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Note 11 - Capital Resources (Details) - Outstanding Junior Subordinated Notes (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | May 31, 2014
Subordinated Borrowing [Line Items] |  |
Principal balance of notes | $ 119,136 us-gaap_JuniorSubordinatedNotes | $ 119,100 us-gaap_JuniorSubordinatedNotes
Cathay Capital Trust I [Member] |  |
Subordinated Borrowing [Line Items] |  |
Issuance date | Jun. 26, 2003 |
Principal balance of notes | 20,619 us-gaap_JuniorSubordinatedNotes / us-gaap_DebtInstrumentAxis = caty_CathayCapitalTrustIMember |
Not redeemable until date | Jun. 30, 2008 |
Stated maturity date | Jun. 30, 2033 |
Annualized coupon rate | 3-month LIBOR+ 3.15% |
Current interest rate | 3.41%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = caty_CathayCapitalTrustIMember |
Date of rate change | Dec. 30, 2014 |
Payable/distribution date | March 30 June 30 September 30 December 30 |
Cathay Statutory Trust I [Member] |  |
Subordinated Borrowing [Line Items] |  |
Issuance date | Sep. 17, 2003 |
Principal balance of notes | 20,619 us-gaap_JuniorSubordinatedNotes / us-gaap_DebtInstrumentAxis = caty_CathayStatutoryTrustIMember |
Not redeemable until date | Sep. 17, 2008 |
Stated maturity date | Sep. 17, 2033 |
Annualized coupon rate | 3-month LIBOR + 3.00% |
Current interest rate | 3.24%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = caty_CathayStatutoryTrustIMember |
Date of rate change | Dec. 17, 2014 |
Payable/distribution date | March 17 June 17 September 17 December 17 |
Cathay Capital Trust II [Member] |  |
Subordinated Borrowing [Line Items] |  |
Issuance date | Dec. 30, 2003 |
Principal balance of notes | 12,887 us-gaap_JuniorSubordinatedNotes / us-gaap_DebtInstrumentAxis = caty_CathayCapitalTrustIIMember |
Not redeemable until date | Mar. 30, 2009 |
Stated maturity date | Mar. 30, 2034 |
Annualized coupon rate | 3-month LIBOR + 2.90% |
Current interest rate | 3.16%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = caty_CathayCapitalTrustIIMember |
Date of rate change | Dec. 30, 2014 |
Payable/distribution date | March 30 June 30 September 30 December 30 |
Cathay Capital Trust III [Member] |  |
Subordinated Borrowing [Line Items] |  |
Issuance date | Mar. 28, 2007 |
Principal balance of notes | 46,392 us-gaap_JuniorSubordinatedNotes / us-gaap_DebtInstrumentAxis = caty_CathayCapitalTrustIIIMember |
Not redeemable until date | Jun. 15, 2012 |
Stated maturity date | Jun. 15, 2037 |
Annualized coupon rate | 3-month LIBOR + 1.48% |
Current interest rate | 1.72%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = caty_CathayCapitalTrustIIIMember |
Date of rate change | Dec. 15, 2014 |
Payable/distribution date | March 15 June 15 September 15 December 15 |
Cathay Capital Trust IV [Member] |  |
Subordinated Borrowing [Line Items] |  |
Issuance date | May 31, 2007 |
Principal balance of notes | $ 18,619 us-gaap_JuniorSubordinatedNotes / us-gaap_DebtInstrumentAxis = caty_CathayCapitalTrustIVMember |
Not redeemable until date | Sep. 06, 2012 |
Stated maturity date | Sep. 06, 2037 |
Annualized coupon rate | 3-month LIBOR + 1.4% |
Current interest rate | 1.64%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = caty_CathayCapitalTrustIVMember |
Date of rate change | Dec. 08, 2014 |
Payable/distribution date | March 6 June 6 September 6 December 6 |

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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