Debt instrument maturities month year.

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
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- Details

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- Details

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Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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- Details

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Namespace Prefix:
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- Details

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- Details

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OTHER BORROWINGS [Parenthetical] (Details)	6 Months Ended
OTHER BORROWINGS [Parenthetical] (Details)	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Daily Rate Credit From Federal Home Loan Bank [Member]
Other Borrowings [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	0.57%
Revolving Credit Facility [Member]
Other Borrowings [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	8.00%
Debt instrument, maturity period	January 31, 2017
Revolving Credit Facility One [Member]
Other Borrowings [Line Items]
Debt Instrument, Description of Variable Rate Basis	Advances under revolving credit agreement with a regional bank with interest at 90-day LIBOR plus 3.50% (4.17% at June 30, 2016, 3.92% at December 31, 2015, and 3.78% at June 30, 2015) due in August 2017, secured by subsidiary bank stock
Debt Instrument, Interest Rate, Effective Percentage	4.17%	3.92%	3.78%
Debt instrument, maturity period	August 31, 2017
Correspondent Bank Advances [Member]
Other Borrowings [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.25%
Maturity period of advances	Oct. 15, 2019
Fixed Rate Advance One [Member]
Other Borrowings [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.81%
Maturity period of advances	Jul. 15, 2016
Fixed Rate Advance Two [Member]
Other Borrowings [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.40%
Maturity period of advances	Jan. 09, 2017
Fixed Rate Advance Three [Member]
Other Borrowings [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.23%
Maturity period of advances	May 30, 2017
Subordinated Debt [Member]
Other Borrowings [Line Items]
Debt Instrument, Description of Variable Rate Basis	Subordinated debt issued by The Prosperity Banking Company due September 2016 with an interest rate of 90-day LIBOR plus 1.75% (2.40% at June 30, 2016, 2.28% at December 31, 2015 and 2.04% at June 30, 2015)
Debt Instrument, Interest Rate, Effective Percentage	2.40%	2.28%	2.04%
Fixed Rate Advance [Member]
Other Borrowings [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	0.40%
Maturity period of advances	Jul. 15, 2016