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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2014 and 2013:
| Amortized |  | Unrealized |  | Unrealized |  | Fair Value
As of December 31, 2014 | Cost |  | Gains |  | Losses |  | (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 149,796,000 |  |  | $ | 2,637,000 |  |  | $ | (578,000 | ) |  | $ | 151,855,000 |
State and political subdivisions | 29,094,000 |  |  | 1,865,000 |  |  | (104,000 | ) |  | 30,855,000 |
Other equity securities | 2,490,000 |  |  | 65,000 |  |  | (4,000 | ) |  | 2,551,000 |
| $ | 181,380,000 |  |  | $ | 4,567,000 |  |  | $ | (686,000 | ) |  | $ | 185,261,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 92,341,000 |  |  | $ | 54,000 |  |  | $ | (2,066,000 | ) |  | $ | 90,329,000 |
Mortgage-backed securities | 57,003,000 |  |  | 1,830,000 |  |  | (116,000 | ) |  | 58,717,000 |
State and political subdivisions | 126,275,000 |  |  | 4,114,000 |  |  | (31,000 | ) |  | 130,358,000 |
Corporate securities | 300,000 |  |  | — |  |  | — |  |  | 300,000 |
| $ | 275,919,000 |  |  | $ | 5,998,000 |  |  | $ | (2,213,000 | ) |  | $ | 279,704,000 |
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, 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 |
Contractual Maturities of Investment Securities | The following table summarizes the contractual maturities of investment securities at December 31, 2014:
| 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 | $ | 2,309,000 |  |  | $ | 2,329,000 |  |  | $ | 1,693,000 |  |  | $ | 1,713,000 |
Due in 1 to 5 years | 15,200,000 |  |  | 15,499,000 |  |  | 8,467,000 |  |  | 8,702,000 |
Due in 5 to 10 years | 18,547,000 |  |  | 19,124,000 |  |  | 50,629,000 |  |  | 52,717,000 |
Due after 10 years | 142,834,000 |  |  | 145,758,000 |  |  | 215,130,000 |  |  | 216,572,000 |
Equity securities | 2,490,000 |  |  | 2,551,000 |  |  | — |  |  | — |
| $ | 181,380,000 |  |  | $ | 185,261,000 |  |  | $ | 275,919,000 |  |  | $ | 279,704,000 |
The following table summarizes the contractual maturities of investment securities at December 31, 2013:
| 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 | $ | 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 |
Schedule of Securities Gains and Losses | The following table shows securities gains and losses for 2014, 2013 and 2012:
| 2014 |  | 2013 |  | 2012
Proceeds from sales of securities | $ | 15,557,000 |  |  | $ | 10,563,000 |  |  | $ | 26,437,000 |
Gross realized gains | 1,155,000 |  |  | 1,087,000 |  |  | 2,257,000 |
Gross realized losses | — |  |  | — |  |  | (289,000 | )
Net gain | $ | 1,155,000 |  |  | $ | 1,087,000 |  |  | $ | 1,968,000 |
Related income taxes | $ | 404,000 |  |  | $ | 380,000 |  |  | $ | 689,000 |
Schedule of Temporary Impairment Losses | Information regarding securities temporarily impaired as of December 31, 2014 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
As of December 31, 2014 | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
U.S. Government-sponsored agencies | $ | — |  |  | $ | — |  |  | $ | 79,444,000 |  |  | $ | (2,066,000 | ) |  | $ | 79,444,000 |  |  | $ | (2,066,000 | )
Mortgage-backed securities | 13,878,000 |  |  | (40,000 | ) |  | 29,182,000 |  |  | (654,000 | ) |  | 43,060,000 |  |  | (694,000 | )
State and political subdivisions | 3,352,000 |  |  | (31,000 | ) |  | 3,017,000 |  |  | (104,000 | ) |  | 6,369,000 |  |  | (135,000 | )
Other equity securities | 68,000 |  |  | (3,000 | ) |  | 51,000 |  |  | (1,000 | ) |  | 119,000 |  |  | (4,000 | )
| $ | 17,298,000 |  |  | $ | (74,000 | ) |  | $ | 111,694,000 |  |  | $ | (2,825,000 | ) |  | $ | 128,992,000 |  |  | $ | (2,899,000 | )
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 | )

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