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

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Covered Assets and Indemnification Asset (Details 3) (Covered, USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended
	Mar. 31, 2015 item	Mar. 31, 2014 item	Mar. 31, 2014	Dec. 31, 2014
Covered PCI loans
Non-accrual loans	$ 14,749			$ 34,223
Number of TDRs granted	1	0
Secured
Covered PCI loans
Non-accrual loans	585			442
Unsecured
Covered PCI loans
Non-accrual loans				883
Secured by commercial properties
Covered PCI loans
Non-accrual loans	11,504			30,823
Number of TDRs granted	1
Secured by residential properties
Covered PCI loans
Non-accrual loans	1,620			1,046
Residential construction loans
Covered PCI loans
Non-accrual loans	1,013			1,018
Commercial construction loans and land development
Covered PCI loans
Non-accrual loans	27			11
PCI loans
Covered PCI loans
Unpaid Contractual Principal Balance	679,971			761,063
Recorded Investment with No Allowance	294,633			378,889
Recorded Investment with Allowance	69,511			59,747
Total Recorded Investment	364,144			438,636
Related Allowance	1,316			4,534
Average investment	401,391		690,542
Non-accrual loans	11,000			31,200
PCI loans \| Secured
Covered PCI loans
Unpaid Contractual Principal Balance	23,821			26,447
Recorded Investment with No Allowance	6,398			7,436
Recorded Investment with Allowance	5,870			6,636
Total Recorded Investment	12,268			14,072
Related Allowance	324			265
Average investment	13,170		25,381
PCI loans \| Unsecured
Covered PCI loans
Unpaid Contractual Principal Balance	13,217			14,111
Recorded Investment with No Allowance	1,693			2,107
Recorded Investment with Allowance	3,204			4,697
Total Recorded Investment	4,897			6,804
Related Allowance				882
Average investment	5,851		9,429
PCI loans \| Secured by commercial properties
Covered PCI loans
Unpaid Contractual Principal Balance	335,149			387,302
Recorded Investment with No Allowance	119,551			193,111
Recorded Investment with Allowance	59,208			35,142
Total Recorded Investment	178,759			228,253
Related Allowance	906			2,381
Average investment	203,506		352,334
PCI loans \| Secured by residential properties
Covered PCI loans
Unpaid Contractual Principal Balance	219,650			235,505
Recorded Investment with No Allowance	127,424			129,571
Recorded Investment with Allowance	415			12,918
Total Recorded Investment	127,839			142,489
Related Allowance	1			937
Average investment	135,164		193,681
PCI loans \| Residential construction loans
Covered PCI loans
Unpaid Contractual Principal Balance	2,321			2,749
Recorded Investment with No Allowance	1,013			1,018
Recorded Investment with Allowance	287			354
Total Recorded Investment	1,300			1,372
Related Allowance	85			69
Average investment	1,336		3,534
PCI loans \| Commercial construction loans and land development
Covered PCI loans
Unpaid Contractual Principal Balance	85,813			94,949
Recorded Investment with No Allowance	38,554			45,646
Recorded Investment with Allowance	527
Total Recorded Investment	39,081			45,646
Average investment	42,364		106,183
Other than PCI Loans
Covered PCI loans
Total Recorded Investment	$ 332,500			$ 382,500