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Fair Market Value of Financial Assets and Liabilities, Transfers between Levels (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
U.S. government sponsored agency mortgage-backed securities [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Description | Quoted prices in exact security not available on the measurement date
Fair Value, Assets, Level 2 to Level 1 Transfers, Description | Quoted prices in exact security not available on the measurement date
Marketable equity securities [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Description | Quoted prices available on the measurement date
Fair Value, Assets, Level 2 to Level 1 Transfers, Description | Quoted prices available on the measurement date
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 464
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 323
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. government sponsored agency mortgage-backed securities [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 464
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Marketable equity securities [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 323
Significant Other Observable Inputs (Level 2) [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 323
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 464
Significant Other Observable Inputs (Level 2) [Member] | U.S. government sponsored agency mortgage-backed securities [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 464
Significant Other Observable Inputs (Level 2) [Member] | Marketable equity securities [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 323
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0
Significant Unobservable Inputs (Level 3) [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0
Significant Unobservable Inputs (Level 3) [Member] | U.S. government sponsored agency mortgage-backed securities [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0
Significant Unobservable Inputs (Level 3) [Member] | Marketable equity securities [Member] |
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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Period Type: | instant

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- Definition Description of the transfers of assets measured on a recurring basis out of Level 1 and into Level 2 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Description of the transfers of assets measured on a recurring basis out of Level 2 and into Level 1 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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