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Note 8 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
June 30, 2017 Ending Balance | $ 115,809 | $ 122,948 | $ 118,966 | $ 138,963
Provision/(credit) for possible credit losses |  |  | (2,500) | (15,650)
Charge-offs | (385) | (7,903) | (2,670) | (17,865)
Recoveries | 6,111 | 2,897 | 7,739 | 12,494
Net (charge-offs)/recoveries | 5,726 | (5,006) | 5,069 | (5,371)
September 30, 2017 Ending Balance | 121,535 | 117,942 | 121,535 | 117,942
Reserve for impaired loans | 2,606 | 2,943 | 2,606 | 2,943
Reserve for non-impaired loans | 118,929 | 114,999 | 118,929 | 114,999
Reserve for off-balance sheet credit commitments | 4,254 | 2,229 | 4,254 | 2,229
Commercial Portfolio Segment [Member] |  |  |  |
June 30, 2017 Ending Balance | 46,744 | 50,590 | 49,203 | 56,199
Provision/(credit) for possible credit losses | 3,800 | 4,380 | 2,245 | 5,815
Charge-offs | (80) | (3,277) | (1,810) | (12,035)
Recoveries | 575 | 2,006 | 1,401 | 3,720
Net (charge-offs)/recoveries | 495 | (1,271) | (409) | (8,315)
September 30, 2017 Ending Balance | 51,039 | 53,699 | 51,039 | 53,699
Reserve for impaired loans | 1,461 | 1,320 | 1,461 | 1,320
Reserve for non-impaired loans | 49,578 | 52,379 | 49,578 | 52,379
Reserve for off-balance sheet credit commitments | 2,760 | 2,112 | 2,760 | 2,112
Real Estate Construction Portfolio Segment [Member] |  |  |  |
June 30, 2017 Ending Balance | 17,844 | 10,753 | 23,268 | 22,170
Provision/(credit) for possible credit losses | 4,117 | (2,056) | (1,403) | (20,796)
Charge-offs |  |  |  |
Recoveries | 47 | 548 | 143 | 7,871
Net (charge-offs)/recoveries | 47 | 548 | 143 | 7,871
September 30, 2017 Ending Balance | 22,008 | 9,245 | 22,008 | 9,245
Reserve for impaired loans |  |  |  |
Reserve for non-impaired loans | 22,008 | 9,245 | 22,008 | 9,245
Reserve for off-balance sheet credit commitments | 1,206 |  | 1,206 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
June 30, 2017 Ending Balance | 36,840 | 46,090 | 34,864 | 49,440
Provision/(credit) for possible credit losses | (4,615) | 3,132 | (2,775) | 295
Charge-offs | (305) | (4,626) | (860) | (5,681)
Recoveries | 5,482 | 337 | 6,173 | 879
Net (charge-offs)/recoveries | 5,177 | (4,289) | 5,313 | (4,802)
September 30, 2017 Ending Balance | 37,402 | 44,933 | 37,402 | 44,933
Reserve for impaired loans | 823 | 1,248 | 823 | 1,248
Reserve for non-impaired loans | 36,579 | 43,685 | 36,579 | 43,685
Reserve for off-balance sheet credit commitments | 109 | 35 | 109 | 35
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
June 30, 2017 Ending Balance | 14,364 | 15,503 | 11,620 | 11,145
Provision/(credit) for possible credit losses | (3,309) | (5,452) | (580) | (963)
Charge-offs |  |  |  | (149)
Recoveries | 7 | 6 | 22 | 24
Net (charge-offs)/recoveries | 7 | 6 | 22 | (125)
September 30, 2017 Ending Balance | 11,062 | 10,057 | 11,062 | 10,057
Reserve for impaired loans | 322 | 375 | 322 | 375
Reserve for non-impaired loans | 10,740 | 9,682 | 10,740 | 9,682
Reserve for off-balance sheet credit commitments | 175 | 80 | 175 | 80
Installment and Other Loans [Member ] |  |  |  |
June 30, 2017 Ending Balance | 17 | 12 | 11 | 9
Provision/(credit) for possible credit losses | 7 | (4) | 13 | (1)
Charge-offs |  |  |  |
Recoveries |  |  |  |
Net (charge-offs)/recoveries |  |  |  |
September 30, 2017 Ending Balance | 24 | 8 | 24 | 8
Reserve for impaired loans |  |  |  |
Reserve for non-impaired loans | 24 | 8 | 24 | 8
Reserve for off-balance sheet credit commitments | $ 4 | $ 2 | $ 4 | $ 2

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- 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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- 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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Balance Type: | credit
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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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