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Deposits - Additional Information (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Banking and Thrift [Abstract] |  |
Aggregate amount of deposits reclassified as loans | $ 463,000 us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1 | $ 405,000 us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Deposit liabilities with abnormal terms | $ 0 us-gaap_DepositLiabilitiesWithAbnormalTerms | $ 0 us-gaap_DepositLiabilitiesWithAbnormalTerms

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

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- Definition Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of deposits held by the entity on terms other than those available in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818 + Details
Name: | us-gaap_DepositLiabilitiesWithAbnormalTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant