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Note 7 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Balance | $ 118,966 | $ 138,963
Provision/(credit) for possible credit losses | (2,500) | (10,500)
Charge-offs | (1,759) | (2,329)
Recoveries | 837 | 8,418
Net (charge-offs)/recoveries | (922) | 6,089
Balance | 115,544 | 134,552
Reserve for impaired loans | 2,275 | 7,190
Reserve for non-impaired loans | 113,269 | 127,362
Reserve for off-balance sheet credit commitments | 3,424 | 2,694
Commercial Portfolio Segment [Member] |  |
Balance | 49,203 | 56,199
Provision/(credit) for possible credit losses | (1,214) |
Charge-offs | (1,204) | (2,070)
Recoveries | 491 | 987
Net (charge-offs)/recoveries | (713) | (1,083)
Balance | 47,276 | 56,381
Reserve for impaired loans | 1,062 | 225
Reserve for non-impaired loans | 46,214 | 56,156
Reserve for off-balance sheet credit commitments | 2,243 | 2,641
Real Estate Construction Portfolio Segment [Member] |  |
Balance | 23,268 | 22,170
Provision/(credit) for possible credit losses | (3,549) | (16,702)
Charge-offs |  |
Recoveries | 49 | 7,276
Net (charge-offs)/recoveries | 49 | 7,276
Balance | 19,768 | 12,744
Reserve for impaired loans |  |
Reserve for non-impaired loans | 19,768 | 12,744
Reserve for off-balance sheet credit commitments | 909 |
Commercial Real Estate Portfolio Segment [Member] |  |
Balance | 34,864 | 49,440
Provision/(credit) for possible credit losses | 1,362 | 978
Charge-offs | (555) | (110)
Recoveries | 289 | 143
Net (charge-offs)/recoveries | (266) | 33
Balance | 35,960 | 50,451
Reserve for impaired loans | 818 | 6,593
Reserve for non-impaired loans | 35,142 | 43,858
Reserve for off-balance sheet credit commitments | 120 | 53
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Balance | 11,620 | 11,145
Provision/(credit) for possible credit losses | 898 | 3,961
Charge-offs |  | (149)
Recoveries | 8 | 12
Net (charge-offs)/recoveries | 8 | (137)
Balance | 12,526 | 14,969
Reserve for impaired loans | 395 | 372
Reserve for non-impaired loans | 12,131 | 14,597
Reserve for off-balance sheet credit commitments | 146 |
Installment and Other Loans [Member ] |  |
Balance | 11 | 9
Provision/(credit) for possible credit losses | 3 | (2)
Charge-offs |  |
Recoveries |  |
Net (charge-offs)/recoveries |  |
Balance | 14 | 7
Reserve for impaired loans |  |
Reserve for non-impaired loans | 14 | 7
Reserve for off-balance sheet credit commitments | $ 6 |
Consumer Portfolio Segment [Member] |  |
Provision/(credit) for possible credit losses |  | $ 1,265

X
- Definition Financing Receivable, Allowance For Credit Losses, Net Charge-Offs + References No definition available. + Details
Name: | caty_FinancingReceivableAllowanceForCreditLossesNetChargeOffs
Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of provision (reversal) related to loan transactions based on the assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References No definition available. + Details
Name: | caty_ProvisionReversalForPossibleLoanLosses
Namespace Prefix: | caty_
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X
- Definition Reserve For Off-Balance Sheet Credit Commitments + References No definition available. + Details
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Namespace Prefix: | caty_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reserve To Impaired Loans + References No definition available. + Details
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Period Type: | instant

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- Definition Reserve To Non-Impaired Loans + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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X
- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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X
- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Details
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- Details
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