XML 35 R19.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Repurchase Agreements | 12 Months Ended
--- | ---
Dec. 31, 2017
Repurchase Agreements [Abstract] |
Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] | NOTE K REPURCHASE AGREEMENTS BancShares utilizes securities sold under agreements to repurchase to facilitate the needs of our customers and secure wholesale funding needs. Repurchase agreements are transactions whereby BancShares offers to sell to a counterparty an undivided interest in an eligible security at an agreed upon purchase price, and which obligates BancShares to repurchase the security on an agreed upon date at an agreed upon repurchase price plus interest at an agreed upon rate. Securities sold under agreements to repurchase are recorded at the amount of cash received in connection with the transaction and are generally reflected as short-term borrowings on the Consolidated Balance Sheets. BancShares monitors collateral levels on a continuous basis and maintains records of each transaction specifically describing the applicable security and the counterparty’s fractional interest in that security, and segregates the security from general assets in accordance with regulations governing custodial holdings of securities. The primary risk with our repurchase agreements is market risk associated with the investments securing the transactions, as additional collateral may be required based on fair value changes of the underlying investments. Securities pledged as collateral under repurchase agreements are maintained with safekeeping agents. The carrying value of available for sale investment securities pledged as collateral under repurchase agreements was $684.2 million and $690.8 million at December 31, 2017 and December 31, 2016, respectively. The remaining contractual maturity of the securities sold under agreements to repurchase by class of collateral pledged included in borrowings on the Consolidated Balance Sheets as of December 31, 2017 and December 31, 2016 is presented in the following tables.
| December 31, 2017
| Remaining Contractual Maturity of the Agreements
(Dollars in thousands) | Overnight and continuous |  | Up to 30 Days |  | 30-90 Days |  | Greater than 90 Days |  | Total
Repurchase agreements |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 556,171 |  |  | $ | — |  |  | $ | 30,000 |  |  | $ | — |  |  | $ | 586,171 |
Gross amount of recognized liabilities for repurchase agreements |  | $ | 586,171 |
| December 31, 2016
| Remaining Contractual Maturity of the Agreements
| Overnight and continuous |  | Up to 30 Days |  | 30-90 Days |  | Greater than 90 Days |  | Total
Repurchase agreements |  |  |  |  |  |  |  |  |
U.S. Treasury | $ | 590,772 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,000 |  |  | $ | 620,772 |
Gross amount of recognized liabilities for repurchase agreements |  | $ | 620,772 |

X
- Definition Repurchase Agreements [Abstract] + References No definition available. + Details
Name: | fcnca_RepurchaseAgreementsAbstract
Namespace Prefix: | fcnca_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for repurchase agreements (also known as repos), resale agreements (also known as reverse repurchase agreements or reverse repos), securities borrowed transactions, and securities loaned transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -URI http://asc.fasb.org/topic&trid=2197590 + Details
Name: | us-gaap_RepurchaseAgreementsResaleAgreementsSecuritiesBorrowedAndSecuritiesLoanedDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration