XML 100 R79.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Note 7 - Investments in Affordable Housing and Alternative Energy Partnerships (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Note 7 - Investments in Affordable Housing and Alternative Energy Partnerships (Details) [Line Items] |  |  |
Affordable Housing Investments | $ 172.7 | $ 104.6 |
Affordable Housing Investments, Net | $ 172.4 | $ 104.6 |
Number of Limited Partnerships in Housing Investments | 7 | 7 |
Increase in Total Assets and Liabilities from Consolidating Affordable Housing Equity Interest | $ 24.3 | $ 24.8 |
Other Borrowings from Consolidating Affordable Housing Equity Interest | 18.6 | 19.9 |
Other Liabilities from Affordable Housing Unfunded Commitments | $ 85.8 | 22.0 |
Minimum Compliance Period Tax Credits Investments in Affordable Housing | 15 years |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | $ 10.1 | $ 10.2 | $ 9.8
Alternative Energy Tax Credit Partnership Investments, Net | 10.5 |  |
Energy Tax Credits Used, Amount | 20.9 |  |
Domestic Tax Authority [Member] | Affordable Housing Limited Partnerships [Member] |  |  |
Note 7 - Investments in Affordable Housing and Alternative Energy Partnerships (Details) [Line Items] |  |  |
Remaining and Future Available Tax Credit | 112.1 |  |
State and Local Jurisdiction [Member] | Affordable Housing Limited Partnerships [Member] |  |  |
Note 7 - Investments in Affordable Housing and Alternative Energy Partnerships (Details) [Line Items] |  |  |
Remaining and Future Available Tax Credit | $ 3.3 |  |

X
- Definition Represents investments in affordable housing. + References No definition available. + Details
Name: | caty_AffordableHousingInvestments
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the net investments in affordable housing. + References No definition available. + Details
Name: | caty_AffordableHousingInvestmentsNet
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the net investments in the alternative energy tax credit partnership. + References No definition available. + Details
Name: | caty_AlternativeEnergyTaxCreditPartnershipInvestmentsNet
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of energy tax credits used during the period. + References No definition available. + Details
Name: | caty_EnergyTaxCreditsUsedAmount
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase in total assets and liabilities from consolidating affordable housing equity interest. + References No definition available. + Details
Name: | caty_IncreaseInTotalAssetsAndLiabilitiesFromConsolidatingAffordableHousingEquityInterest
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The minimum compliance period tax credits investments in affordable housing. + References No definition available. + Details
Name: | caty_MinimumCompliancePeriodTaxCreditsInvestmentsInAffordableHousing
Namespace Prefix: | caty_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | caty_Note7InvestmentsinAffordableHousingandAlternativeEnergyPartnershipsDetailsLineItems
Namespace Prefix: | caty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Limited Partnerships in housing investments. + References No definition available. + Details
Name: | caty_NumberOfLimitedPartnershipsInHousingInvestments
Namespace Prefix: | caty_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Other borrowings from consolidating affordable housing equity interest. + References No definition available. + Details
Name: | caty_OtherBorrowingsFromConsolidatingAffordableHousingEquityInterest
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other liabilities from affordable housing unfunded commitments. + References No definition available. + Details
Name: | caty_OtherLiabilitiesFromAffordableHousingUnfundedCommitments
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Tax credit remaining and available for future use. + References No definition available. + Details
Name: | caty_RemainingAndFutureAvailableTaxCredit
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
Name: | us-gaap_IncomeTaxReconciliationTaxCreditsInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentAxis=caty_AffordableHousingLimitedPartnershipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |