Investments (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 |
Security | Security | Security |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | $1,539,567,000 | ' | $1,539,567,000 | ' | $1,551,100,000 |
Gross Unrealized Gains | 59,934,000 | ' | 59,934,000 | ' | 60,261,000 |
Gross Unrealized Losses | -12,469,000 | ' | -12,469,000 | ' | -38,333,000 |
Gross Unrealized Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Estimated Fair Value | 1,587,032,000 | ' | 1,587,032,000 | ' | 1,573,028,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | 59,934,000 | ' | 59,934,000 | ' | 60,261,000 |
Unrealized losses | -12,469,000 | ' | -12,469,000 | ' | -38,333,000 |
Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Net unrealized gains | ' | ' | 47,465,000 | ' | 21,928,000 |
Deferred federal income tax expense | ' | ' | -16,612,000 | ' | -7,675,000 |
Net unrealized gains on investments, net of deferred federal income taxes | ' | ' | 30,853,000 | ' | 14,253,000 |
Realized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Net realized gains (losses) | 2,798,000 | 703,000 | 9,159,000 | 3,898,000 | ' |
Net realized gains | 2,973,000 | 675,000 | 9,252,000 | 3,860,000 | ' |
OTTI included in realized losses on securities above | 0 | 0 | 0 | 0 | ' |
Proceeds from sale of debt and equity securities available for sale | 31,800,000 | 12,800,000 | 62,900,000 | 88,900,000 | ' |
Available for Sale, Amortized Cost [Abstract] | ' | ' | ' | ' | ' |
Due in one year or less | 41,384,000 | ' | 41,384,000 | ' | ' |
Due after one year through five years | 535,460,000 | ' | 535,460,000 | ' | ' |
Due after five years through ten years | 601,630,000 | ' | 601,630,000 | ' | ' |
Due after ten years | 121,064,000 | ' | 121,064,000 | ' | ' |
Mortgage-backed securities, collateralized obligations and asset-backed securities | 145,871,000 | ' | 145,871,000 | ' | ' |
Amortized Cost | 1,445,409,000 | ' | 1,445,409,000 | ' | 1,455,754,000 |
Available for Sale, Estimated Fair Value [Abstract] | ' | ' | ' | ' | ' |
Due in one year or less | 41,962,000 | ' | 41,962,000 | ' | ' |
Due after one year through five years | 558,383,000 | ' | 558,383,000 | ' | ' |
Due after five years through ten years | 611,530,000 | ' | 611,530,000 | ' | ' |
Due after ten years | 122,469,000 | ' | 122,469,000 | ' | ' |
Mortgage-backed securities, collateralized obligations and asset-backed securities | 145,818,000 | ' | 145,818,000 | ' | ' |
Estimated Fair Value | 1,480,162,000 | ' | 1,480,162,000 | ' | ' |
Net Investment Income Earned From [Abstract] | ' | ' | ' | ' | ' |
Total gross investment income | 11,497,000 | 12,096,000 | 34,804,000 | 35,744,000 | ' |
Less investment expenses | 410,000 | 401,000 | 1,247,000 | 1,141,000 | ' |
Net investment income | 11,087,000 | 11,695,000 | 33,557,000 | 34,603,000 | ' |
OTTI loss | 0 | 0 | 0 | 0 | ' |
Non-credit related OTTI loss | 0 | 0 | 0 | 0 | ' |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | 154 | ' | 154 | ' | 266 |
Number of Issue in an unrealized loss position, greater than 12 months | 80 | ' | 80 | ' | 26 |
Total | 234 | ' | 234 | ' | 292 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | 351,117,000 | ' | 351,117,000 | ' | 656,569,000 |
Greater than 12 months | 251,370,000 | ' | 251,370,000 | ' | 69,543,000 |
Total | 602,487,000 | ' | 602,487,000 | ' | 726,112,000 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | -6,207,000 | ' | -32,203,000 |
Greater than 12 months | ' | ' | -6,262,000 | ' | -6,130,000 |
Total | ' | ' | -12,469,000 | ' | -38,333,000 |
Debt securities [Member] | ' | ' | ' | ' | ' |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | 1,445,409,000 | ' | 1,445,409,000 | ' | 1,455,754,000 |
Gross Unrealized Gains | 45,901,000 | ' | 45,901,000 | ' | 45,181,000 |
Gross Unrealized Losses | -11,148,000 | ' | -11,148,000 | ' | -37,889,000 |
Gross Unrealized Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Estimated Fair Value | 1,480,162,000 | ' | 1,480,162,000 | ' | 1,463,046,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | 45,901,000 | ' | 45,901,000 | ' | 45,181,000 |
Unrealized losses | -11,148,000 | ' | -11,148,000 | ' | -37,889,000 |
Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Realized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Gross realized gains | 857,000 | 87,000 | 1,193,000 | 1,617,000 | ' |
Gross realized losses | -383,000 | -40,000 | -383,000 | -211,000 | ' |
Net realized gains | 474,000 | 47,000 | 810,000 | 1,406,000 | ' |
Net Investment Income Earned From [Abstract] | ' | ' | ' | ' | ' |
Total gross investment income | 10,515,000 | 10,888,000 | 31,746,000 | 32,593,000 | ' |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | 132 | ' | 132 | ' | 251 |
Number of Issue in an unrealized loss position, greater than 12 months | 77 | ' | 77 | ' | 26 |
Total | 209 | ' | 209 | ' | 277 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | 332,090,000 | ' | 332,090,000 | ' | 644,457,000 |
Greater than 12 months | 249,980,000 | ' | 249,980,000 | ' | 69,543,000 |
Total | 582,070,000 | ' | 582,070,000 | ' | 714,000,000 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | -4,984,000 | ' | -31,759,000 |
Greater than 12 months | ' | ' | -6,164,000 | ' | -6,130,000 |
Total | ' | ' | -11,148,000 | ' | -37,889,000 |
Debt securities [Member] | U.S. Government and agencies [Member] | ' | ' | ' | ' | ' |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | 24,442,000 | ' | 24,442,000 | ' | 24,985,000 |
Gross Unrealized Gains | 503,000 | ' | 503,000 | ' | 572,000 |
Gross Unrealized Losses | -118,000 | ' | -118,000 | ' | -188,000 |
Gross Unrealized Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Estimated Fair Value | 24,827,000 | ' | 24,827,000 | ' | 25,369,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | 503,000 | ' | 503,000 | ' | 572,000 |
Unrealized losses | -118,000 | ' | -118,000 | ' | -188,000 |
Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | 0 | ' | 0 | ' | 5 |
Number of Issue in an unrealized loss position, greater than 12 months | 3 | ' | 3 | ' | 1 |
Total | 3 | ' | 3 | ' | 6 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | 0 | ' | 0 | ' | 6,181,000 |
Greater than 12 months | 3,399,000 | ' | 3,399,000 | ' | 903,000 |
Total | 3,399,000 | ' | 3,399,000 | ' | 7,084,000 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | 0 | ' | -91,000 |
Greater than 12 months | ' | ' | -118,000 | ' | -97,000 |
Total | ' | ' | -118,000 | ' | -188,000 |
Debt securities [Member] | Obligations of states and political subs [Member] | ' | ' | ' | ' | ' |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | 703,170,000 | ' | 703,170,000 | ' | 730,004,000 |
Gross Unrealized Gains | 27,283,000 | ' | 27,283,000 | ' | 25,509,000 |
Gross Unrealized Losses | -3,838,000 | ' | -3,838,000 | ' | -20,121,000 |
Gross Unrealized Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Estimated Fair Value | 726,615,000 | ' | 726,615,000 | ' | 735,392,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | 27,283,000 | ' | 27,283,000 | ' | 25,509,000 |
Unrealized losses | -3,838,000 | ' | -3,838,000 | ' | -20,121,000 |
Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | 29 | ' | 29 | ' | 103 |
Number of Issue in an unrealized loss position, greater than 12 months | 40 | ' | 40 | ' | 16 |
Total | 69 | ' | 69 | ' | 119 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | 96,714,000 | ' | 96,714,000 | ' | 285,264,000 |
Greater than 12 months | 132,304,000 | ' | 132,304,000 | ' | 43,811,000 |
Total | 229,018,000 | ' | 229,018,000 | ' | 329,075,000 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | -1,407,000 | ' | -16,218,000 |
Greater than 12 months | ' | ' | -2,431,000 | ' | -3,903,000 |
Total | ' | ' | -3,838,000 | ' | -20,121,000 |
Debt securities [Member] | Corporate securities [Member] | ' | ' | ' | ' | ' |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | 571,926,000 | ' | 571,926,000 | ' | 534,913,000 |
Gross Unrealized Gains | 15,343,000 | ' | 15,343,000 | ' | 15,529,000 |
Gross Unrealized Losses | -4,367,000 | ' | -4,367,000 | ' | -11,935,000 |
Gross Unrealized Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Estimated Fair Value | 582,902,000 | ' | 582,902,000 | ' | 538,507,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | 15,343,000 | ' | 15,343,000 | ' | 15,529,000 |
Unrealized losses | -4,367,000 | ' | -4,367,000 | ' | -11,935,000 |
Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | 93 | ' | 93 | ' | 121 |
Number of Issue in an unrealized loss position, greater than 12 months | 23 | ' | 23 | ' | 8 |
Total | 116 | ' | 116 | ' | 129 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | 197,177,000 | ' | 197,177,000 | ' | 259,581,000 |
Greater than 12 months | 60,425,000 | ' | 60,425,000 | ' | 16,734,000 |
Total | 257,602,000 | ' | 257,602,000 | ' | 276,315,000 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | -2,592,000 | ' | -10,663,000 |
Greater than 12 months | ' | ' | -1,775,000 | ' | -1,272,000 |
Total | ' | ' | -4,367,000 | ' | -11,935,000 |
Debt securities [Member] | Residential mortgage-backed securities [Member] | ' | ' | ' | ' | ' |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | 104,563,000 | ' | 104,563,000 | ' | 118,930,000 |
Gross Unrealized Gains | 1,887,000 | ' | 1,887,000 | ' | 2,191,000 |
Gross Unrealized Losses | -2,384,000 | ' | -2,384,000 | ' | -4,737,000 |
Gross Unrealized Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Estimated Fair Value | 104,066,000 | ' | 104,066,000 | ' | 116,384,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | 1,887,000 | ' | 1,887,000 | ' | 2,191,000 |
Unrealized losses | -2,384,000 | ' | -2,384,000 | ' | -4,737,000 |
Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | 4 | ' | 4 | ' | 13 |
Number of Issue in an unrealized loss position, greater than 12 months | 9 | ' | 9 | ' | 1 |
Total | 13 | ' | 13 | ' | 14 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | 28,700,000 | ' | 28,700,000 | ' | 72,458,000 |
Greater than 12 months | 46,060,000 | ' | 46,060,000 | ' | 8,095,000 |
Total | 74,760,000 | ' | 74,760,000 | ' | 80,553,000 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | -814,000 | ' | -3,879,000 |
Greater than 12 months | ' | ' | -1,570,000 | ' | -858,000 |
Total | ' | ' | -2,384,000 | ' | -4,737,000 |
Debt securities [Member] | Commercial mortgage-backed securities [Member] | ' | ' | ' | ' | ' |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | 21,592,000 | ' | 21,592,000 | ' | 26,719,000 |
Gross Unrealized Gains | 318,000 | ' | 318,000 | ' | 617,000 |
Gross Unrealized Losses | -429,000 | ' | -429,000 | ' | -868,000 |
Gross Unrealized Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Estimated Fair Value | 21,481,000 | ' | 21,481,000 | ' | 26,468,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | 318,000 | ' | 318,000 | ' | 617,000 |
Unrealized losses | -429,000 | ' | -429,000 | ' | -868,000 |
Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | 3 | ' | 3 | ' | 5 |
Number of Issue in an unrealized loss position, greater than 12 months | 2 | ' | 2 | ' | 0 |
Total | 5 | ' | 5 | ' | 5 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | 5,064,000 | ' | 5,064,000 | ' | 12,451,000 |
Greater than 12 months | 7,792,000 | ' | 7,792,000 | ' | 0 |
Total | 12,856,000 | ' | 12,856,000 | ' | 12,451,000 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | -159,000 | ' | -868,000 |
Greater than 12 months | ' | ' | -270,000 | ' | 0 |
Total | ' | ' | -429,000 | ' | -868,000 |
Debt securities [Member] | Other asset-backed securities [Member] | ' | ' | ' | ' | ' |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | 19,716,000 | ' | 19,716,000 | ' | 20,203,000 |
Gross Unrealized Gains | 567,000 | ' | 567,000 | ' | 763,000 |
Gross Unrealized Losses | -12,000 | ' | -12,000 | ' | -40,000 |
Gross Unrealized Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Estimated Fair Value | 20,271,000 | ' | 20,271,000 | ' | 20,926,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | 567,000 | ' | 567,000 | ' | 763,000 |
Unrealized losses | -12,000 | ' | -12,000 | ' | -40,000 |
Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | 3 | ' | 3 | ' | 4 |
Number of Issue in an unrealized loss position, greater than 12 months | 0 | ' | 0 | ' | 0 |
Total | 3 | ' | 3 | ' | 4 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | 4,435,000 | ' | 4,435,000 | ' | 8,522,000 |
Greater than 12 months | 0 | ' | 0 | ' | 0 |
Total | 4,435,000 | ' | 4,435,000 | ' | 8,522,000 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | -12,000 | ' | -40,000 |
Greater than 12 months | ' | ' | 0 | ' | 0 |
Total | ' | ' | -12,000 | ' | -40,000 |
Equity securities [Member] | ' | ' | ' | ' | ' |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | 94,158,000 | ' | 94,158,000 | ' | 95,346,000 |
Gross Unrealized Gains | 14,033,000 | ' | 14,033,000 | ' | 15,080,000 |
Gross Unrealized Losses | -1,321,000 | ' | -1,321,000 | ' | -444,000 |
Gross Unrealized Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Estimated Fair Value | 106,870,000 | ' | 106,870,000 | ' | 109,982,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | 14,033,000 | ' | 14,033,000 | ' | 15,080,000 |
Unrealized losses | -1,321,000 | ' | -1,321,000 | ' | -444,000 |
Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Realized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Gross realized gains | 2,328,000 | 656,000 | 8,357,000 | 2,502,000 | ' |
Gross realized losses | -4,000 | 0 | -8,000 | -10,000 | ' |
Net realized gains | 2,324,000 | 656,000 | 8,349,000 | 2,492,000 | ' |
Net Investment Income Earned From [Abstract] | ' | ' | ' | ' | ' |
Total gross investment income | 811,000 | 1,043,000 | 2,658,000 | 2,593,000 | ' |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | 22 | ' | 22 | ' | 15 |
Number of Issue in an unrealized loss position, greater than 12 months | 3 | ' | 3 | ' | 0 |
Total | 25 | ' | 25 | ' | 15 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | 19,027,000 | ' | 19,027,000 | ' | 12,112,000 |
Greater than 12 months | 1,390,000 | ' | 1,390,000 | ' | 0 |
Total | 20,417,000 | ' | 20,417,000 | ' | 12,112,000 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | -1,223,000 | ' | -444,000 |
Greater than 12 months | ' | ' | -98,000 | ' | 0 |
Total | ' | ' | -1,321,000 | ' | -444,000 |
Equity securities [Member] | Perpetual preferred stock [Member] | ' | ' | ' | ' | ' |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | ' | ' | ' | ' | 71,000 |
Gross Unrealized Gains | ' | ' | ' | ' | 147,000 |
Gross Unrealized Losses | ' | ' | ' | ' | 0 |
Gross Unrealized Non-Credit OTTI | ' | ' | ' | ' | 0 |
Estimated Fair Value | ' | ' | ' | ' | 218,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | ' | ' | ' | ' | 147,000 |
Unrealized losses | ' | ' | ' | ' | 0 |
Non-Credit OTTI | ' | ' | ' | ' | 0 |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | ' | ' | ' | ' | 0 |
Number of Issue in an unrealized loss position, greater than 12 months | ' | ' | ' | ' | 0 |
Total | ' | ' | ' | ' | 0 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | ' | ' | 0 |
Greater than 12 months | ' | ' | ' | ' | 0 |
Total | ' | ' | ' | ' | 0 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | ' | ' | 0 |
Greater than 12 months | ' | ' | ' | ' | 0 |
Total | ' | ' | ' | ' | 0 |
Equity securities [Member] | Common Stock [Member] | ' | ' | ' | ' | ' |
Available for sale securities [Abstract] | ' | ' | ' | ' | ' |
Cost or Amortized Cost | 94,158,000 | ' | 94,158,000 | ' | 95,275,000 |
Gross Unrealized Gains | 14,033,000 | ' | 14,033,000 | ' | 14,933,000 |
Gross Unrealized Losses | -1,321,000 | ' | -1,321,000 | ' | -444,000 |
Gross Unrealized Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Estimated Fair Value | 106,870,000 | ' | 106,870,000 | ' | 109,764,000 |
Unrealized gain (loss) on investments [Abstract] | ' | ' | ' | ' | ' |
Unrealized gains | 14,033,000 | ' | 14,033,000 | ' | 14,933,000 |
Unrealized losses | -1,321,000 | ' | -1,321,000 | ' | -444,000 |
Non-Credit OTTI | 0 | ' | 0 | ' | 0 |
Investments in unrealized loss position, classified by continuous loss time period [Abstract] | ' | ' | ' | ' | ' |
Number of issues in an unrealized loss position, less than twelve months | 22 | ' | 22 | ' | 15 |
Number of Issue in an unrealized loss position, greater than 12 months | 3 | ' | 3 | ' | 0 |
Total | 25 | ' | 25 | ' | 15 |
Fair Value of Investments with Unrealized Losses [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | 19,027,000 | ' | 19,027,000 | ' | 12,112,000 |
Greater than 12 months | 1,390,000 | ' | 1,390,000 | ' | ' |
Total | 20,417,000 | ' | 20,417,000 | ' | 12,112,000 |
Gross Unrealized Losses and Non-Credit OTTI [Abstract] | ' | ' | ' | ' | ' |
Less than 12 months | ' | ' | -1,223,000 | ' | -444,000 |
Greater than 12 months | ' | ' | -98,000 | ' | ' |
Total | ' | ' | -1,321,000 | ' | -444,000 |
Cash and cash equivalents [Member] | ' | ' | ' | ' | ' |
Net Investment Income Earned From [Abstract] | ' | ' | ' | ' | ' |
Total gross investment income | $171,000 | $165,000 | $400,000 | $558,000 | ' |