XML 71 R59.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Note 10 - Borrowed Funds (Details Textual) - USD ($) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 12, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Nov. 14, 2017
Securities Sold under Agreements to Repurchase, Total |  | $ 50,000,000 | $ 100,000,000 |
Weighted Average Rate Of Securities Sold Under Agreements |  | 2.98% | 2.86% |
Advances from Federal Home Loan Banks, Total |  | $ 480,000,000 | $ 430,000,000 |
SinoPac Bancorp [Member] |  |  |  |
Business Combination, Deferred Payments |  | $ 35,200,000 |  | $ 35,400,000
Business Combination, Deferred Payments, Disbursed Rate, In Next Twelve Months |  | 50.00% |  |
Business Combination, Deferred Payments, Disbursed Rate, In Year Two |  | 30.00% |  |
Business Combination, Deferred Payments, Disbursed Rate, In Year Three |  | 20.00% |  |
Debt Instrument, Face Amount |  | $ 36,000,000 | $ 35,200,000 |
Debt Instrument, Interest Rate, Effective Percentage |  | 2.80% |  |
Mature in July 2018 [Member] |  |  |  |
Advances from Federal Home Loan Banks, Total |  | $ 245,000,000 |  |
Mature in October 2018 [Member] |  |  |  |
Advances from Federal Home Loan Banks, Total |  | 5,000,000 |  |
Mature in December 2019 [Member] |  |  |  |
Advances from Federal Home Loan Banks, Total |  | 50,000,000 |  |
Mature in May 2023 [Member] |  |  |  |
Advances from Federal Home Loan Banks, Total |  | $ 20,000,000 |  |
Business Combination, Deferred Payments [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |
Term Loan [Member] | US Bank [Member] |  |  |  |
Debt Instrument, Face Amount | $ 75,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.75% | 3.125% |
Debt Instrument, Periodic Payment, Principal | $ 4,700,000 |  |  |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | US Bank [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75% |  |  |
Over-night Borrowings [Member] |  |  |  |
Advances from Federal Home Loan Banks, Total |  | $ 160,000,000 | $ 325,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  | 2.08% | 1.41% |
Non Overnight Borrowings [Member] |  |  |  |
Advances from Federal Home Loan Banks, Total |  | $ 320,000,000 | $ 105,000,000 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate |  | 1.78% | 1.41% |
Securities Sold under Agreements to Repurchase [Member] |  |  |  |
Investment Securities Pledged As Collateral |  | $ 55,400,000 | $ 108,400,000 |
Fixed Rate Non-callable Securities Sold Under Agreements to Repurchase [Member] | Mature in June 2018 [Member] |  |  |  |
Securities Sold under Agreements to Repurchase, Total |  | $ 50,000,000 |  |

X
- Definition The amount of liabilities payable to a counter party pertain to a business combination. + References No definition available. + Details
Name: | caty_BusinessCombinationDeferredPayments
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The disbursed rate for deferred payments that will be disbursed in next twelve months. + References No definition available. + Details
Name: | caty_BusinessCombinationDeferredPaymentsDisbursedRateInNextTwelveMonths
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The disbursed rate for deferred payments that will be disbursed in year three. + References No definition available. + Details
Name: | caty_BusinessCombinationDeferredPaymentsDisbursedRateInYearThree
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The disbursed rate for deferred payments that will be disbursed in year two. + References No definition available. + Details
Name: | caty_BusinessCombinationDeferredPaymentsDisbursedRateInYearTwo
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Investment securities pledged as collateral. + References No definition available. + Details
Name: | caty_InvestmentSecuritiesPledgedAsCollateral
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted Average Rate Of Securities Sold Under Agreements + References No definition available. + Details
Name: | caty_WeightedAverageRateOfSecuritiesSoldUnderAgreements
Namespace Prefix: | caty_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=caty_SinoPacBancorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=caty_MatureInJuly2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=caty_MatureInOctober2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=caty_MatureInDecember2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=caty_MatureInMay2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=caty_BusinessCombinationDeferredPaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=caty_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=caty_USBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=caty_OvernightBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=caty_NonOvernightBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis=caty_FixedRateNonCallableSecuritiesSoldUnderAgreementsToRepurchaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=caty_MatureInJune2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |