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Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Amortized cost | $ 226,682 | $ 207,826
Gross unrealized gains | 5,560 | 5,676
Gross unrealized losses | (256) | (202)
Estimated fair value | 231,986 | 213,300
US Treasury Securities [Member] |  |
Amortized cost | 500 |
Gross unrealized gains | 1 |
Gross unrealized losses | 0 |
Estimated fair value | 501 |
Agency Securities [Member] |  |
Amortized cost | 14,598 | 8,804
Gross unrealized gains | 46 | 50
Gross unrealized losses | (24) | (6)
Estimated fair value | 14,620 | 8,848
Nontaxable Municipal Bonds [Member] |  |
Amortized cost | 79,495 | 73,699
Gross unrealized gains | 3,293 | 3,618
Gross unrealized losses | (61) | (31)
Estimated fair value | 82,727 | 77,286
Taxable Municipal Bonds [Member] |  |
Amortized cost | 47,598 | 37,334
Gross unrealized gains | 889 | 818
Gross unrealized losses | (99) | (10)
Estimated fair value | 48,388 | 38,142
Collateralized Mortgage Backed Securities [Member] |  |
Amortized cost | 77,135 | 81,113
Gross unrealized gains | 926 | 889
Gross unrealized losses | (72) | (154)
Estimated fair value | 77,989 | 81,848
Certificates Of Deposit [Member] |  |
Amortized cost | 6,754 | 6,274
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 6,754 | 6,274
Common Stock [Member] |  |
Amortized cost | 602 | 602
Gross unrealized gains | 405 | 301
Gross unrealized losses | 0 | (1)
Estimated fair value | $ 1,007 | $ 902

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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. + Details
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