XML 58 R47.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Note 7 - Loans - Troubled Debt Restructuring (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
No. of Contracts | 1 | 6 | 3 | 6
Pre-Modification Outstanding Recorded Investment | $ 500,000 | $ 5,211,000 | $ 28,183,000 | $ 5,211,000
Post-Modification Outstanding Recorded Investment | 500,000 | 5,211,000 | 28,183,000 | 5,211,000
Charge-offs |  |  |  |
Special Reserve |  | $ 171,000 |  | $ 171,000
Commercial Portfolio Segment [Member] |  |  |  |
No. of Contracts | 1 | 4 | 1 | 4
Pre-Modification Outstanding Recorded Investment | $ 500,000 | $ 4,844,000 | $ 500,000 | $ 4,844,000
Post-Modification Outstanding Recorded Investment | 500,000 | 4,844,000 | 500,000 | 4,844,000
Charge-offs |  |  | 2,100,000 |
Special Reserve |  | $ 148,000 |  | $ 148,000
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
No. of Contracts |  | 2 |  | 2
Pre-Modification Outstanding Recorded Investment |  | $ 367,000 |  | $ 367,000
Post-Modification Outstanding Recorded Investment |  | 367,000 |  | 367,000
Charge-offs |  |  |  |
Special Reserve |  | $ 23,000 |  | $ 23,000
Real Estate Construction Portfolio Segment [Member] |  |  |  |
No. of Contracts |  |  | 2 |
Pre-Modification Outstanding Recorded Investment |  |  | $ 27,683,000 |
Post-Modification Outstanding Recorded Investment |  |  | 27,683,000 |
Charge-offs |  |  |  |
Special Reserve |  |  |  |

X
- Definition Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings. + References No definition available. + Details
Name: | us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=caty_ResidentialMortgageAndEquityLinesPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=caty_RealEstateConstructionPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |