Condensed Financial Information of Parent Company Only Disclosure: Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents, at Carrying Value	$ 26,173	$ 26,465
Debt Securities, Available-for-sale	453,464	441,912
Equity Method Investments	12,308	15,385
Other Assets	82,568	84,020
Assets, Total	1,037,516	1,040,623
Other Liabilities	53,133	56,453
Liabilities	583,902	604,315
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	2,183	2,065
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	18,625	18,625
Additional Paid in Capital, Common Stock	124,395	124,538
Accumulated Other Comprehensive Income (Loss), Net of Tax	(8,310)	(4,598)
Treasury stock, at cost; 3,747,210 and 3,735,173 shares	(66,392)	(63,404)
Retained Earnings (Accumulated Deficit)	380,431	356,383
TOTAL IHC STOCKHOLDERS' EQUITY	448,749	431,544
Stockholders' Equity Attributable to Noncontrolling Interest	2,682	2,699
TOTAL EQUITY	451,431	434,243	$ 439,256
TOTAL LIABILITIES AND EQUITY	1,037,516	1,040,623
Parent Company
Cash and Cash Equivalents, at Carrying Value	2,700	2,304	$ 3,667
Debt Securities, Available-for-sale	38,270	27,270
Equity Method Investments	456,304	445,697
Other Assets	281	235
Assets, Total	497,555	475,506
Other Liabilities	10,005	8,886
Due to Affiliate	25,035	25,318
Accrued Income Taxes	6,645	3,411
Dividends Payable	2,256	1,583
Liabilities	43,941	39,198
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	2,183	2,065
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	18,625	18,625
Additional Paid in Capital, Common Stock	124,395	124,538
Accumulated Other Comprehensive Income (Loss), Net of Tax	(8,310)	(4,598)
Treasury stock, at cost; 3,747,210 and 3,735,173 shares	(66,392)	(63,404)
Retained Earnings (Accumulated Deficit)	380,431	356,383
TOTAL IHC STOCKHOLDERS' EQUITY	448,749	431,544
Stockholders' Equity Attributable to Noncontrolling Interest	2,682	2,699
TOTAL EQUITY	451,431	434,243
TOTAL LIABILITIES AND EQUITY	$ 497,555	$ 475,506