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Note 5 - Loans (Details) - Troubled Debt Restructuring (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 5 - Loans (Details) - Troubled Debt Restructuring [Line Items] |  |  |
No. of Loans | 60 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 64 us-gaap_FinancingReceivableModificationsNumberOfContracts2 |
Specific Reserve | $ 11,798 us-gaap_ImpairedFinancingReceivableRelatedAllowance | $ 13,284 us-gaap_ImpairedFinancingReceivableRelatedAllowance |
Commercial Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) - Troubled Debt Restructuring [Line Items] |  |  |
No. of Loans | 4 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 9 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 9 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Pre-Modification Recorded Investment | 10,539 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 12,026 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 3,646 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Post-Modification Recorded Investment | 10,539 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 10,860 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 3,646 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Specific Reserve | 21 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 550 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 1,213 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Charge-offs |  | 1,166 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember |
Commercial Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) - Troubled Debt Restructuring [Line Items] |  |  |
No. of Loans | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 5 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 20 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Pre-Modification Recorded Investment | 11,817 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 13,090 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 62,118 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Post-Modification Recorded Investment | 11,817 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 13,090 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 58,393 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Specific Reserve | 5,550 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 329 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 27 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Charge-offs |  |  | 3,725 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_CommercialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Residential Mortgage Loans [Member] | Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) - Troubled Debt Restructuring [Line Items] |  |  |
No. of Loans | 7 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 11 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 14 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Pre-Modification Recorded Investment | 2,715 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 3,736 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 4,305 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Post-Modification Recorded Investment | 2,715 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 3,658 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 4,223 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Specific Reserve | 29 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 103 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 162 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Charge-offs |  | 78 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 82 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = caty_ResidentialMortgageLoansMember / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Accruing Troubled Debt Restructuring [Member] |  |  |
Note 5 - Loans (Details) - Troubled Debt Restructuring [Line Items] |  |  |
No. of Loans | 14 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 25 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 43 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Pre-Modification Recorded Investment | 25,071 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 28,852 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 70,069 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Post-Modification Recorded Investment | 25,071 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 27,608 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 66,262 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Specific Reserve | 5,600 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 982 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | 1,402 us-gaap_ImpairedFinancingReceivableRelatedAllowance / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember
Charge-offs |  | $ 1,244 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / caty_TroubledDebtRestructuringsByLoanStatusAxis = caty_AccruingTroubledDebtRestructuringMember | $ 3,807 us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown / 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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