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Investment Securities Contractual Maturities of Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
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Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Amortized Cost | $ 13,854 | $ 18,761 | $ 5,894
Due in 1 to 5 years, Securities available for sale, Amortized Cost | 24,804 | 27,243 | 59,887
Due in 5 to 10 years, Securities available for sale, Amortized Cost | 13,683 | 16,686 | 13,014
Due after 10 years, Securities available for sale, Amortized Cost | 224,029 | 215,131 | 225,548
Equity securities, Amortized Cost | 1,578 | 1,578 | 1,863
Securities available for sale, Amortized Cost | 277,948 | 279,399 | 306,206
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Fair Value (Estimated) | 14,054 | 18,926 | 5,948
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) | 25,288 | 27,816 | 60,971
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) | 14,560 | 17,666 | 13,442
Due after 10 years, Securities available for sale, Fair Value (Estimated) | 230,895 | 225,629 | 234,916
Equity securities, Fair Value (Estimated) | 1,572 | 1,577 | 1,834
Fair Value (Estimated) | 286,369 | 291,614 | 317,111
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] |  |  |
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost | 27,914 | 27,461 | 35,563
Due in 1 year or less, Securities available to be held to maturity, Amortized Cost | 3,034 | 3,754 | 4,663
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost | 22,651 | 11,950 | 12,173
Due after 10 years, Securities to be held to maturity, Amortized Cost | 97,192 | 100,155 | 85,207
Securities to be held to maturity, Amortized Cost | 150,791 | 143,320 | 137,606
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available to be held to maturity, Fair Value (Estimated) | 3,065 | 3,785 | 4,710
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) | 23,118 | 12,701 | 12,940
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) | 30,237 | 29,986 | 38,100
Due after 10 years, Securiteis to be held to maturity, Fair Value (Estimated) | 100,132 | 103,775 | 88,883
Fair Value (Estimated) | $ 156,552 | $ 150,247 | $ 144,633

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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + 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 20 -Subparagraph a -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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