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Allowance For Loan Losses for PCI Loans, by Loan Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 23,911	$ 23,122	$ 24,077	$ 25,770
Purchased impaired provision (recovery)	(2,549)	3,145	182	7,492
Benefit attributable to FDIC indemnification asset	110	(812)	451	(812)
Provision for (recovery of) loan losses charged to operations	(2,439)	2,333	633	6,680
Provision for (recovery of)loan losses recorded through the FDIC indemnification asset			(633)	(6,680)
Ending balance	21,159	24,665	21,159	24,665
Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	418	8	755	8
Purchased impaired provision (recovery)	(214)	1,035	(551)	1,035
Benefit attributable to FDIC indemnification asset	110	(812)	451	(812)
Provision for (recovery of) loan losses charged to operations	(104)	223	(100)	223
Provision for (recovery of)loan losses recorded through the FDIC indemnification asset	(110)	812	(451)	812
Ending balance	204	1,043	204	1,043
Commercial Loans | Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	16	8	77	8
Purchased impaired provision (recovery)	(8)	158	(69)	158
Benefit attributable to FDIC indemnification asset		(242)	55	(242)
Provision for (recovery of) loan losses charged to operations	(8)	(84)	(14)	(84)
Provision for (recovery of)loan losses recorded through the FDIC indemnification asset		242	(55)	242
Ending balance	8	166	8	166
Consumer Real Estate | Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	402		678
Purchased impaired provision (recovery)	(206)	877	(482)	877
Benefit attributable to FDIC indemnification asset	110	(570)	396	(570)
Provision for (recovery of) loan losses charged to operations	(96)	307	(86)	307
Provision for (recovery of)loan losses recorded through the FDIC indemnification asset	(110)	570	(396)	570
Ending balance	$ 196	$ 877	$ 196	$ 877

X

- Definition

(Provision) Benefit for Loan Losses

+ References

No definition available.

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X

- Definition

Provision for (Recovery of) Loan and Lease Losses

+ References

No definition available.

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X

- Definition

Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-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 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Name Regulation S-X (SX)

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-Name Accounting Standards Codification

-Topic 310

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-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524



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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

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

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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