Condensed Financial Information of Parent Company Only Disclosure: Condensed Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents, at Carrying Value	$ 21,094	$ 26,173
Securities Purchased under Agreements to Resell	107,157	12,063
Debt Securities, Available-for-sale	384,974	453,464
Equity Method Investments	10,171	12,308
Other Assets	72,695	82,568
Assets, Total	1,054,303	1,037,516
Other Liabilities	61,049	53,133
Liabilities	592,354	583,902
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	2,237	2,183
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	18,625	18,625
Additional Paid in Capital, Common Stock	122,717	124,395
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,212	(8,310)
Treasury stock, at cost; 3,760,517 and 3,747,210 shares	(69,724)	(66,392)
Retained Earnings (Accumulated Deficit)	386,864	380,431
TOTAL IHC STOCKHOLDERS' EQUITY	459,694	448,749
Stockholders' Equity Attributable to Noncontrolling Interest	18	2,682
TOTAL EQUITY	459,712	451,431	$ 434,243
TOTAL LIABILITIES AND EQUITY	$ 1,054,303	$ 1,037,516
Preferred Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Preferred Stock, Shares Authorized	100,000	100,000
Common Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Common Stock, Shares Authorized	23,000,000	23,000,000
Common Stock, Shares, Issued	18,625,458	18,625,458
Common Stock, Shares, Outstanding	14,864,941	14,878,248
Treasury Stock, Shares	3,760,517	3,747,210
Parent Company
Cash and Cash Equivalents, at Carrying Value	$ 895	$ 2,700	$ 2,304
Securities Purchased under Agreements to Resell	39,438	0
Debt Securities, Available-for-sale	3,260	38,270
Equity Method Investments	428,014	456,304
Income Taxes Receivable	9,307	0
Deferred Income Tax Assets, Net	1,517	0
Other Assets	461	281
Assets, Total	482,892	497,555
Other Liabilities	11,491	10,005
Due to Affiliate	6,449	25,035
Accrued Income Taxes	0	6,645
Dividends Payable	3,003	2,256
Liabilities	20,943	43,941
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	2,237	2,183
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	18,625	18,625
Additional Paid in Capital, Common Stock	122,717	124,395
Accumulated Other Comprehensive Income (Loss), Net of Tax	1,212	(8,310)
Treasury stock, at cost; 3,760,517 and 3,747,210 shares	(69,724)	(66,392)
Retained Earnings (Accumulated Deficit)	386,864	380,431
TOTAL IHC STOCKHOLDERS' EQUITY	459,694	448,749
Stockholders' Equity Attributable to Noncontrolling Interest	18	2,682
TOTAL EQUITY	459,712	451,431
TOTAL LIABILITIES AND EQUITY	$ 482,892	$ 497,555
Preferred Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Preferred Stock, Shares Authorized	100,000	100,000
Preferred Stock, Shares Issued	0	0
Common Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Common Stock, Shares Authorized	23,000,000	23,000,000
Common Stock, Shares, Issued	18,625,458	18,625,458
Common Stock, Shares, Outstanding	14,864,941	14,878,248
Treasury Stock, Shares	3,760,517	3,747,210