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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available For Sale, Held-to-Maturity, and Restricted Equity Securities | The following tables summarize the amortized cost and estimated fair value of investment securities at December 31, 2013 and 2012:
| Amortized |  | Unrealized |  | Unrealized |  | Fair Value
As of December 31, 2013 | Cost |  | Gains |  | Losses |  | (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 180,109,000 |  |  | $ | 1,392,000 |  |  | $ | (3,772,000 | ) |  | $ | 177,729,000 |
State and political subdivisions | 134,188,000 |  |  | 1,458,000 |  |  | (9,331,000 | ) |  | 126,315,000 |
Other equity securities | 1,666,000 |  |  | 116,000 |  |  | (2,000 | ) |  | 1,780,000 |
| $ | 315,963,000 |  |  | $ | 2,966,000 |  |  | $ | (13,105,000 | ) |  | $ | 305,824,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 92,280,000 |  |  | $ | 1,000 |  |  | $ | (12,757,000 | ) |  | $ | 79,524,000 |
Mortgage-backed securities | 35,712,000 |  |  | 1,440,000 |  |  | (1,336,000 | ) |  | 35,816,000 |
State and political subdivisions | 40,985,000 |  |  | 1,823,000 |  |  | (112,000 | ) |  | 42,696,000 |
Corporate securities | 300,000 |  |  | — |  |  | — |  |  | 300,000 |
| $ | 169,277,000 |  |  | $ | 3,264,000 |  |  | $ | (14,205,000 | ) |  | $ | 158,336,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 12,875,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,875,000 |
Federal Reserve Bank Stock | 1,037,000 |  |  | — |  |  | — |  |  | 1,037,000 |
| $ | 13,912,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,912,000 |
| Amortized |  | Unrealized |  | Unrealized |  | Fair Value
As of December 31, 2012 | Cost |  | Gains |  | Losses |  | (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 164,752,000 |  |  | $ | 4,636,000 |  |  | $ | (295,000 | ) |  | $ | 169,093,000 |
State and political subdivisions | 113,069,000 |  |  | 8,074,000 |  |  | (199,000 | ) |  | 120,944,000 |
Other equity securities | 1,578,000 |  |  | 43,000 |  |  | (44,000 | ) |  | 1,577,000 |
| $ | 279,399,000 |  |  | $ | 12,753,000 |  |  | $ | (538,000 | ) |  | $ | 291,614,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 60,919,000 |  |  | $ | 242,000 |  |  | $ | (182,000 | ) |  | $ | 60,979,000 |
Mortgage-backed securities | 39,193,000 |  |  | 2,850,000 |  |  | (19,000 | ) |  | 42,024,000 |
State and political subdivisions | 42,908,000 |  |  | 4,036,000 |  |  | — |  |  | 46,944,000 |
Corporate securities | 300,000 |  |  | — |  |  | — |  |  | 300,000 |
| $ | 143,320,000 |  |  | $ | 7,128,000 |  |  | $ | (201,000 | ) |  | $ | 150,247,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 13,412,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,412,000 |
Federal Reserve Bank Stock | 1,036,000 |  |  | — |  |  | — |  |  | 1,036,000 |
| $ | 14,448,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,448,000 |
Contractual Maturities of Investment Securities | The following table summarizes the contractual maturities of investment securities at December 31, 2013:
| Securities available for sale |  | Securities to be held to maturity
| Amortized Cost |  | Fair Value (Estimated) |  | Amortized Cost |  | Fair Value (Estimated)
Due in 1 year or less | $ | 717,000 |  |  | $ | 721,000 |  |  | $ | 268,000 |  |  | $ | 273,000 |
Due in 1 to 5 years | 20,547,000 |  |  | 20,636,000 |  |  | 6,420,000 |  |  | 6,790,000 |
Due in 5 to 10 years | 16,114,000 |  |  | 16,267,000 |  |  | 33,442,000 |  |  | 33,828,000 |
Due after 10 years | 276,919,000 |  |  | 266,420,000 |  |  | 129,147,000 |  |  | 117,445,000 |
Equity securities | 1,666,000 |  |  | 1,780,000 |  |  | — |  |  | — |
| $ | 315,963,000 |  |  | $ | 305,824,000 |  |  | $ | 169,277,000 |  |  | $ | 158,336,000 |
The following table summarizes the contractual maturities of investment securities at December 31, 2012:
| Securities available for sale |  | Securities to be held to maturity
In thousands of dollars | Amortized Cost |  | Fair Value (Estimated) |  | Amortized Cost |  | Fair Value (Estimated)
Due in 1 year or less | $ | 18,761,000 |  |  | $ | 18,926,000 |  |  | $ | 3,754,000 |  |  | $ | 3,785,000 |
Due in 1 to 5 years | 27,243,000 |  |  | 27,816,000 |  |  | 11,950,000 |  |  | 12,701,000 |
Due in 5 to 10 years | 16,686,000 |  |  | 17,666,000 |  |  | 27,461,000 |  |  | 29,986,000 |
Due after 10 years | 215,131,000 |  |  | 225,629,000 |  |  | 100,155,000 |  |  | 103,775,000 |
Equity securities | 1,578,000 |  |  | 1,577,000 |  |  | — |  |  | — |
| $ | 279,399,000 |  |  | $ | 291,614,000 |  |  | $ | 143,320,000 |  |  | $ | 150,247,000 |
Schedule of Securities Gains and Losses | The following table shows securities gains and losses for 2013, 2012 and 2011:
| 2013 |  | 2012 |  | 2011
Proceeds from sales of securities | $ | 10,563,000 |  |  | $ | 26,437,000 |  |  | $ | 140,417,000 |
Gross realized gains | 1,087,000 |  |  | 2,257,000 |  |  | 4,020,000 |
Gross realized losses | — |  |  | (289,000 | ) |  | (727,000 | )
Net gain | $ | 1,087,000 |  |  | $ | 1,968,000 |  |  | $ | 3,293,000 |
Related income taxes | $ | 380,000 |  |  | $ | 689,000 |  |  | $ | 1,153,000 |
Schedule of Temporary Impairment Losses | Information regarding securities temporarily impaired as of December 31, 2013 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
As of December 31, 2013 | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
U.S. Government-sponsored agencies | $ | 78,724,000 |  |  | $ | (12,757,000 | ) |  | $ | — |  |  | $ | — |  |  | $ | 78,724,000 |  |  | $ | (12,757,000 | )
Mortgage-backed securities | 96,263,000 |  |  | (4,977,000 | ) |  | 5,451,000 |  |  | (131,000 | ) |  | 101,714,000 |  |  | (5,108,000 | )
State and political subdivisions | 69,406,000 |  |  | (7,895,000 | ) |  | 7,150,000 |  |  | (1,548,000 | ) |  | 76,556,000 |  |  | (9,443,000 | )
Other equity securities | — |  |  | — |  |  | 50,000 |  |  | (2,000 | ) |  | 50,000 |  |  | (2,000 | )
| $ | 244,393,000 |  |  | $ | (25,629,000 | ) |  | $ | 12,651,000 |  |  | $ | (1,681,000 | ) |  | $ | 257,044,000 |  |  | $ | (27,310,000 | )
Information regarding securities temporarily impaired as of December 31, 2012 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
As of December 31, 2012 | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
U.S. Government-sponsored agencies | $ | 15,817,000 |  |  | $ | (182,000 | ) |  | $ | — |  |  | $ | — |  |  | $ | 15,817,000 |  |  | $ | (182,000 | )
Mortgage-backed securities | 9,982,000 |  |  | (231,000 | ) |  | 2,534,000 |  |  | (83,000 | ) |  | 12,516,000 |  |  | (314,000 | )
State and political subdivisions | 8,621,000 |  |  | (199,000 | ) |  | — |  |  | — |  |  | 8,621,000 |  |  | (199,000 | )
Other equity securities | — |  |  | — |  |  | 222,000 |  |  | (44,000 | ) |  | 222,000 |  |  | (44,000 | )
| $ | 34,420,000 |  |  | $ | (612,000 | ) |  | $ | 2,756,000 |  |  | $ | (127,000 | ) |  | $ | 37,176,000 |  |  | $ | (739,000 | )

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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