XML 85 R70.htm IDEA: XBRL DOCUMENT
v3.20.4

Note 4 - Loans - Troubled Debt Restructuring Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Charge-offs | $ 0 | $ (4,063) | $ 0
Accruing Troubled Debt Restructuring [Member] |  |  |
Beginning balance | 35,336 | 65,071 | 68,565
New restructurings | 5,417 | 15,432 | 26,114
Restructured loans restored to accrual status | 263 | 365 | 2,896
Charge-offs | 0 | (1,341) | 0
Payments | (13,295) | (42,895) | (30,406)
Restructured loans placed on non-accrual | 0 | (1,296) | (2,098)
New restructurings | 5,417 | 15,432 | 26,114
Ending balance | 27,721 | 35,336 | 65,071
Non-accruing Troubled Debt Restructuring [Member] |  |  |
Beginning balance | 18,048 | 24,189 | 33,416
New restructurings | 0 | 10,547 | 3,015
Restructured loans restored to accrual status | (263) | (365) | (2,896)
Charge-offs | (4,970) | (3,607) | (2,347)
Payments | (3,830) | (14,012) | (9,097)
Restructured loans placed on non-accrual | 0 | 1,296 | 2,098
New restructurings | 0 | 10,547 | 3,015
Ending balance | $ 8,985 | $ 18,048 | $ 24,189

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | caty_TroubledDebtRestructuringsNewRestructurings
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | caty_TroubledDebtRestructuringsPaymentsReceivedInPeriod
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | caty_TroubledDebtRestructuringsRestructuredLoansPlacedOnNonaccrual
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | caty_TroubledDebtRestructuringsRestructuredLoansRestoredToAccrualStatus
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=caty_AccruingTroubledDebtRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=caty_NonaccruingTroubledDebtRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |