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Stockholders' Equity (Compliance with Regulatory Capital Requirements) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Tier 1 leverage capital, Actual, Amount | $ 2,584,162 | $ 2,391,762
Common equity tier 1 (to risk weighted assets), Actual, Amount | 2,584,162 | 2,391,762
Tier 1 capital (to risk weighted assets), Actual, Amount | 2,584,162 | 2,391,762
Total capital (to risk weighted assets), Actual, Amount | $ 2,929,387 | $ 2,736,276
Tier 1 leverage capital, Actual, Ratio % | 8.76% | 8.67%
Common equity tier 1 (to risk weighted assets), Actual, Ratio % | 10.50% | 10.48%
Tier 1 capital (to risk weighted assets), Actual, Ratio % | 10.50% | 10.48%
Total capital (to risk weighted assets), Actual, Ratio % | 11.90% | 11.99%
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount | $ 1,180,163 | $ 1,103,544
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 1,107,527 | 1,026,637
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 1,476,702 | 1,368,849
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | $ 1,968,936 | $ 1,825,132
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Ratio % | 4.00% | 4.00%
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % | 4.50% | 4.50%
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % | 6.00% | 6.00%
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % | 8.00% | 8.00%
Tier 1 leverage capital, Required To Be Well Capitalized, Amount | $ 1,475,204 | $ 1,379,430
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,599,761 | 1,482,920
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,968,936 | 1,825,132
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount | $ 2,461,171 | $ 2,281,415
Tier 1 leverage capital, Required To Be Well Capitalized, Ratio % | 5.00% | 5.00%
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Ratio % | 6.50% | 6.50%
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Ratio % | 8.00% | 8.00%
Total capital (to risk weighted assets), Required To Be Well Capitalized, Ratio % | 10.00% | 10.00%
Hancock Whitney Bank [Member] |  |
Tier 1 leverage capital, Actual, Amount | $ 2,640,913 | $ 2,351,090
Common equity tier 1 (to risk weighted assets), Actual, Amount | 2,640,913 | 2,351,090
Tier 1 capital (to risk weighted assets), Actual, Amount | 2,640,913 | 2,351,090
Total capital (to risk weighted assets), Actual, Amount | $ 2,836,138 | $ 2,545,604
Tier 1 leverage capital, Actual, Ratio % | 8.96% | 8.54%
Common equity tier 1 (to risk weighted assets), Actual, Ratio % | 10.74% | 10.32%
Tier 1 capital (to risk weighted assets), Actual, Ratio % | 10.74% | 10.32%
Total capital (to risk weighted assets), Actual, Ratio % | 11.53% | 11.17%
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount | $ 1,179,194 | $ 1,101,372
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 1,106,558 | 1,025,355
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 1,475,411 | 1,367,140
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | $ 1,967,214 | $ 1,822,053
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Ratio % | 4.00% | 4.00%
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % | 4.50% | 4.50%
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % | 6.00% | 6.00%
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Ratio % | 8.00% | 8.00%
Tier 1 leverage capital, Required To Be Well Capitalized, Amount | $ 1,473,992 | $ 1,376,715
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,598,362 | 1,481,068
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,967,214 | 1,822,853
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount | $ 2,459,018 | $ 2,278,566
Tier 1 leverage capital, Required To Be Well Capitalized, Ratio % | 5.00% | 5.00%
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Ratio % | 6.50% | 6.50%
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Ratio % | 8.00% | 8.00%
Total capital (to risk weighted assets), Required To Be Well Capitalized, Ratio % | 10.00% | 10.00%

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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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