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Allowance for Loan Losses, Excluding 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
Removal of loans transferred		(682)
(Recovery of) provision for loan losses charged to operations	2,191	145	8,208
Loans charged off	(3,745)	(6,481)	(12,527)
Recoveries credited to allowance	1,589	3,590	2,175
Net (charge-offs) recoveries	(2,156)	(2,891)	(10,352)
Ending balance	20,233	20,227	24,077
Allowance Excluding Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	20,169	23,322	25,762
Removal of loans transferred		(682)
(Recovery of) provision for loan losses charged to operations	2,166	420	7,912
Loans charged off	(3,745)	(6,481)	(12,527)
Recoveries credited to allowance	1,589	3,590	2,175
Net (charge-offs) recoveries	(2,156)	(2,891)	(10,352)
Ending balance	20,179	20,169	23,322
Commercial Loans | Allowance Excluding Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	13,010	16,090	17,259
Removal of loans transferred		(418)
(Recovery of) provision for loan losses charged to operations	931	(1,988)	5,643
Loans charged off	(1,282)	(2,928)	(7,743)
Recoveries credited to allowance	474	2,254	931
Net (charge-offs) recoveries	(808)	(674)	(6,812)
Ending balance	13,133	13,010	16,090
Consumer Real Estate | Allowance Excluding Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	6,489	6,597	7,906
Removal of loans transferred		(244)
(Recovery of) provision for loan losses charged to operations	95	1,273	1,364
Loans charged off	(906)	(1,873)	(3,115)
Recoveries credited to allowance	678	736	442
Net (charge-offs) recoveries	(228)	(1,137)	(2,673)
Ending balance	6,356	6,489	6,597
Consumer and Other | Allowance Excluding Purchased Credit Impaired
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	670	635	597
Removal of loans transferred		(20)
(Recovery of) provision for loan losses charged to operations	1,140	1,135	905
Loans charged off	(1,557)	(1,680)	(1,669)
Recoveries credited to allowance	437	600	802
Net (charge-offs) recoveries	(1,120)	(1,080)	(867)
Ending balance	$ 690	$ 670	$ 635

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- Definition

Provision for (Recovery of) Loan and Lease Losses

+ References

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ 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 (c)(4)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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- Definition

Amount of reduction of allowance reserve for credit loss arising from sale 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
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-Section S99
-Paragraph 1
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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ 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 (c)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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Amount, after recoveries, of loans and leases that have been written-off.

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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
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-Topic 942
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-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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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