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Investments - Schedule of Available-for-sale Securities Reconciliation (Details) (USD $)
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3 Months Ended | |
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Mar. 31, 2013
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Dec. 31, 2012
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| Available for sale securities: | ||
| Amortized Cost | $ 473,923,000 | $ 627,462,000 |
| Gross Unrealized Gains | 10,092,000 | 13,492,000 |
| Gross Unrealized Losses | (1,008,000) | (742,000) |
| Fair Value | 483,007,000 | 640,212,000 |
| Percentage of shareholders' equity held by one issuer, maximum | 10.00% | 10.00% |
| Available-for-sale securities pledged as collateral, fair value | 317,800,000 | 359,300,000 |
| Mortgage-backed securities, weighted average life | 4 years | |
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Obligations of U.S. Government sponsored enterprises
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| Available for sale securities: | ||
| Amortized Cost | 130,782,000 | 149,039,000 |
| Gross Unrealized Gains | 2,765,000 | 3,329,000 |
| Gross Unrealized Losses | 0 | 0 |
| Fair Value | 133,547,000 | 152,368,000 |
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Obligations of states and political subdivisions
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| Available for sale securities: | ||
| Amortized Cost | 50,402,000 | 51,202,000 |
| Gross Unrealized Gains | 2,113,000 | 2,279,000 |
| Gross Unrealized Losses | (608,000) | (478,000) |
| Fair Value | 51,907,000 | 53,003,000 |
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Residential mortgage-backed securities
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| Available for sale securities: | ||
| Amortized Cost | 292,739,000 | 427,221,000 |
| Gross Unrealized Gains | 5,214,000 | 7,884,000 |
| Gross Unrealized Losses | (400,000) | (264,000) |
| Fair Value | $ 297,553,000 | $ 434,841,000 |