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Other Real Estate Owned (OREO) - Summary of Changes in the Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Real Estate [Abstract] |  |  |
Balance at beginning of year | $ 375 us-gaap_RealEstateOwnedValuationAllowance | $ 1,665 us-gaap_RealEstateOwnedValuationAllowance | $ 1,665 us-gaap_RealEstateOwnedValuationAllowance
Provision for losses |  | 23 us-gaap_RealEstateOwnedValuationAllowanceProvision1 | 12 us-gaap_RealEstateOwnedValuationAllowanceProvision1
Charge-offs, net | (250)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied | (2)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied | (1,302)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied
Balance at end of period | $ 125 us-gaap_RealEstateOwnedValuationAllowance | $ 1,686 us-gaap_RealEstateOwnedValuationAllowance | $ 375 us-gaap_RealEstateOwnedValuationAllowance

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

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- Definition For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 4 -Article 9 + Details
Name: | us-gaap_RealEstateOwnedValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of the valuation allowance for real estate owned that was applied in the period against the carrying amount of real estate owned that was sold, written down or written off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 4 -Article 9 + Details
Name: | us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of expense recognized in the income statement for a decrease in valuation of real estate owned (REO). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_RealEstateOwnedValuationAllowanceProvision1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration