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Stockholders' Equity (Compliance with Regulatory Capital Requirements) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Hancock [Member] |  |
Tier 1 leverage capital, Actual, Amount | $ 2,184,812 | $ 1,844,992
Common equity tier 1 (to risk weighted assets), Actual, Amount | 2,184,812 | 1,844,992
Tier 1 capital (to risk weighted assets), Actual, Amount | 2,184,812 | 1,844,992
Total capital (to risk weighted assets), Actual, Amount | $ 2,564,230 | $ 2,195,913
Tier 1 leverage capital, Actual, Ratio % | 9.56% | 8.55%
Common equity tier 1 (to risk weighted assets), Actual, Ratio % | 11.26% | 9.96%
Tier 1 capital (to risk weighted assets), Actual, Ratio % | 11.26% | 9.96%
Total capital (to risk weighted assets), Actual, Ratio % | 13.21% | 11.86%
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount | $ 914,520 | $ 863,289
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 873,192 | 833,216
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 1,164,256 | 1,110,954
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | $ 1,552,341 | $ 1,481,272
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 | $ 1,143,150 | $ 1,079,111
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,261,277 | 1,203,534
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,552,341 | 1,481,272
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount | $ 1,940,427 | $ 1,851,590
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%
Whitney Bank [Member] |  |
Tier 1 leverage capital, Actual, Amount | $ 2,011,719 | $ 1,965,332
Common equity tier 1 (to risk weighted assets), Actual, Amount | 2,011,719 | 1,965,332
Tier 1 capital (to risk weighted assets), Actual, Amount | 2,011,719 | 1,965,332
Total capital (to risk weighted assets), Actual, Amount | $ 2,241,137 | $ 2,166,253
Tier 1 leverage capital, Actual, Ratio % | 8.83% | 9.16%
Common equity tier 1 (to risk weighted assets), Actual, Ratio % | 10.39% | 10.64%
Tier 1 capital (to risk weighted assets), Actual, Ratio % | 10.39% | 10.64%
Total capital (to risk weighted assets), Actual, Ratio % | 11.57% | 11.73%
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount | $ 911,091 | $ 858,551
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 871,361 | 830,985
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 1,161,815 | 1,107,980
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | $ 1,549,086 | $ 1,477,306
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 | $ 1,138,864 | $ 1,073,189
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,258,633 | 1,200,312
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,549,086 | 1,477,306
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount | $ 1,936,358 | $ 1,846,633
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 amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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