XML 77 R56.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Note 3 - Cash and Cash Equivalents (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Note 3 - Cash and Cash Equivalents (Details) [Line Items] |  |
Average Reserve Balances Required to Be Maintained With Federal Bank | $ 0 | $ 138,000
Average Excess Balances Maintained With Federal Reserve Bank | 163,300,000 | $ 170,100,000
Interest Rate Swap [Member] |  |
Note 3 - Cash and Cash Equivalents (Details) [Line Items] |  |
Margin Deposit Assets | $ 7,900,000 |

X
- Definition Amount of average balances maintained with Federal Reserve Bank in excess of the average balances required. + References No definition available. + Details
Name: | caty_AverageExcessBalanceMaintainedWithFederalReserveBank
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The average reserve balances required to be maintained with the Federal Bank. + References No definition available. + Details
Name: | caty_AverageReserveBalancesRequiredToBeMaintainedWithFederalBank
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | caty_Note3CashandCashEquivalentsDetailsLineItems
Namespace Prefix: | caty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_MarginDepositAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |