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Other Comprehensive Income (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Summary of change in accumulated other comprehensive income (loss) |  |  |  |
Unrealized gains (losses) on securities available for sale, Beginning Balance | $ 12,478 | $ (1,963) | $ (4,517) |
Unrealized gains (losses) on securities available for sale | 3,561 | 14,441 | 2,554 |
Unrealized gains (losses) on securities available for sale, Ending Balance | 16,039 | 12,478 | (1,963) |
Unrealized gain (loss) on postretirement benefits plan, Beginning Balance | (632) | (147) | 98 |
Unrealized gain (loss) on postretirement benefits plan | (349) | (485) | (245) |
Unrealized gain (loss) on postretirement benefits plan, Ending Balance | (981) | (632) | (147) |
Unrealized gain (loss) on interest rate swap, Beginning Balance | (1,085) | (563) | (456) |
Unrealized gain (loss) on interest rate swap | (49) | (522) | (107) |
Unrealized gain (loss) on interest rate swap Ending Balance | (1,134) | (1,085) | (563) |
Total | 13,924 | 10,761 | (2,673) | (4,875)
Unrealized gain (loss), net of increase (decrease) | $ 3,163 | $ 13,434 | $ 2,202 |

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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