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Investments - Schedule of Available-for-sale Securities Reconciliation (Details) (USD $)
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6 Months Ended | |
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Jun. 30, 2014
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Dec. 31, 2013
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| Available for sale securities: | ||
| Amortized Cost | $ 446,986,000 | $ 441,562,000 |
| Gross Unrealized Gains | 6,132,000 | 4,358,000 |
| Gross Unrealized Losses | (5,069,000) | (11,333,000) |
| Fair Value | 448,049,000 | 434,587,000 |
| Percentage of shareholders' equity held by one issuer, maximum | 10.00% | 10.00% |
| Available-for-sale securities pledged as collateral, fair value | 244,600,000 | 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 | 92,289,000 | 93,218,000 |
| Gross Unrealized Gains | 806,000 | 700,000 |
| Gross Unrealized Losses | (124,000) | (388,000) |
| Fair Value | 92,971,000 | 93,530,000 |
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Obligations of states and political subdivisions
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| Available for sale securities: | ||
| Amortized Cost | 49,301,000 | 49,721,000 |
| Gross Unrealized Gains | 1,474,000 | 983,000 |
| Gross Unrealized Losses | (842,000) | (1,761,000) |
| Fair Value | 49,933,000 | 48,943,000 |
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Residential mortgage-backed securities
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| Available for sale securities: | ||
| Amortized Cost | 305,396,000 | 298,623,000 |
| Gross Unrealized Gains | 3,852,000 | 2,675,000 |
| Gross Unrealized Losses | (4,103,000) | (9,184,000) |
| Fair Value | $ 305,145,000 | $ 292,114,000 |