XML 104 R85.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Regulatory Capital Requirements and Dividends From Subsidiaries - Basel III Requirements and the PCA well-capitalized Thresholds (Details) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | ---
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basel III Requirements, Total risk-based capital | 0.1050 |
Basel III Requirements, Tier 1 risk-based capital | 0.0850 |
Basel III Requirements, Common equity Tier 1 | 0.0700 |
Basel III Requirements, Tier 1 leverage | 0.0400 |
BancShares |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basel III Requirements, Total risk-based capital | 0.1050 |
Basel III Requirements, Tier 1 risk-based capital | 0.0850 |
Basel III Requirements, Common equity Tier 1 | 0.0700 |
Basel III Requirements, Tier 1 leverage | 0.0400 |
PCA well-capitalized thresholds, Total risk-based capital | 0.1000 |
PCA well-capitalized thresholds, Tier 1 risk-based capital | 0.0800 |
PCA well-capitalized thresholds, Common equity Tier 1 | 0.0650 |
PCA well-capitalized thresholds, Tier 1 leverage | 0.0500 |
Total risk-based capital, amount | $ 5,041,686 | $ 4,577,212
Tier 1 risk-based capital, amount | 4,380,452 | 3,856,086
Common equity Tier 1, amount | 4,040,515 | 3,516,149
Tier 1 leverage, amount | $ 4,380,452 | $ 3,856,086
Total risk-based capital, Ratio | 0.1435 | 0.1381
Tier 1 risk-based capital, Ratio | 0.1247 | 0.1163
Common equity Tier 1, Ratio | 0.1150 | 0.1061
Tier 1 leverage, Ratio | 0.0759 | 0.0786
FCB |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Basel III Requirements, Total risk-based capital | 0.1050 |
Basel III Requirements, Tier 1 risk-based capital | 0.0850 |
Basel III Requirements, Common equity Tier 1 | 0.0700 |
Basel III Requirements, Tier 1 leverage | 0.0400 |
PCA well-capitalized thresholds, Total risk-based capital | 0.1000 |
PCA well-capitalized thresholds, Tier 1 risk-based capital | 0.0800 |
PCA well-capitalized thresholds, Common equity Tier 1 | 0.0650 |
PCA well-capitalized thresholds, Tier 1 leverage | 0.0500 |
Total risk-based capital, amount | $ 4,857,960 | $ 4,543,496
Tier 1 risk-based capital, amount | 4,651,226 | 4,276,870
Common equity Tier 1, amount | 4,651,226 | 4,276,870
Tier 1 leverage, amount | $ 4,651,226 | $ 4,276,870
Total risk-based capital, Ratio | 0.1385 | 0.1372
Tier 1 risk-based capital, Ratio | 0.1326 | 0.1292
Common equity Tier 1, Ratio | 0.1326 | 0.1292
Tier 1 leverage, Ratio | 0.0807 | 0.0872

X
- Definition Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Capital Adequacy Including Conservation Buffer, Minimum + References No definition available. + Details
Name: | fcnca_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyIncludingConservationBufferMinimum
Namespace Prefix: | fcnca_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy Including Conservation Buffer, Minimum + References No definition available. + Details
Name: | fcnca_BankingRegulationTierOneLeverageCapitalRatioCapitalAdequacyIncludingConservationBufferMinimum
Namespace Prefix: | fcnca_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy Including Conservation Buffer, Minimum + References No definition available. + Details
Name: | fcnca_BankingRegulationTierOneRiskBasedCapitalRatioCapitalAdequacyIncludingConservationBufferMinimum
Namespace Prefix: | fcnca_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy Including Conservation Buffer, Minimum + References No definition available. + Details
Name: | fcnca_BankingRegulationTotalRiskBasedCapitalRatioCapitalAdequacyIncludingConservationBufferMinimum
Namespace Prefix: | fcnca_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_Capital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_CapitalToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of Common Equity Tier 1 risk-based capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_CommonEquityTierOneCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_CommonEquityTierOneCapitalRatio
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of Tier 1 leverage capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of Tier 1 capital to average assets as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalToAverageAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of Tier 1 risk-based capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=fcnca_BancSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fcnca_FCBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |