XML 72 R61.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Note 12 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities available-for-sale | $ 1,368,487 | $ 1,314,345
Assets, fair value disclosure | 1,372,623 | 1,316,664
Liabilities, fair value disclosure | 6,366 | 6,997
Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 434,453 | 513,376
Assets, fair value disclosure | 434,453 | 513,376
Liabilities, fair value disclosure |  |
Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 934,034 | 800,969
Assets, fair value disclosure | 938,073 | 803,209
Liabilities, fair value disclosure | 6,366 | 6,997
Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Assets, fair value disclosure | 97 | 79
Liabilities, fair value disclosure |  |
US Treasury Securities [Member] |  |
Securities available-for-sale | 399,436 | 489,017
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 399,436 | 489,017
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
US Government Corporations and Agencies Securities [Member] |  |
Securities available-for-sale | 9,700 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 9,700 |
US Government Corporations and Agencies Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities available-for-sale | 393,722 | 390,331
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 393,722 | 390,331
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Commercial Mortgage Backed Securities [Member] |  |
Securities available-for-sale | 446,065 | 336,260
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 446,065 | 336,260
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available-for-sale | 1,931 |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 1,931 |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Collateralized Mortgage Obligations [Member] |  |
Securities available-for-sale | 1,710 | 28
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 1,710 | 28
Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Corporate Debt Securities [Member] |  |
Securities available-for-sale | 80,906 | 74,350
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale | 80,906 | 74,350
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Mutual Funds [Member] |  |
Securities available-for-sale | 6,271 | 6,230
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 6,271 | 6,230
Mutual Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Mutual Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities available-for-sale | 8,087 | 7,308
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 8,087 | 7,308
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Preferred Stock of Government Sponsored Entities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Other Equity Securities [Member] |  |
Securities available-for-sale | 20,659 | 10,821
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Securities available-for-sale | 20,659 | 10,821
Other Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Securities available-for-sale |  |
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Securities available-for-sale |  |
Warrant [Member] |  |
Assets, fair value disclosure | 97 | 79
Warrant [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value disclosure |  |
Warrant [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value disclosure |  |
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value disclosure | 97 | 79
Interest Rate Swap [Member] |  |
Assets, fair value disclosure | 2,314 | 938
Liabilities, fair value disclosure | 5,049 | 3,744
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value disclosure |  |
Liabilities, fair value disclosure |  |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value disclosure | 2,314 | 938
Liabilities, fair value disclosure | 5,049 | 3,744
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value disclosure |  |
Liabilities, fair value disclosure |  |
Foreign Exchange Contract [Member] |  |
Assets, fair value disclosure | 1,725 | 1,302
Liabilities, fair value disclosure | 1,083 | 3,132
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value disclosure |  |
Liabilities, fair value disclosure |  |
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value disclosure | 1,725 | 1,302
Liabilities, fair value disclosure | 1,083 | 3,132
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value disclosure |  |
Liabilities, fair value disclosure |  |
Option Contracts [Member] |  |
Liabilities, fair value disclosure | 234 | 121
Option Contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, fair value disclosure |  |
Option Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, fair value disclosure | 234 | 121
Option Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, fair value disclosure |  |

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CollateralizedMortgageObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=caty_MutualFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=caty_OtherEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=caty_OptionContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |