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Investments (Tables)
 3 Months Ended
Mar. 31, 2023
Investments Including Short Term And Cash And Cash Equivalents [Abstract]  
Investments Including Short Term And Cash And Cash Equivalents [Table Text Block]
The Company invests primarily in fixed maturity securities, which totaled 87.0% of total cash and invested assets at March 31, 2023, as shown below.

Carrying Value
(In thousands, except for %)
March 31, 2023December 31, 2022
Amount%Amount%
Cash and invested assets:
Fixed maturity securities$1,229,691 87.0 %1,179,619 86.5 %
Equity securities11,899 0.8 %11,590 0.8 %
Policy loans78,659 5.6 %78,773 5.8 %
Other long-term investments72,254 5.1 %69,558 5.1 %
Short-term investments1,244 0.1 %1,241 0.1 %
Cash and cash equivalents18,924 1.4 %22,973 1.7 %
Total cash and invested assets$1,412,671 100.0 %1,363,754 100.0 %
Debt and Equity Securities, Unrealized Gain (Loss)  
Unrealized Gain (Loss) on Investments [Table Text Block]
The following tables represent the amortized cost, gross unrealized gains and losses and fair value of fixed maturity securities as of the dates indicated.
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
March 31, 2023
(In thousands)
Fixed maturity securities:    
Available-for-sale:    
U.S. Treasury securities$5,720 215 10 5,925 
U.S. Government-sponsored enterprises3,427 337 1 3,763 
States and political subdivisions334,887 2,311 28,618 308,580 
Corporate:
Financial249,030 790 36,119 213,701 
Consumer250,189 1,634 38,514 213,309 
Utilities121,236 269 20,204 101,301 
Energy74,564 42 8,840 65,766 
All other186,640 813 22,556 164,897 
Commercial mortgage-backed171 — 3 168 
Residential mortgage-backed110,579 10 7,686 102,903 
Asset-backed51,376 333 2,432 49,277 
Foreign governments100 1 — 101 
Total fixed maturity securities$1,387,919 6,755 164,983 1,229,691 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
December 31, 2022
(In thousands)
Fixed maturity securities:    
Available-for-sale:    
U.S. Treasury securities$9,425 152 9 9,568 
U.S. Government-sponsored enterprises3,434 277 1 3,710 
States and political subdivisions344,208 1,114 37,964 307,358 
Corporate:
Financial243,758 512 42,383 201,887 
Consumer247,824 758 47,138 201,444 
Utilities115,738 39 23,790 91,987 
Energy76,065 — 11,395 64,670 
All other184,022 683 29,048 155,657 
Commercial mortgage-backed171 — 2 169 
Residential mortgage-backed110,582 9 10,765 99,826 
Asset-backed45,991 18 2,767 43,242 
Foreign governments100 1 — 101 
Total fixed maturity securities$1,381,318 3,563 205,262 1,179,619 
Equity Securities, Restricted  
Schedule of Equity Securities [Table Text Block]
Most of the Company's equity securities are diversified stock and bond mutual funds.

Fair Value
(In thousands)
March 31, 2023December 31, 2022
Equity securities: 
Stock mutual funds$2,683 2,615 
Bond mutual funds4,409 4,337 
Common stock924 857 
Non-redeemable preferred stock9 8 
Non-redeemable preferred stock fund3,874 3,773 
Total equity securities$11,899 11,590 
Unrealized Continuous Losses on Investments [Abstract]  
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables present the fair values and gross unrealized losses of fixed maturity securities that are not deemed to have credit losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position at March 31, 2023 and December 31, 2022.

March 31, 2023Less than 12 monthsGreater than 12 monthsTotal
(In thousands, except for # of securities)Fair
Value		Unrealized
Losses		# of
Securities		Fair
Value		Unrealized
Losses		# of
Securities		Fair
Value		Unrealized
Losses		# of
Securities
Fixed maturity securities:        
Available-for-sale securities:         
U.S. Treasury securities$514 2 2 66 8 2 580 10 4 
U.S. Government-sponsored enterprises223 1 1 — — — 223 1 1 
States and political subdivisions111,550 5,674 131 80,193 22,944 100 191,743 28,618 231 
Corporate:
Financial102,783 9,440 119 89,543 26,679 130 192,326 36,119 249 
Consumer81,680 5,352 90 108,995 33,162 153 190,675 38,514 243 
Utilities30,814 2,271 55 61,557 17,933 104 92,371 20,204 159 
Energy36,270 2,270 41 26,992 6,570 37 63,262 8,840 78 
All Other93,285 6,463 99 57,461 16,093 80 150,746 22,556 179 
Commercial mortgage-backed168 3 2 — — — 168 3 2 
Residential mortgage-backed101,277 7,354 87 1,296 332 12 102,573 7,686 99 
Asset-backed12,725 692 19 23,609 1,740 28 36,334 2,432 47 
Total fixed maturity securities$571,289 39,522 646 449,712 125,461 646 1,021,001 164,983 1,292 

December 31, 2022Less than 12 monthsGreater than 12 monthsTotal
(In thousands, except for # of securities)Fair
Value		Unrealized
Losses		# of
Securities		Fair
Value		Unrealized
Losses		# of
Securities		Fair
Value		Unrealized
Losses		# of
Securities
Fixed maturity securities:        
Available-for-sale securities:         
U.S. Treasury securities$— — — 64 9 2 64 9 2 
U.S. Government-sponsored enterprises223 1 1 — — — 223 1 1 
States and political subdivisions189,084 30,866 242 14,184 7,098 14 203,268 37,964 256 
Corporate:
Financial182,447 39,122 237 6,144 3,261 16 188,591 42,383 253 
Consumer164,224 34,823 220 23,417 12,315 30 187,641 47,138 250 
Utilities73,483 15,959 152 16,413 7,831 18 89,896 23,790 170 
Energy59,053 9,601 75 5,617 1,794 8 64,670 11,395 83 
All Other140,955 25,337 171 7,910 3,711 15 148,865 29,048 186 
Commercial mortgage-backed168 2 2 — — — 168 2 2 
Residential mortgage-backed98,758 10,514 95 759 251 5 99,517 10,765 100 
Asset-backed37,067 2,485 41 4,264 282 9 41,331 2,767 50 
Total fixed maturity securities$945,462 168,710 1,236 78,772 36,552 117 1,024,234 205,262 1,353 
Debt and Equity Securities, Realized Gain (Loss)  
Schedule of Realized Gain (Loss) [Table Text Block]
The Company uses the specific identification method of the individual security to determine the cost basis used in the calculation of realized gains and losses related to security sales.  

Three Months Ended
March 31,
(In thousands)20232022
Fixed maturity securities, available-for-sale:
Proceeds$2,865 1,100 
Gross realized gains$5 — 
Gross realized losses$12 — 
Schedule of Maturities by Contractual Maturity Date [Abstract]  
Investments Classified by Contractual Maturity Date [Table Text Block]
The amortized cost and fair value of fixed maturity securities at March 31, 2023 by contractual maturity are shown in the table below.  Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date have been reflected based upon final stated maturity.

March 31, 2023Amortized
Cost		Fair
Value
(In thousands)
Fixed maturity securities:  
Due in one year or less$9,753 9,718 
Due after one year through five years131,003 129,487 
Due after five years through ten years248,095 240,207 
Due after ten years999,068 850,279 
Total fixed maturity securities$1,387,919 1,229,691