1,489,953,000
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.1000 | 0.1000
Leverage Ratio, Actual amount | $ 2,056,601,000 | $ 2,016,448,000
Leverage Ratio, Actual ratio | 0.1040 | 0.1094
Leverage Ratio, Minimum Capital Required | $ 791,226,000 | $ 737,382,000
Leverage Ratio Minimum Capital Required, Ratio | 0.0400 | 0.0400
Leverage Ratio, Required to be Considered Well Capitalized | $ 989,033,000 | $ 921,727,000
Leverage Ratio Required to be Considered Well Capitalized, Ratio | 0.0500 | 0.0500

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