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Note 21 - Regulatory Matters - Capital and Leverage Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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