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Note 21 - Regulatory Matters - Capital and Leverage Ratios (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Common Equity Tier 1 to Risk-Weighted Assets, Actual amount | $ 2,059,056 | $ 1,959,832
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio | 13.83% | 12.97%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required | $ 1,041,911 | $ 1,057,880
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 | $ 967,489 | $ 982,318
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 | $ 2,059,056 | $ 1,959,832
Tier 1 Capital to Risk-Weighted Assets, Actual ratio | 0.1383 | 0.1297
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,265,178 | $ 1,284,569
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio | 0.0850 | 0.0850
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized | $ 1,190,755 | $ 1,209,006
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 | $ 2,231,474 | $ 2,086,911
Total Capital to Risk-Weighted Assets, Actual ratio | 0.1499 | 0.1381
Total Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,562,866 | $ 1,586,821
Total Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio | 0.1050 | 0.1050
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized | $ 1,488,444 | $ 1,511,258
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.10 | 0.1000
Leverage Ratio, Actual amount | $ 2,059,056 | $ 1,959,832
Leverage Ratio, Actual ratio | 0.1119 | 0.1123
Leverage Ratio, Minimum Capital Required | $ 736,317 | $ 697,976
Leverage Ratio Minimum Capital Required, Ratio | 0.0400 | 0.0400
Leverage Ratio, Required to be Considered Well Capitalized | $ 920,396 | $ 872,470
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 | $ 2,016,448 | $ 1,892,321
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio | 13.53% | 12.51%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required | $ 1,042,967 | $ 1,059,259
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 | $ 968,470 | $ 983,597
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 | $ 2,016,448 | $ 1,892,321
Tier 1 Capital to Risk-Weighted Assets, Actual ratio | 0.1353 | 0.1251
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,266,460 | $ 1,286,243
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio | 0.0850 | 0.0850
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized | $ 1,191,963 | $ 1,210,581
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 | $ 2,304,366 | $ 2,134,900
Total Capital to Risk-Weighted Assets, Actual ratio | 0.1547 | 0.1411
Total Capital to Risk-Weighted Assets, Minimum Capital Required | $ 1,564,451 | $ 1,588,888
Total Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio | 0.1050 | 0.1050
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized | $ 1,489,953 | $ 1,513,227
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 0.1000 | 0.1000
Leverage Ratio, Actual amount | $ 2,016,448 | $ 1,892,321
Leverage Ratio, Actual ratio | 0.1094 | 0.1083
Leverage Ratio, Minimum Capital Required | $ 737,382 | $ 699,173
Leverage Ratio Minimum Capital Required, Ratio | 0.0400 | 0.0400
Leverage Ratio, Required to be Considered Well Capitalized | $ 921,727 | $ 873,966
Leverage Ratio Required to be Considered Well Capitalized, Ratio | 0.0500 | 0.0500

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- Definition The Common Equity Tier 1 capital ratio (Common EquityTier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References No definition available. + Details
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