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Loans and Allowance for Credit Losses (Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Receivables [Abstract] |
Carrying Amount of Loans, Balance at beginning of period | $ 129,596
Carrying Amount of Loans, Additions | 120,562
Carrying Amount of Loans, Payments received, net | (48,076)
Carrying Amount of Loans, Accretion | 13,163
Carrying Amount of Loans, Balance at end of period | 215,245
Accretable Yield, Balance at beginning of period | 37,294
Accretable Yield, Additions | 6,246
Accretable Yield, Payments received, net | (4,601)
Accretable Yield, Accretion | (13,163)
Accretable Yield, Decrease in expected cash flows based on actual cash flows and changes in cash flow assumptions | 4,170
Accretable Yield, Balance at end of period | $ 29,946

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- Definition Certain loans acquired in transfer not accounted for as debt securities accretable yield acquired in acquisition. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Certain loans acquired in transfer not accounted for as debt securities accretable yield payment received net. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Certain loans acquired in transfer not accounted for as debt securities, carrying amount, accretion. + References No definition available. + Details
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- Definition Certain loans acquired in transfer not accounted for as debt securities carrying amount acquired in acquisition. + References No definition available. + Details
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- Definition Certain loans acquired in transfer not accounted for as debt securities, payments received, net. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Loans Accounted For Under ASC 310-30 + References No definition available. + Details
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Namespace Prefix: | hwc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net Accretable Discount Decrease Increase In Expected Cash Flows Based On Actual Cash Flow And Changes In Cash Flow + References No definition available. + Details
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X
- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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- Definition Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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