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Stockholders' Equity (Compliance with Regulatory Capital Requirements) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Hancock Holding Company [Member] |  |
Tier 1 leverage capital, Actual, Amount | $ 2,214,723 | $ 2,184,812
Common equity tier 1 (to risk weighted assets), Actual, Amount | 2,214,723 | 2,184,812
Tier 1 capital (to risk weighted assets), Actual, Amount | 2,214,723 | 2,184,812
Total capital (to risk weighted assets), Actual, Amount | $ 2,582,031 | $ 2,564,230
Tier 1 leverage capital, Actual, Ratio % | 8.43% | 9.56%
Common equity tier 1 (to risk weighted assets), Actual, Ratio % | 10.21% | 11.26%
Tier 1 capital (to risk weighted assets), Actual, Ratio % | 10.21% | 11.26%
Total capital (to risk weighted assets), Actual, Ratio % | 11.90% | 13.21%
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount | $ 1,051,025 | $ 914,520
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 976,303 | 873,192
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 1,301,738 | 1,164,256
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | $ 1,735,650 | $ 1,552,341
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 | $ 1,313,781 | $ 1,143,150
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,410,216 | 1,261,277
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,735,650 | 1,552,341
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount | $ 2,169,563 | $ 1,940,427
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 | $ 2,282,485 | $ 2,011,719
Common equity tier 1 (to risk weighted assets), Actual, Amount | 2,282,485 | 2,011,719
Tier 1 capital (to risk weighted assets), Actual, Amount | 2,282,485 | 2,011,719
Total capital (to risk weighted assets), Actual, Amount | $ 2,499,793 | $ 2,241,137
Tier 1 leverage capital, Actual, Ratio % | 8.72% | 8.83%
Common equity tier 1 (to risk weighted assets), Actual, Ratio % | 10.54% | 10.39%
Tier 1 capital (to risk weighted assets), Actual, Ratio % | 10.54% | 10.39%
Total capital (to risk weighted assets), Actual, Ratio % | 11.55% | 11.57%
Tier 1 leverage capital, Required for Minimum Capital Adequacy, Amount | $ 1,046,644 | $ 911,091
Common equity tier 1 (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 974,362 | 871,361
Tier 1 capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | 1,299,150 | 1,161,815
Total capital (to risk weighted assets), Required for Minimum Capital Adequacy, Amount | $ 1,732,200 | $ 1,549,086
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 | $ 1,308,305 | $ 1,138,864
Common equity tier 1 (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,407,412 | 1,258,633
Tier 1 capital (to risk weighted assets), Required To Be Well Capitalized, Amount | 1,732,200 | 1,549,086
Total capital (to risk weighted assets), Required To Be Well Capitalized, Amount | $ 2,165,250 | $ 1,936,358
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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