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Note 9 - Deposits (Details) - Time Deposit Maturities (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Other Time Deposits [Member} |
Note 9 - Deposits (Details) - Time Deposit Maturities [Line Items] |
Time deposits, maturities, year one | $ 772,529 us-gaap_TimeDepositMaturitiesYearOne / us-gaap_FinancialInstrumentAxis = caty_OtherTimeDepositsMember
Time deposits, maturities, year two | 162,465 us-gaap_TimeDepositMaturitiesYearTwo / us-gaap_FinancialInstrumentAxis = caty_OtherTimeDepositsMember
Time deposits, maturities, year three | 109,302 us-gaap_TimeDepositMaturitiesYearThree / us-gaap_FinancialInstrumentAxis = caty_OtherTimeDepositsMember
Time deposits, maturities, year four | 116,420 us-gaap_TimeDepositMaturitiesYearFour / us-gaap_FinancialInstrumentAxis = caty_OtherTimeDepositsMember
Time deposits, maturities, year five | 1,820 us-gaap_TimeDepositMaturitiesYearFive / us-gaap_FinancialInstrumentAxis = caty_OtherTimeDepositsMember
Time deposits, maturities, after year five | 11 us-gaap_TimeDepositMaturitiesAfterYearFive / us-gaap_FinancialInstrumentAxis = caty_OtherTimeDepositsMember
Time deposits, maturities, total | 1,162,547 us-gaap_TimeDepositsAtCarryingValue / us-gaap_FinancialInstrumentAxis = caty_OtherTimeDepositsMember
Total Time Deposits [Member] |
Note 9 - Deposits (Details) - Time Deposit Maturities [Line Items] |
Time deposits, maturities, year one | 3,373,672 us-gaap_TimeDepositMaturitiesYearOne / us-gaap_FinancialInstrumentAxis = caty_TotalTimeDepositsMember
Time deposits, maturities, year two | 325,513 us-gaap_TimeDepositMaturitiesYearTwo / us-gaap_FinancialInstrumentAxis = caty_TotalTimeDepositsMember
Time deposits, maturities, year three | 347,635 us-gaap_TimeDepositMaturitiesYearThree / us-gaap_FinancialInstrumentAxis = caty_TotalTimeDepositsMember
Time deposits, maturities, year four | 178,412 us-gaap_TimeDepositMaturitiesYearFour / us-gaap_FinancialInstrumentAxis = caty_TotalTimeDepositsMember
Time deposits, maturities, year five | 42,485 us-gaap_TimeDepositMaturitiesYearFive / us-gaap_FinancialInstrumentAxis = caty_TotalTimeDepositsMember
Time deposits, maturities, after year five | 11 us-gaap_TimeDepositMaturitiesAfterYearFive / us-gaap_FinancialInstrumentAxis = caty_TotalTimeDepositsMember
Time deposits, maturities, total | 4,267,728 us-gaap_TimeDepositsAtCarryingValue / us-gaap_FinancialInstrumentAxis = caty_TotalTimeDepositsMember
Time Deposits 100000 Dollars and Over [Member] |
Note 9 - Deposits (Details) - Time Deposit Maturities [Line Items] |
Time deposits, maturities, year one | 2,601,143 us-gaap_TimeDepositMaturitiesYearOne / invest_InvestmentAxis = caty_TimeDeposits100000DollarsAndOverMember
Time deposits, maturities, year two | 163,048 us-gaap_TimeDepositMaturitiesYearTwo / invest_InvestmentAxis = caty_TimeDeposits100000DollarsAndOverMember
Time deposits, maturities, year three | 238,333 us-gaap_TimeDepositMaturitiesYearThree / invest_InvestmentAxis = caty_TimeDeposits100000DollarsAndOverMember
Time deposits, maturities, year four | 61,992 us-gaap_TimeDepositMaturitiesYearFour / invest_InvestmentAxis = caty_TimeDeposits100000DollarsAndOverMember
Time deposits, maturities, year five | 40,665 us-gaap_TimeDepositMaturitiesYearFive / invest_InvestmentAxis = caty_TimeDeposits100000DollarsAndOverMember
Time deposits, maturities, total | $ 3,105,181 us-gaap_TimeDepositsAtCarryingValue / invest_InvestmentAxis = caty_TimeDeposits100000DollarsAndOverMember

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- Definition Amount of time deposits maturing after the fifth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of time deposits maturing in the fifth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of time deposits maturing in the fourth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of time deposits maturing in the next fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of time deposits maturing in the third fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of time deposits maturing in the second fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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