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Note 7 - Loans (Details) - Allowance for Loan Losses by Portfolio Segment - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance, beginning | $ 138,963 | $ 161,420
Provision/(reversal) for possible loan losses | (10,500) | (5,000)
Charge-offs | (2,329) | (4,464)
Recoveries | 8,418 | 4,133
Net charge-offs | 6,089 | (331)
Balance, ending | 134,552 | 156,089
Reserve to impaired loans | 7,190 | 11,044
Reserve to non-impaired loans | 127,362 | 145,045
Reserve for off-balance sheet credit commitments | 2,694 | 1,652
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance, beginning | 56,199 | 47,501
Provision/(reversal) for possible loan losses | 1,265 | 793
Charge-offs | (2,070) | (864)
Recoveries | 987 | 2,275
Net charge-offs | (1,083) | 1,411
Balance, ending | 56,381 | 49,705
Reserve to impaired loans | 225 | 3,911
Reserve to non-impaired loans | 56,156 | 45,794
Reserve for off-balance sheet credit commitments | 2,641 | 903
Real Estate Construction Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance, beginning | 22,170 | 27,652
Provision/(reversal) for possible loan losses | (16,702) | (4,427)
Recoveries | 7,276 | 45
Net charge-offs | 7,276 | 45
Balance, ending | 12,744 | 23,270
Reserve to non-impaired loans | 12,744 | 23,270
Reserve for off-balance sheet credit commitments |  | 527
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance, beginning | 49,440 | 74,673
Provision/(reversal) for possible loan losses | 978 | (1,697)
Charge-offs | (110) | (3,452)
Recoveries | 143 | 1,794
Net charge-offs | 33 | (1,658)
Balance, ending | 50,451 | 71,318
Reserve to impaired loans | 6,593 | 6,635
Reserve to non-impaired loans | 43,858 | 64,683
Reserve for off-balance sheet credit commitments | 53 | 181
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance, beginning | 11,145 | 11,578
Provision/(reversal) for possible loan losses | 3,961 | 328
Charge-offs | (149) | (148)
Recoveries | 12 | 19
Net charge-offs | (137) | (129)
Balance, ending | 14,969 | 11,777
Reserve to impaired loans | 372 | 498
Reserve to non-impaired loans | 14,597 | 11,279
Reserve for off-balance sheet credit commitments |  | 40
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance, beginning | 9 | 16
Provision/(reversal) for possible loan losses | (2) | 3
Balance, ending | 7 | 19
Reserve to impaired loans | 0 |
Reserve to non-impaired loans | $ 7 | 19
Reserve for off-balance sheet credit commitments |  | $ 1

X
- Definition Amount of direct write-downs of financing receivables charged against the allowance net of recoveries. + 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
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X
- Definition The reserve for off-balance sheet credit commitments. + References No definition available. + Details
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X
- Definition The reserve for impaired loans. + References No definition available. + Details
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X
- Definition The reserve for non-impaired loans. + References No definition available. + Details
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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=66008989&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- 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=66008989&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=66008989&loc=SL6953423-111524 + Details
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