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Investments - Schedule of Available-for-sale Securities Reconciliation (Details) (USD $)
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9 Months Ended | |
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Sep. 30, 2014
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Dec. 31, 2013
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| Available for sale securities: | ||
| Amortized Cost | $ 456,838,000 | $ 441,562,000 |
| Gross Unrealized Gains | 5,313,000 | 4,358,000 |
| Gross Unrealized Losses | (5,567,000) | (11,333,000) |
| Fair Value | 456,584,000 | 434,587,000 |
| Maximum percentage of shareholders' equity held by one issuer (percent) | 10.00% | 10.00% |
| Available-for-sale securities pledged as collateral, fair value | 255,900,000 | 270,100,000 |
| Mortgage-backed securities, weighted average life | 5 years | |
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Obligations of U.S. Government-sponsored enterprises
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| Available for sale securities: | ||
| Amortized Cost | 91,823,000 | 93,218,000 |
| Gross Unrealized Gains | 638,000 | 700,000 |
| Gross Unrealized Losses | (189,000) | (388,000) |
| Fair Value | 92,272,000 | 93,530,000 |
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Obligations of states and political subdivisions
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| Available for sale securities: | ||
| Amortized Cost | 49,064,000 | 49,721,000 |
| Gross Unrealized Gains | 1,576,000 | 983,000 |
| Gross Unrealized Losses | (699,000) | (1,761,000) |
| Fair Value | 49,941,000 | 48,943,000 |
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Agency mortgage-backed securities
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| Available for sale securities: | ||
| Amortized Cost | 315,951,000 | 298,623,000 |
| Gross Unrealized Gains | 3,099,000 | 2,675,000 |
| Gross Unrealized Losses | (4,679,000) | (9,184,000) |
| Fair Value | $ 314,371,000 | $ 292,114,000 |