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Covered Assets and Indemnification Asset (Details 2) (Covered, PCI loans, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Covered | PCI loans
     
Carrying value and the outstanding contractual balance of the covered PCI loans      
Carrying amount $ 360,095us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
  $ 435,388us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
Outstanding balance 599,104us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
  685,393us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
Changes in the accretable yield for the covered PCI loans      
Balance, beginning of period 193,493us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
156,548us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
 
Reclassifications from (to) nonaccretable difference, net( 16,263hth_IncreasesInExpectedCashFlows
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
30,710hth_IncreasesInExpectedCashFlows
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
 
Transfer of loans to covered OREO 1,172hth_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldTransferOfLoansToCoveredOtherRealEstateOwned
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
5,261hth_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldTransferOfLoansToCoveredOtherRealEstateOwned
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
 
Accretion (16,931)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
(16,050)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldAccretion
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
 
Balance, end of period $ 193,997us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember
$ 176,469us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hth_LoansImpairedAtAcquisitionMember
/ hth_ReceivableByIndemnificationStatusAxis
= hth_CoveredMember