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Loan Servicing - Activity Related to Servicing Assets (Parenthetical) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Acquired in the acquisition of GSFC | $ 101,000 | $ 261,000 | $ 529,000
GS Financial Corporation [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Acquired in the acquisition of GSFC |  |  | $ 404,000

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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Balance Type: | debit
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