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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Fair Value Measurements |  |
Transfers into or out of Levels 1-3 | $ 0 | $ 0
Assets: |  |
Available for sale debt securities, fair value | 213,629 | 200,246
Mortgage servicing rights, fair value | 3,079 | 2,549
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Assets, Total | 31,735 | 66,097
Other Observable Inputs (Level 2) |  |
Assets: |  |
Assets, Total | 217,170 | 202,630
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Mortgage servicing rights, fair value | 3,079 | 2,549
Assets, Total | 821,439 | 837,373
Recurring |  |
Assets: |  |
Assets, Total | 216,708 | 202,795
Recurring | U.S. Treasury |  |
Assets: |  |
Available for sale debt securities, fair value | 1,006 | 2,030
Recurring | Government sponsored enterprises |  |
Assets: |  |
Available for sale debt securities, fair value | 63,838 | 55,180
Recurring | Asset-backed securities |  |
Assets: |  |
Available for sale debt securities, fair value | 114,079 | 107,872
Recurring | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities, fair value | 34,706 | 35,164
Recurring | Mortgage servicing rights |  |
Assets: |  |
Mortgage servicing rights, fair value | 3,079 | 2,549
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Assets, Total | 1,006 | 2,030
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury |  |
Assets: |  |
Available for sale debt securities, fair value | 1,006 | 2,030
Recurring | Other Observable Inputs (Level 2) |  |
Assets: |  |
Assets, Total | 212,623 | 198,216
Recurring | Other Observable Inputs (Level 2) | Government sponsored enterprises |  |
Assets: |  |
Available for sale debt securities, fair value | 63,838 | 55,180
Recurring | Other Observable Inputs (Level 2) | Asset-backed securities |  |
Assets: |  |
Available for sale debt securities, fair value | 114,079 | 107,872
Recurring | Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities, fair value | 34,706 | 35,164
Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Assets, Total | 3,079 | 2,549
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights |  |
Assets: |  |
Mortgage servicing rights, fair value | $ 3,079 | $ 2,549

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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