XML 125 R107.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Note 17 - Employee Benefit Plans (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Minimum Number of Years Allowed to Participate in Employee Stock Ownership Plan | 2 years |  |
Stock Issued During Period, Shares, Employee Stock Ownership Plan | 16,458 | 19,377 | 18,012
Stock Issued During Period, Value, Employee Stock Ownership Plan | $ 646,000 | $ 600,000 | $ 541,000
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP | 57,014 | 103,367 | 107,202
Employee Stock Ownership Plan (ESOP), Shares in ESOP | 865,167 |  |
Percentage of Outstanding Common Stock under Employee Stock Ownership Plan | 1.10% |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 75.00% |  |
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage, Less Than Two Years of Service | 0.00% |  |
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage, After Two Years of Service | 25.00% |  |
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage, After Two Years of Service, Increment | 25.00% |  |
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage, After Five Years of Service | 100.00% |  |
Defined Contribution Plan, Employer Matching, Percentage of Eligible Compensation, After One Year of Service | 4.00% |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 2,300,000 | $ 2,100,000 | $ 2,000,000
Percentage of Participant Borrowing Capacity of Vested Amount | 50.00% |  |
Maximum [Member] |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service | $ 50,000 |  |
Minimum [Member] |  |  |
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service | $ 1,000 |  |

X
- Definition The percentage of eligible compensation contributed per pay period by the participant after one year of service. + References No definition available. + Details
Name: | caty_DefinedContributionPlanEmployerMatchingPercentageOfEligibleCompensationAfterOneYearOfService
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of matching contributions for employee who is in service five years. + References No definition available. + Details
Name: | caty_DefinedContributionPlanEmployersMatchingContributionVestingPercentageAfterFiveYearsOfService
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of matching contributions for employee who is in service two years. + References No definition available. + Details
Name: | caty_DefinedContributionPlanEmployersMatchingContributionVestingPercentageAfterTwoYearsOfService
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increment annual vesting percentage of matching contributions for employee who is in service after two year until 100% is vested after years of service. + References No definition available. + Details
Name: | caty_DefinedContributionPlanEmployersMatchingContributionVestingPercentageAfterTwoYearsOfServiceIncrement
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of matching contributions for employee who is in service less than two years. + References No definition available. + Details
Name: | caty_DefinedContributionPlanEmployersMatchingContributionVestingPercentageLessThanTwoYearsOfService
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum number of years allowed to participate in employee stock ownership plan. + References No definition available. + Details
Name: | caty_MinimumNumberOfYearsAllowedToParticipateInEmployeeStockOwnershipPlan
Namespace Prefix: | caty_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | caty_PercentageOfOutstandingCommonStockUnderEmployeeStockOwnershipPlan
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of participant borrowing capacity of vested amount. + References No definition available. + Details
Name: | caty_PercentageOfParticipantBorrowingCapacityOfVestedAmount
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash provided by the employer through contributions or dividends that the ESOP used in the period to repay debt and interest on a third-party loan made directly to the ESOP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65888597&loc=d3e16545-113920 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPDebtStructureDirectLoanEmployerCashPaymentsUsedForDebtService
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This item represents the number of shares provided to the Employee Stock Ownership Plan (ESOP) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPSharesContributedToESOP
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65888597&loc=d3e16649-113920 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate value of stock issued during the period as a result of employee stock ownership plan (ESOP). + 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65888597&loc=d3e16649-113920 Reference 4: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |