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Allowance For Loan Losses for PCI Loans, by Loan Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 20,227	$ 24,077	$ 25,770
(Recovery of) provision for PCI loan losses			8,659
Benefit attributable to FDIC indemnification asset	29	422	(451)
(Recovery of) provision for loan losses charged to operations	2,191	145	8,208
Provision for (Recovery of)loan losses recorded through the FDIC indemnification asset	(29)	(422)	451
Ending balance	20,233	20,227	24,077
Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	58	755	8
(Recovery of) provision for PCI loan losses	(4)	(697)	747
Benefit attributable to FDIC indemnification asset	29	422	(451)
(Recovery of) provision for loan losses charged to operations	25	(275)	296
Provision for (Recovery of)loan losses recorded through the FDIC indemnification asset	(29)	(422)	451
Provision for (Recovery of)loan losses recorded through the FDIC indemnification asset			451
Ending balance	54	58	755
Commercial Loans | Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	37	77	8
(Recovery of) provision for PCI loan losses	(37)	(40)	69
Benefit attributable to FDIC indemnification asset	29	26	(55)
(Recovery of) provision for loan losses charged to operations	(8)	(14)	14
Provision for (Recovery of)loan losses recorded through the FDIC indemnification asset	(29)	(26)
Provision for (Recovery of)loan losses recorded through the FDIC indemnification asset			55
Ending balance		37	77
Consumer Real Estate | Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	21	678
(Recovery of) provision for PCI loan losses	33	(657)	678
Benefit attributable to FDIC indemnification asset		396	(396)
(Recovery of) provision for loan losses charged to operations	33	(261)	282
Provision for (Recovery of)loan losses recorded through the FDIC indemnification asset		(396)
Provision for (Recovery of)loan losses recorded through the FDIC indemnification asset			396
Ending balance	$ 54	$ 21	$ 678

X

- Definition

(Provision) Benefit for Loan Losses

+ References

No definition available.

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- Definition

Provision for (Recovery of) Loan and Lease Losses

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- Definition

Provision For (Recovery) of Loan Losses Recorded Through FDIC Indemnification Asset

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- 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=49124121&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))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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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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 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
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-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 5: 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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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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