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Investments (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Security
Partnership
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Security
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Security
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value $ 472,364   $ 472,364    
Cost or amortized cost $ 473,218   473,218    
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]          
Applicable federal income taxes     (18,671)   $ (20,959)
Net unrealized gains - net of tax     $ 34,674   $ 38,924
Available-for-sale Securities Continuous Unrealized Loss Position [Abstract]          
Number of Securities, total | Security 327   327   569
Available-for-sale Securities Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair value, total $ 167,665   $ 167,665   $ 340,035
Available-for-sale Securities Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Gross unrealized loss, total (11,875)   (11,875)   (14,644)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
One year or less, Fair Value 116,328   116,328    
Excess of one year to five years, Fair Value 236,062   236,062    
Excess of five years to ten years, Fair Value 36,580   36,580    
Excess of ten years, Fair Value 1,967   1,967    
Contractual maturities, Fair Value 390,937   390,937    
Asset-backed securities, Fair Value 81,427   81,427    
Total, Fair Value 472,364   472,364    
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
One year or less, Cost or Amortized Cost Basis 116,599   116,599    
Excess of one year to five years, Cost or Amortized Cost Basis 235,283   235,283    
Excess of five years to ten years, Cost or Amortized Cost Basis 36,124   36,124    
Excess of ten years, Cost or Amortized Cost Basis 2,123   2,123    
Contractual maturities, Cost or Amortized Cost Basis 390,129   390,129    
Asset-backed securities, Cost or Amortized Cost Basis 83,089   83,089    
Cost or amortized cost 473,218   473,218    
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]          
Limited partnerships - net gain (loss) 977 $ (293) (1,202) $ 4,240  
Net realized gains (losses) on investments 280 (1,166) 9,292 2,577  
Available for Sale Securities Gain Loss Activity [Abstract]          
Realized net gains (losses) on the disposal of securities (1,142) (125) 7,167 (413)  
Mark-to-market adjustment (133) (104) (434) (392)  
Equity in gains (losses) of limited partnership investments - realized and unrealized 977 (293) (1,202) 4,240  
Write-downs based upon objective criteria (1,095) (893) (3,155) (1,107)  
Recovery of prior write-downs upon sale or disposal 1,673 249 6,916 249  
Net realized gains (losses) on investments 280 (1,166) 9,292 2,577  
Net unrealized gains on investments 155   719    
Net unrealized gains in limited partnership     5,780    
Undistributed earnings of limited partnership, net of taxes 25,680   25,680    
Committed funds for bridge loans 0   0    
Total investment in limited partnerships $ 44,400   44,400    
Number of partnerships investment | Partnership 2        
Investment assets other than limited partnership $ 62,600        
U.S. Government Obligations [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 109,031   109,031   103,245
Cost or amortized cost 108,414   108,414   103,448
Gross unrealized gains 618   618   56
Gross unrealized losses (1)   (1)   (259)
Net unrealized gains (losses) 617   617   (203)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 109,031   109,031   103,245
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 108,414   108,414   103,448
Residential Mortgage-backed Securities [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 5,797   5,797   4,776
Cost or amortized cost 5,652   5,652   4,668
Gross unrealized gains 236   236   162
Gross unrealized losses (91)   (91)   (54)
Net unrealized gains (losses) 145   145   108
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 5,797   5,797   4,776
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 5,652   5,652   4,668
Commercial Mortgage-backed Securities [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 30,227   30,227   30,595
Cost or amortized cost 30,523   30,523   30,977
Gross unrealized gains 634   634   247
Gross unrealized losses (930)   (930)   (629)
Net unrealized gains (losses) (296)   (296)   (382)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 30,227   30,227   30,595
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 30,523   30,523   30,977
States and Municipal Obligations [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 125,098   125,098   110,578
Cost or amortized cost 123,605   123,605   109,932
Gross unrealized gains 1,579   1,579   806
Gross unrealized losses (86)   (86)   (160)
Net unrealized gains (losses) 1,493   1,493   646
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 125,098   125,098   110,578
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 123,605   123,605   109,932
Corporate Securities [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 177,696   177,696   164,025
Cost or amortized cost 179,254   179,254   168,137
Gross unrealized gains 3,663   3,663   2,445
Gross unrealized losses (5,221)   (5,221)   (6,557)
Net unrealized gains (losses) (1,558)   (1,558)   (4,112)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 177,696   177,696   164,025
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 179,254   179,254   168,137
Foreign Government Obligations [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 24,515   24,515   23,965
Cost or amortized cost 25,770   25,770   25,416
Gross unrealized gains 411   411   404
Gross unrealized losses (1,666)   (1,666)   (1,855)
Net unrealized gains (losses) (1,255)   (1,255)   (1,451)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 24,515   24,515   23,965
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 25,770   25,770   25,416
Total Fixed Maturities [Member]          
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract]          
Fair value 472,364   472,364   437,184
Cost or amortized cost 473,218   473,218   442,578
Gross unrealized gains 7,141   7,141   4,120
Gross unrealized losses (7,995)   (7,995)   (9,514)
Net unrealized gains (losses) $ (854)   $ (854)   $ (5,394)
Available-for-sale Securities Continuous Unrealized Loss Position [Abstract]          
Number of Securities, 12 months or less | Security 213   213   328
Number of Securities, Greater than 12 months | Security 54   54   168
Number of Securities, total | Security 267   267   496
Available-for-sale Securities Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair value, 12 months or less $ 119,094   $ 119,094   $ 205,475
Fair value, Greater than 12 months 15,236   15,236   108,043
Fair value, total 134,330   134,330   313,518
Available-for-sale Securities Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Gross unrealized loss, 12 months or less (5,585)   (5,585)   (5,070)
Gross unrealized loss, Greater than 12 months (2,410)   (2,410)   (4,444)
Gross unrealized loss, total (7,995)   (7,995)   (9,514)
Available-for-sale Securities Debt Maturities Fair Value [Abstract]          
Total, Fair Value 472,364   472,364   437,184
Available-for-sale Securities Debt Maturities Amortized Cost Basis [Abstract]          
Cost or amortized cost 473,218   473,218   442,578
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]          
Gross gains 565 985 1,842 2,132  
Gross losses (1,140) (1,856) (4,036) (3,789)  
Net realized gains (losses) (575) (871) (2,194) (1,657)  
Financial Institutions [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 24,918   24,918   21,694
Cost or amortized cost 15,060   15,060   10,836
Gross unrealized gains 10,454   10,454   11,069
Gross unrealized losses (596)   (596)   (211)
Net unrealized gains (losses) 9,858   9,858   10,858
Industrial & Miscellaneous [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 112,826   112,826   123,804
Cost or amortized cost 68,485   68,485   69,385
Gross unrealized gains 47,625   47,625   59,338
Gross unrealized losses (3,284)   (3,284)   (4,919)
Net unrealized gains (losses) 44,341   44,341   54,419
Total Equity Securities [Member]          
Available-for-sale Equity Securities, Amortized Cost Basis [Abstract]          
Fair value 137,744   137,744   145,498
Cost or amortized cost 83,545   83,545   80,221
Gross unrealized gains 58,079   58,079   70,407
Gross unrealized losses (3,880)   (3,880)   (5,130)
Net unrealized gains (losses) $ 54,199   $ 54,199   $ 65,277
Available-for-sale Securities Continuous Unrealized Loss Position [Abstract]          
Number of Securities, 12 months or less | Security 60   60   73
Number of Securities, Greater than 12 months | Security 0   0   0
Number of Securities, total | Security 60   60   73
Available-for-sale Securities Continuous Unrealized Loss Position, Fair Value [Abstract]          
Fair value, 12 months or less $ 33,335   $ 33,335   $ 26,517
Fair value, Greater than 12 months 0   0   0
Fair value, total 33,335   33,335   26,517
Available-for-sale Securities Continuous Unrealized Loss Position, Aggregate Losses [Abstract]          
Gross unrealized loss, 12 months or less (3,880)   (3,880)   (5,130)
Gross unrealized loss, Greater than 12 months 0   0   0
Gross unrealized loss, total (3,880)   (3,880)   (5,130)
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]          
Gross gains 1,126 1,230 16,636 1,979  
Gross losses (1,248) (1,232) (3,948) (1,985)  
Net realized gains (losses) (122) $ (2) 12,688 $ (6)  
Total Available-for-sale Securities [Member]          
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]          
Fair value 610,108   610,108   582,682
Cost or amortized cost 556,763   556,763   522,799
Gross unrealized gains 65,220   65,220   74,527
Gross unrealized losses (11,875)   (11,875)   (14,644)
Net unrealized gains (losses) $ 53,345   $ 53,345   $ 59,883