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Activity in Goodwill, by Reporting Unit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Beginning balance, January 1,	$ 100,722	$ 105,455	$ 104,866
Acquisitions and dispositions, net	(324)	(6,454)	148
Cash consideration paid	88	1,721	441
Ending balance, December 31,	100,486	100,722	105,455
Community Banking
Goodwill [Line Items]
Beginning balance, January 1,	91,455	96,541	96,717
Acquisitions and dispositions, net		(6,454)	(176)
Cash consideration paid		1,368
Ending balance, December 31,	91,455	91,455	96,541
Insurance Services
Goodwill [Line Items]
Beginning balance, January 1,	9,267	8,914	8,149
Acquisitions and dispositions, net	(324)		324
Cash consideration paid	88	353	441
Ending balance, December 31,	$ 9,031	$ 9,267	$ 8,914

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Goodwill Acquired and Disposed During Period, Net

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460

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