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Note 7 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Net (charge-offs)/recoveries | $ 265 | $ (6,454) | $ (657) | $ (364)
June 30, 2017 Ending Balance | 115,809 | 122,948 | 115,809 | 122,948
Reserve for impaired loans |  | 7,724 |  | 7,724
Reserve for non-impaired loans | 115,809 | 115,224 | 115,809 | 115,224
Reserve for off-balance sheet credit commitments | 4,513 | 2,124 | 4,513 | 2,124
March 31, 2017 Ending Balance | 115,544 | 134,552 | 118,966 | 138,963
Provision/(credit) for possible credit losses |  | (5,150) | (2,500) | (15,651)
Charge-offs | (527) | (7,633) | (2,285) | (9,961)
Recoveries | 792 | 1,179 | 1,628 | 9,597
Commercial Portfolio Segment [Member] |  |  |  |
Net (charge-offs)/recoveries | (192) | (5,961) | (904) | (7,044)
June 30, 2017 Ending Balance | 46,744 | 50,590 | 46,744 | 50,590
Reserve for impaired loans |  | 1,395 |  | 1,395
Reserve for non-impaired loans | 46,743 | 49,195 | 46,743 | 49,195
Reserve for off-balance sheet credit commitments | 2,583 | 1,969 | 2,583 | 1,969
March 31, 2017 Ending Balance | 47,276 | 56,381 | 49,203 | 56,199
Provision/(credit) for possible credit losses | (340) | 170 | (1,556) | 1,435
Charge-offs | (527) | (6,688) | (1,730) | (8,758)
Recoveries | 335 | 727 | 826 | 1,714
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Net (charge-offs)/recoveries | 47 | 47 | 96 | 7,323
June 30, 2017 Ending Balance | 17,844 | 10,753 | 17,844 | 10,753
Reserve for impaired loans |  |  |  |
Reserve for non-impaired loans | 17,844 | 10,753 | 17,844 | 10,753
Reserve for off-balance sheet credit commitments | 1,707 |  | 1,707 |
March 31, 2017 Ending Balance | 19,768 | 12,744 | 23,268 | 22,170
Provision/(credit) for possible credit losses | (1,971) | (2,038) | (5,520) | (18,740)
Charge-offs |  |  |  |
Recoveries | 47 | 47 | 96 | 7,323
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Net (charge-offs)/recoveries | 403 | (546) | 136 | (513)
June 30, 2017 Ending Balance | 36,840 | 46,090 | 36,840 | 46,090
Reserve for impaired loans |  | 5,891 |  | 5,891
Reserve for non-impaired loans | 36,840 | 40,199 | 36,840 | 40,199
Reserve for off-balance sheet credit commitments | 74 | 34 | 74 | 34
March 31, 2017 Ending Balance | 35,960 | 50,451 | 34,864 | 49,440
Provision/(credit) for possible credit losses | 477 | (3,815) | 1,840 | (2,837)
Charge-offs |  | (945) | (555) | (1,055)
Recoveries | 403 | 399 | 691 | 542
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Net (charge-offs)/recoveries | 7 | 6 | 15 | (130)
June 30, 2017 Ending Balance | 14,364 | 15,503 | 14,364 | 15,503
Reserve for impaired loans |  | 438 |  | 438
Reserve for non-impaired loans | 14,364 | 15,065 | 14,364 | 15,065
Reserve for off-balance sheet credit commitments | 143 | 119 | 143 | 119
March 31, 2017 Ending Balance | 12,526 | 14,969 | 11,620 | 11,145
Provision/(credit) for possible credit losses | 1,831 | 528 | 2,729 | 4,488
Charge-offs |  |  |  | (148)
Recoveries | 7 | 6 | 15 | 18
Installment and Other Loans [Member ] |  |  |  |
Net (charge-offs)/recoveries |  |  |  |
June 30, 2017 Ending Balance | 17 | 12 | 17 | 12
Reserve for impaired loans |  |  |  |
Reserve for non-impaired loans | 18 | 12 | 18 | 12
Reserve for off-balance sheet credit commitments | 6 | 2 | 6 | 2
March 31, 2017 Ending Balance | 14 | 7 | 11 | 9
Provision/(credit) for possible credit losses | 3 | 5 | 7 | 3
Charge-offs |  |  |  |
Recoveries |  |  |  |

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
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- Definition Reserve For Off-Balance Sheet Credit Commitments + References No definition available. + Details
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- Definition Reserve To Impaired Loans + References No definition available. + Details
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- Definition Reserve To Non-Impaired Loans + References No definition available. + Details
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- 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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- 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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