Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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- Definition

Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Not Designated as Hedging Instrument \| PrimeLending
Derivative financial instruments
Net gain (loss) due to changes in the fair value of the derivative instruments	$ (9,900)	$ 1,200	$ (400)	$ (13,000)
Not Designated as Hedging Instrument \| PlainsCapital
Derivative financial instruments
Net gain (loss) due to changes in the fair value of the derivative instruments	49	300	200	(300)
Not Designated as Hedging Instrument \| Hilltop Broker-Dealers
Derivative financial instruments
Net gain (loss) due to changes in the fair value of the derivative instruments	(3,600)	$ (8,500)	12,600	$ 1,000
Interest Rate Lock Commitments
Derivative financial instruments
Notional Amount	1,248,422		1,248,422		$ 944,550
Estimated Fair Value	28,601		28,601		23,269
Customer-based written options
Derivative financial instruments
Notional Amount	14,930		14,930
Estimated Fair Value	30		30
Customer-based purchased options
Derivative financial instruments
Notional Amount	14,930		14,930
Estimated Fair Value	(30)		(30)
Commitments to Purchase MBSs
Derivative financial instruments
Notional Amount	3,198,208		3,198,208		3,616,922
Estimated Fair Value	7,040		7,040		(1,155)
Commitments to Sell MBSs
Derivative financial instruments
Notional Amount	5,878,986		5,878,986		5,609,250
Estimated Fair Value	2,517		2,517		(532)
Commitments to Sell MBSs \| PrimeLending
Derivative financial instruments
Cash collateral advanced to offset net derivative liability	3,700		3,700		19,100
Interest Rate Swap and Swaptions
Derivative financial instruments
Notional Amount	28,152		28,152		32,452
Estimated Fair Value	(95)		(95)		(283)
U.S. Treasury bond futures and options
Derivative financial instruments
Notional Amount	194,000		194,000		297,000
U.S. Treasury bond futures and options \| PrimeLending
Derivative financial instruments
Cash collateral advanced to offset net derivative liability	$ 3,200		$ 3,200		$ 3,200