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Investments - Additional Information (Detail) (USD $)
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3 Months Ended |
9 Months Ended |
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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| Investment Securities [Line Items] |
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| Decline in fair value as a percentage of amortized cost |
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|
10.00% |
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| Percentage of concentration of mortgage loans by state |
5.00% |
|
5.00% |
|
5.00% |
| Time frame for initial default rates assumed to remain constant |
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24 months |
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| Number of fixed maturities and equity securities below cost |
41 |
|
41 |
|
85 |
| Allowance for potential future losses |
$ (2,442,000) |
|
$ (2,442,000) |
|
$ (2,849,000) |
| Percentage of invested assets in commercial mortgage loans |
15.00% |
|
15.00% |
|
17.00% |
| Average loan to value ratio for overall portfolio |
44.00% |
|
44.00% |
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46.00% |
| Loans refinanced |
4,500,000 |
0 |
13,100,000 |
9,700,000 |
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| Maximum period of commits to fund commercial mortgage loans |
120 days |
|
120 days |
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| Construction to permanent loan |
2,800,000 |
|
2,800,000 |
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| Construction to permanent loan disbursed |
$ 2,500,000 |
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$ 2,500,000 |
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Less than one year
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| Investment Securities [Line Items] |
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| Number of fixed maturities and equity securities below cost |
12 |
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12 |
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46 |
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One year or more and less than three years
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| Investment Securities [Line Items] |
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| Number of fixed maturities and equity securities below cost |
5 |
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5 |
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10 |
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Three years or more
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| Investment Securities [Line Items] |
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| Number of fixed maturities and equity securities below cost |
24 |
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24 |
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29 |
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Maximum
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| Investment Securities [Line Items] |
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| Percentage of concentration of mortgage loans by state |
80.00% |
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80.00% |
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Minimum
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| Investment Securities [Line Items] |
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| Percentage of concentration of mortgage loans by state |
10.00% |
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10.00% |
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