Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,332,632	$ 1,321,487
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	100,027	169,806
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	12,072	1,910
Debt Securities, Available-for-sale	1,420,587	1,489,383
US Treasury Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	9,508	9,529
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,513	1,797
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	11,021	11,326
US Government Agencies Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,483	3,490
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,034	1,301
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	4,517	4,791
US States and Political Subdivisions Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	370,995	377,462
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	24,819	32,751
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,955	548
Debt Securities, Available-for-sale	393,859	409,665
Corporate Debt Securities Financial Sector Member [Domain]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	207,547	204,160
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	15,269	31,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,621	13
Debt Securities, Available-for-sale	221,195	235,147
Corporate Debt Security Consumer Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	204,988	196,648
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	16,745	30,116
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3,034	245
Debt Securities, Available-for-sale	218,699	226,519
Corporate Debt Security Energy Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	79,422	81,223
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4,904	8,174
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,092	536
Debt Securities, Available-for-sale	83,234	88,861
Corporate Debt Security All Other Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	294,528	284,209
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	21,395	42,554
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	4,261	82
Debt Securities, Available-for-sale	311,662	326,681
Commercial Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		225
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		4
Debt Securities, Available-for-sale		221
Residential Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	118,186	118,144
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	14,006	21,819
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	46	0
Debt Securities, Available-for-sale	132,146	139,963
Asset-backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	43,874	46,295
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	327	278
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	63	482
Debt Securities, Available-for-sale	44,138	46,091
Foreign Government, Non-US [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	101	102
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	15	16
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale	$ 116	$ 118

[Line Items] for Gross Unrealized Gains and Losses [Table]

No definition available.

Name:	cia_GrossUnrealizedGainsandLossesLineItems
Namespace Prefix:	cia_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=cia_CorporateDebtSecuritiesFinancialSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=cia_CorporateDebtSecurityConsumerSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=cia_CorporateDebtSecurityEnergySectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=cia_CorporateDebtSecurityAllOtherSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: