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Real Estate and Other Assets Acquired in Settlement of Loans (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of activity in valuation allowance for other real estate owned in settlement of loans |  |  |
Balance, beginning of year | $ 4,675 us-gaap_RealEstateOwnedValuationAllowance | $ 6,137 us-gaap_RealEstateOwnedValuationAllowance | $ 6,977 us-gaap_RealEstateOwnedValuationAllowance
Provision for other real estate owned | 585 us-gaap_RealEstateOwnedValuationAllowanceProvision1 | 3,367 us-gaap_RealEstateOwnedValuationAllowanceProvision1 | 713 us-gaap_RealEstateOwnedValuationAllowanceProvision1
Charge-offs | (2,005)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied | (4,829)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied | (1,553)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied
Balance, end of year | $ 3,255 us-gaap_RealEstateOwnedValuationAllowance | $ 4,675 us-gaap_RealEstateOwnedValuationAllowance | $ 6,137 us-gaap_RealEstateOwnedValuationAllowance

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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
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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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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