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Note 13 - Stockholders' Equity and Earnings per Share (Details) - Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Beginning balance, (loss)/income, net of tax |  |  |
Beginning balance, (loss)/income, net-of-tax | $ (29,729)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ 465 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Net unrealized gains/(losses) arising during the period |  |  |
Net unrealized gains/(losses) arising during the period, pre-tax | 34,941 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax | (117,515)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax |
Net unrealized gains/(losses) arising during the period, tax expense/ (benefit) | 14,692 caty_OtherComprehensiveIncomeLossBeforeReclassificationsTax | (49,407)caty_OtherComprehensiveIncomeLossBeforeReclassificationsTax |
Net unrealized gains/(losses) arising during the period, net-of-tax | 20,249 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax | (68,108)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax |
Reclassification adjustment for net gains included in net income |  |  |
Reclassification adjustment for net gains included in net income, pre-tax | 6,748 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax | 27,362 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax |
Reclassification adjustment for net gains included in net income, tax expense/ (benefit) | 2,837 caty_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax | 11,503 caty_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax |
Reclassification adjustment for net gains included in net income, net-of-tax | 3,911 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax | 15,859 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale |  | 38,052 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax |
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale |  | 15,997 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesTax |
Net unrealized gains arising from transferring securities held-to-maturity to available-for-sale |  | 22,055 us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax |
Total other comprehensive income/(loss) |  |  |
Total other comprehensive income/(loss), pre-tax | 41,689 us-gaap_OtherComprehensiveIncomeLossBeforeTax | (52,101)us-gaap_OtherComprehensiveIncomeLossBeforeTax |
Total other comprehensive income/(loss), tax expense/ (benefit) | 17,529 us-gaap_OtherComprehensiveIncomeLossTax | (21,907)us-gaap_OtherComprehensiveIncomeLossTax |
Total other comprehensive income/(loss), net-of-tax | 24,160 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (30,194)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 9,197 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending balance, loss, net of tax |  |  |
Ending balance, loss, net-of-tax | (5,569)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (29,729)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 465 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Beginning balance, (loss)/income, net of tax |  |  |
Beginning balance, (loss)/income, net-of-tax | (29,729)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 465 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Net unrealized gains/(losses) arising during the period |  |  |
Net unrealized gains/(losses) arising during the period, pre-tax | 39,077 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (117,515)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Net unrealized gains/(losses) arising during the period, tax expense/ (benefit) | 16,431 caty_OtherComprehensiveIncomeLossBeforeReclassificationsTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (49,407)caty_OtherComprehensiveIncomeLossBeforeReclassificationsTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Net unrealized gains/(losses) arising during the period, net-of-tax | 22,646 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (68,108)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Reclassification adjustment for net gains included in net income |  |  |
Reclassification adjustment for net gains included in net income, pre-tax | 6,748 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 27,362 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Reclassification adjustment for net gains included in net income, tax expense/ (benefit) | 2,837 caty_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 11,503 caty_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Reclassification adjustment for net gains included in net income, net-of-tax | 3,911 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 15,859 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Total other comprehensive income/(loss) |  |  |
Total other comprehensive income/(loss), pre-tax | 45,825 us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (52,101)us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Total other comprehensive income/(loss), tax expense/ (benefit) | 19,268 us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (21,907)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Total other comprehensive income/(loss), net-of-tax | 26,557 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (30,194)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Ending balance, loss, net of tax |  |  |
Ending balance, loss, net-of-tax | (3,172)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (29,729)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Net unrealized gains/(losses) arising during the period |  |  |
Net unrealized gains/(losses) arising during the period, pre-tax | (4,136)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |
Net unrealized gains/(losses) arising during the period, tax expense/ (benefit) | (1,739)caty_OtherComprehensiveIncomeLossBeforeReclassificationsTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |
Net unrealized gains/(losses) arising during the period, net-of-tax | (2,397)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |
Total other comprehensive income/(loss) |  |  |
Total other comprehensive income/(loss), pre-tax | (4,136)us-gaap_OtherComprehensiveIncomeLossBeforeTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |
Total other comprehensive income/(loss), tax expense/ (benefit) | (1,739)us-gaap_OtherComprehensiveIncomeLossTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |
Total other comprehensive income/(loss), net-of-tax | (2,397)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |
Ending balance, loss, net of tax |  |  |
Ending balance, loss, net-of-tax | $ (2,397)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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