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Securities (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Summarizes amortized cost and estimated fair values of securities available for sale |  |
Amortized Cost | $ 536,409 | $ 577,931
Gross Unrealized Gains | 9,916 | 14,718
Gross Unrealized Losses | (199) | (149)
Estimated Fair Value | 546,126 | 592,500
U.S. Federal agencies [Member] |  |
Summarizes amortized cost and estimated fair values of securities available for sale |  |
Amortized Cost | 452,554 | 481,486
Gross Unrealized Gains | 3,654 | 6,673
Gross Unrealized Losses | (164) | (116)
Estimated Fair Value | 456,044 | 488,043
Mortgage backed securities [Member] |  |
Summarizes amortized cost and estimated fair values of securities available for sale |  |
Amortized Cost | 19,100 | 28,984
Gross Unrealized Gains | 825 | 615
Gross Unrealized Losses | (1) | (13)
Estimated Fair Value | 19,924 | 29,586
States and political subdivisions [Member] |  |
Summarizes amortized cost and estimated fair values of securities available for sale |  |
Amortized Cost | 53,912 | 60,239
Gross Unrealized Gains | 2,875 | 2,490
Gross Unrealized Losses | (20) | (20)
Estimated Fair Value | 56,767 | 62,709
Other securities [Member] |  |
Summarizes amortized cost and estimated fair values of securities available for sale |  |
Amortized Cost | 10,843 | 7,222
Gross Unrealized Gains | 2,562 | 4,940
Gross Unrealized Losses | (14) |
Estimated Fair Value | $ 13,391 | $ 12,162

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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FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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