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Commitments and Unfunded Credits - Financial Instruments Representing Credit Risk (Detail) (First Bank [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Commitments to Extend Credit and Unfunded Commitments Under Lines of Credit [Member] |  |
Other Commitments [Line Items] |  |
Contract amounts represent credit risk | $ 59,115 | $ 52,849
Stand-By Letters of Credit [Member] |  |
Other Commitments [Line Items] |  |
Contract amounts represent credit risk | $ 7,610 | $ 8,306

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- Definition The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration