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Note 7 - Loans (Details) - Allowance for Loan Losses by Portfolio Segment - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance | $ 156,089 | $ 169,138 | $ 161,420 | $ 173,889
Provision/(reversal) for possible loan losses | (2,150) | (3,700) | (7,150) | (4,071)
Charge-offs | (2,658) | (2,575) | (7,121) | (11,577)
Recoveries | 2,156 | 6,214 | 6,288 | 10,836
Net charge-offs | (502) | 3,639 | (833) | (741)
Balance | 153,437 | 169,077 | 153,437 | 169,077
Reserve to impaired loans | 7,984 | 9,609 | 7,984 | 9,609
Reserve to non-impaired loans | 145,453 | 159,468 | 145,453 | 159,468
Reserve for off-balance sheet credit commitments |  | 1,844 |  | 1,844
Commercial Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance | 49,705 | 64,782 | 47,501 | 65,103
Provision/(reversal) for possible loan losses | 184 | (6,111) | 1,005 | (1,228)
Charge-offs | (2,580) | (114) | (3,444) | (7,340)
Recoveries | 231 | 4,682 | 2,478 | 6,704
Net charge-offs | (2,349) | 4,568 | (966) | (636)
Balance | 47,540 | 63,239 | 47,540 | 63,239
Reserve to impaired loans | 966 | 2,717 | 966 | 2,717
Reserve to non-impaired loans | 46,574 | 60,522 | 46,574 | 60,522
Reserve for off-balance sheet credit commitments |  | 1,014 |  | 1,014
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance | 23,270 | 10,626 | 27,652 | 11,999
Provision/(reversal) for possible loan losses | 2,982 | 742 | (1,470) | (656)
Charge-offs |  | (1,813) |  | (1,813)
Recoveries | 52 |  | 122 | 25
Net charge-offs | 52 | (1,813) | 122 | (1,788)
Balance | 26,304 | 9,555 | 26,304 | 9,555
Reserve to impaired loans |  | 143 |  | 143
Reserve to non-impaired loans | 26,304 | 9,412 | 26,304 | 9,412
Reserve for off-balance sheet credit commitments |  | 391 |  | 391
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance | 71,318 | 81,326 | 74,673 | 84,753
Provision/(reversal) for possible loan losses | (5,880) | 1,185 | (7,580) | (3,041)
Charge-offs | (65) | (648) | (3,516) | (2,424)
Recoveries | 1,872 | 1,532 | 3,668 | 4,107
Net charge-offs | 1,807 | 884 | 152 | 1,683
Balance | 67,245 | 83,395 | 67,245 | 83,395
Reserve to impaired loans | 6,554 | 6,230 | 6,554 | 6,230
Reserve to non-impaired loans | 60,691 | 77,165 | 60,691 | 77,165
Reserve for off-balance sheet credit commitments |  | 401 |  | 401
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance | 11,777 | 12,377 | 11,578 | 12,005
Provision/(reversal) for possible loan losses | 559 | 493 | 886 | 865
Charge-offs | (13) |  | (161) |
Recoveries |  |  | 20 |
Net charge-offs | (13) |  | (141) |
Balance | 12,323 | 12,870 | 12,323 | 12,870
Reserve to impaired loans | 464 | 519 | 464 | 519
Reserve to non-impaired loans | 11,859 | 12,351 | 11,859 | 12,351
Reserve for off-balance sheet credit commitments |  | 36 |  | 36
Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Balance | 19 | 27 | 16 | 29
Provision/(reversal) for possible loan losses | 5 | (9) | 9 | (11)
Recoveries | 1 |  |  |
Net charge-offs | 1 |  |  |
Balance | 25 | 18 | 25 | 18
Reserve to impaired loans | 0 |  | 0 |
Reserve to non-impaired loans | $ 25 | 18 | $ 25 | 18
Reserve for off-balance sheet credit commitments |  | $ 2 |  | $ 2

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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- Definition The reserve for off-balance sheet credit commitments. + References No definition available. + Details
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- Definition The reserve for 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=49124121&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=49124121&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=49124121&loc=SL6953423-111524 + Details
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