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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments [Abstract]  
Summary of available for sale securities
The following is a summary of available for sale securities at December 31:
     
           
          
Net
 
    
Cost or
  
Gross
  
Gross
  
Unrealized
 
  
Fair
  
Amortized
  
Unrealized
  
Unrealized
  
Gains
 
  
Value
  
Cost
  
Gains
  
Losses
  
(Losses)
 
2015:
          
Fixed maturities:
          
   U.S. government obligations
 
$
103,245
  
$
103,448
  
$
56
  
$
(259
)
 
$
(203
)
   Residential mortgage-backed securities
  
4,776
   
4,668
   
162
   
(54
)
  
108
 
   Commercial mortgage-backed securities
  
30,595
   
30,977
   
247
   
(629
)
  
(382
)
   State and municipal obligations
  
110,578
   
109,932
   
806
   
(160
)
  
646
 
   Corporate securities
  
164,025
   
168,137
   
2,445
   
(6,557
)
  
(4,112
)
   Foreign government obligations
  
23,965
   
25,416
   
404
   
(1,855
)
  
(1,451
)
      Total fixed maturities
  
437,184
   
442,578
   
4,120
   
(9,514
)
  
(5,394
)
Equity securities:
                    
   Financial institutions
  
21,694
   
10,836
   
11,069
   
(211
)
  
10,858
 
   Industrial & miscellaneous
  
123,804
   
69,385
   
59,338
   
(4,919
)
  
54,419
 
      Total equity securities
  
145,498
   
80,221
   
70,407
   
(5,130
)
  
65,277
 
Total
 
$
582,682
  
$
522,799
  
$
74,527
  
$
(14,644
)
  
59,883
 
                     
              
Applicable federal income taxes
   
(20,959
)
                     
              
Net unrealized gains - net of tax
  
$
38,924
 
                     
2014:
                    
Fixed maturities:
                    
   U.S. government obligations
 
$
101,094
  
$
101,058
  
$
108
  
$
(72
)
 
$
36
 
   Residential mortgage-backed securities
  
6,066
   
5,830
   
273
   
(37
)
  
236
 
   Commercial mortgage-backed securities
  
36,440
   
36,210
   
630
   
(400
)
  
230
 
   State and municipal obligations
  
113,777
   
113,133
   
784
   
(140
)
  
644
 
   Corporate securities
  
166,966
   
170,822
   
2,005
   
(5,861
)
  
(3,856
)
   Foreign government obligations
  
27,466
   
28,332
   
114
   
(980
)
  
(866
)
      Total fixed maturities
  
451,809
   
455,385
   
3,914
   
(7,490
)
  
(3,576
)
Equity securities:
                    
   Financial institutions
  
25,343
   
10,100
   
15,303
   
(60
)
  
15,243
 
   Industrial & miscellaneous
  
136,764
   
68,678
   
70,260
   
(2,174
)
  
68,086
 
      Total equity securities
  
162,107
   
78,778
   
85,563
   
(2,234
)
  
83,329
 
Total
 
$
613,916
  
$
534,163
  
$
89,477
  
$
(9,724
)
  
79,753
 
                     
              
Applicable federal income taxes
   
(27,913
)
                     
              
Net unrealized gains - net of tax
  
$
51,840
 
Fixed maturity and equity security investments in unrealized loss position
The following table summarizes, for fixed maturity and equity security investments in an unrealized loss position at December 31, the aggregate fair value and gross unrealized loss categorized by the duration those securities have been continuously in an unrealized loss position.
 
  
2015
  
2014
 
  
Number of Securities
  
Fair Value
  
Gross Unrealized Loss
  
Number of Securities
  
Fair Value
  
Gross Unrealized Loss
 
Fixed maturity securities:
            
12 months or less
  
328
  
$
205,475
  
$
(5,070
)
  
591
  
$
176,756
  
$
(6,083
)
Greater than 12 months
  
168
   
108,043
   
(4,444
)
  
140
   
27,667
   
(1,407
)
Total fixed maturities
  
496
   
313,518
   
(9,514
)
  
731
   
204,423
   
(7,490
)
Equity securities:
                        
12 months or less
  
73
   
26,517
   
(5,130
)
  
33
   
13,538
   
(2,170
)
Greater than 12 months
  
-
   
-
   
-
   
3
   
686
   
(64
)
Total equity securities
  
73
   
26,517
   
(5,130
)
  
36
   
14,224
   
(2,234
)
Total
  
569
  
$
340,035
  
$
(14,644
)
  
767
  
$
218,647
  
$
(9,724
)
Fair value and cost or amortized cost of fixed maturity investments by contractual maturity
The fair value and the cost or amortized cost of fixed maturity investments at December 31, 2015, by contractual maturity, is shown below.  Actual maturities may differ from contractual maturities because borrowers have, in some cases, the right to call or prepay obligations with or without call or prepayment penalties.  Pre-refunded municipal bonds are classified based on their pre-refunded call dates.

  
Fair Value
  
Cost or Amortized Cost
 
         
One year or less
 
$
74,187
   
17.0
%
 
$
75,854
   
17.1
%
Excess of one year to five years
  
242,713
   
55.5
   
244,033
   
55.1
 
Excess of five years to ten years
  
36,452
   
8.3
   
37,269
   
8.4
 
Excess of ten years
  
3,218
   
0.8
   
2,901
   
0.7
 
   Total maturities
  
356,570
   
81.6
   
360,057
   
81.3
 
Asset-backed securities
  
80,614
   
18.4
   
82,521
   
18.7
 
  
$
437,184
   
100.0
%
 
$
442,578
   
100.0
%
Major categories of investment income
Major categories of investment income for the years ended December 31 are summarized as follows:
 
  
2015
  
2014
  
2013
 
Interest on fixed maturities
 
$
11,663
  
$
8,806
  
$
9,023
 
Dividends on equity securities
  
3,445
   
2,693
   
2,166
 
Money market funds, Short-term and other
  
32
   
37
   
49
 
   
15,140
   
11,536
   
11,238
 
Investment expenses
  
(2,642
)
  
(2,481
)
  
(2,468
)
Net investment income
 
$
12,498
  
$
9,055
  
$
8,770
 
Realized gains (losses) on investments
Gains and losses on investments, including equity method earnings from limited partnerships, for the years ended December 31 are summarized below:
  
2015
  
2014
  
2013
 
Fixed maturities:
      
   Gross gains
 
$
6,633
  
$
6,480
  
$
7,235
 
   Gross losses
  
(13,634
)
  
(4,596
)
  
(4,371
)
      Net gains (losses)
  
(7,001
)
  
1,884
   
2,864
 
             
Equity securities:
            
   Gross gains
  
21,070
   
7,467
   
15,374
 
   Gross losses
  
(13,643
)
  
(1,529
)
  
(2,718
)
      Net gains
  
7,427
   
5,938
   
12,656
 
             
Limited partnerships - net gain (loss)
  
(1,687
)
  
7,108
   
7,995
 
             
             
      Total net gains (losses)
 
$
(1,261
)
 
$
14,930
  
$
23,515
 
Adjustments for other-than-temporary impairments
Gain and loss activity for fixed maturity and equity security investments, as shown in the previous table, include adjustments for other-than-temporary impairment for the years ended December 31 summarized as follows:
  
2015
  
2014
  
2013
 
  
  
  
 
Cumulative charges to income at beginning of year
 
$
7,168
  
$
6,770
  
$
7,773
 
             
Writedowns based on objective and subjective criteria
  
7,700
   
689
   
742
 
Recovery of prior writedowns upon sale or disposal
  
(4,355
)
  
(291
)
  
(1,745
)
Net pre-tax realized gain (loss)
  
(3,345
)
  
(398
)
  
1,003
 
             
Cumulative charges to income at end of year
 
$
10,513
  
$
7,168
  
$
6,770
 
             
Addition (reduction) to earnings per share from net
            
after-tax OTTI gain (loss)
 
$
(.14
)
 
$
(.02
)
 
$
.04
 
             
Unrealized gain on investments previously
            
written down at end of the year - see note below
 
$
14,710
  
$
17,127
  
$
13,129
 
Financial information of significant limited partnership investment
The summarized financial information of the significant limited partnership investment as of and for the years ended December 31 is as follows:
  
2015
  
2014
  
2013
 
Total assets
 
$
511,118
  
$
565,500
  
$
493,028
 
Total partners' capital
  
470,783
   
542,700
   
444,337
 
Net increase (decrease) in partners' capital resulting from operations
  
(19,603
)
  
125,700
   
(64,550
)