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Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Finite-Lived Intangible Assets [Line Items] |  |
Other intangible assets | $ 5,759 | $ 8,147
Core deposits [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Other intangible assets | 3,537 | 5,296
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Other intangible assets | 1,796 | 2,262
Non-compete agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Other intangible assets | $ 426 | $ 589

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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