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Activity in Goodwill, by Reporting Unit (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended						12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Community Banking	Dec. 31, 2012 Community Banking	Dec. 31, 2010 Community Banking	Dec. 31, 2013 Insurance Services	Dec. 31, 2012 Insurance Services	Dec. 31, 2011 Insurance Services
Goodwill [Line Items]
Beginning balance, January 1, 2011	$ 104,866	$ 83,056	$ 84,914	$ 96,717	$ 75,599	$ 75,599	$ 8,149	$ 7,457	$ 9,315
Acquisitions and dispositions, net	148	21,118	(1,299)	(176)	21,118		324		(1,299)
Cash consideration paid	441	692	680				441	692	680
Impairment Charges			(1,239)						(1,239)
Ending balance, December 31, 2011	$ 105,455	$ 104,866	$ 83,056	$ 96,541	$ 96,717	$ 75,599	$ 8,914	$ 8,149	$ 7,457

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Goodwill Acquired and Disposed During Period, Net

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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.

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Amount of loss from the write-down 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.

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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.

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