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Note 7 - Loans (Details) - Troubled Debt Restructuring (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Note 7 - Loans (Details) - Troubled Debt Restructuring [Line Items] |  |  |
Special Reserve | $ 11,044,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance |  | $ 11,798,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 7 - Loans (Details) - Troubled Debt Restructuring [Line Items] |  |  |
No. of Loans | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Pre-Modification Recorded Investment | 850,000 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 8,243,000 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Post-Modification Recorded Investment | 850,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 8,243,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Special Reserve |  | 1,035,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 7 - Loans (Details) - Troubled Debt Restructuring [Line Items] |  |  |
No. of Loans | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |  |
Pre-Modification Recorded Investment | 8,613,000 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |  |
Post-Modification Recorded Investment | 8,613,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |  |
Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 7 - Loans (Details) - Troubled Debt Restructuring [Line Items] |  |  |
No. of Loans | 4 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Pre-Modification Recorded Investment | 1,522,000 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 671,000 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Post-Modification Recorded Investment | 1,374,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 671,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Charge-offs | 148,000 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |  |
Special Reserve | 46,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 36,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Accruing Troubled Debt Restructuring [Member] |  |  |
Note 7 - Loans (Details) - Troubled Debt Restructuring [Line Items] |  |  |
No. of Loans | 8 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 4 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Pre-Modification Recorded Investment | 10,985,000 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 8,914,000 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Post-Modification Recorded Investment | 10,837,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 8,914,000 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Charge-offs | 148,000 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |  |
Special Reserve | $ 46,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | $ 1,071,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |

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- 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=35738203&loc=SL6953676-111524 + Details
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- 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=35738203&loc=SL6953676-111524 + Details
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- 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=35738203&loc=SL6953676-111524 + Details
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- 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=25495931&loc=d3e18845-111554 + Details
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