XML 86 R71.htm IDEA: XBRL DOCUMENT
v3.20.4

Note 4 - Loans - Portfolio by Risk Rating (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loans | $ 15,644,396 | $ 15,075,481
Commercial Portfolio Segment [Member] |  |
Loans | 2,836,833 | 2,778,744
Real Estate Construction Portfolio Segment [Member] |  |
Loans | 679,492 | 579,864
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 7,555,027 | 7,275,262
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 4,569,944 | 4,436,561
Consumer Portfolio Segment [Member] |  |
Loans | 3,100 | 5,050
Pass [Member] |  |
Loans | 14,927,044 | 14,415,729
Pass [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 2,581,128 | 2,528,944
Pass [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans | 593,196 | 461,597
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 7,202,568 | 6,992,933
Pass [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 4,547,052 | 4,427,205
Pass [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 3,100 | 5,050
Special Mention [Member] |  |
Loans | 421,284 | 477,071
Special Mention [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 141,344 | 166,016
Special Mention [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans | 82,010 | 113,687
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 186,283 | 196,454
Special Mention [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 11,647 | 914
Special Mention [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 0 | 0
Substandard [Member] |  |
Loans | 290,495 | 182,681
Substandard [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 108,788 | 83,784
Substandard [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans | 4,286 | 4,580
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 166,176 | 85,875
Substandard [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 11,245 | 8,442
Substandard [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 0 | 0
Doubtful [Member] |  |
Loans | 5,573 | 0
Doubtful [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 5,573 | 0
Doubtful [Member] | Real Estate Construction Portfolio Segment [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans | 0 | 0
Doubtful [Member] | Consumer Portfolio Segment [Member] |  |
Loans | $ 0 | $ 0

X
- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=caty_RealEstateConstructionPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=caty_ResidentialMortgageAndEquityLinesPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |