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2. Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Investment securities available for sale |  |
Estimated Fair Value | $ 293,151 | $ 297,823
Mortgage-backed securities |  |
Investment securities available for sale |  |
Amortized Cost | 120,413 | 146,755
Gross Unrealized Gains | 937 | 1,875
Gross Unrealized Losses | 573 | 606
Estimated Fair Value | 120,777 | 148,024
U.S. Government sponsored enterprises |  |
Investment securities available for sale |  |
Amortized Cost | 19,251 | 18,714
Gross Unrealized Gains | 318 | 203
Gross Unrealized Losses | 0 | 80
Estimated Fair Value | 19,569 | 18,837
State and political subdivisions |  |
Investment securities available for sale |  |
Amortized Cost | 147,160 | 118,591
Gross Unrealized Gains | 2,637 | 7,171
Gross Unrealized Losses | 3,333 | 104
Estimated Fair Value | 146,464 | 125,658
Corporate bonds |  |
Investment securities available for sale |  |
Amortized Cost | 3,548 | 2,571
Gross Unrealized Gains | 20 | 19
Gross Unrealized Losses | 78 | 4
Estimated Fair Value | 3,490 | 2,586
Trust preferred securities |  |
Investment securities available for sale |  |
Amortized Cost | 1,250 | 1,250
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1,250 | 1,250
Equity securities |  |
Investment securities available for sale |  |
Amortized Cost | 748 | 748
Gross Unrealized Gains | 853 | 720
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 1,601 | 1,468
Total |  |
Investment securities available for sale |  |
Amortized Cost | 292,370 | 288,629
Gross Unrealized Gains | 4,765 | 9,988
Gross Unrealized Losses | 3,984 | 794
Estimated Fair Value | $ 293,151 | $ 297,823

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- Definition Amount of investment in debt and equity 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 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: 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 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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