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Note 7 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Commercial Portfolio Segment [Member] |  |  |  |
Balance | $ 50,590 | $ 47,540 | $ 56,199 | $ 47,501
Provision/(credit) for possible credit losses | 4,380 | 10,040 | 5,815 | 11,045
Charge-offs | (3,277) | (3,310) | (12,035) | (6,754)
Recoveries | 2,006 | 607 | 3,720 | 3,085
Net (charge-offs)/recoveries | (1,271) | (2,703) | (8,315) | (3,669)
Balance | 53,699 | 54,877 | 53,699 | 54,877
Reserve for impaired loans | 1,320 | 7,561 | 1,320 | 7,561
Reserve for non-impaired loans | 52,379 | 47,316 | 52,379 | 47,316
Reserve for off-balance sheet credit commitments | 2,112 | 703 | 2,112 | 703
Real Estate Construction Loans [Member] |  |  |  |
Balance | 10,753 | 26,304 |  |
Provision/(credit) for possible credit losses | (2,056) | 121 |  |
Charge-offs |  |  |  |
Recoveries | 548 | 41 |  |
Net (charge-offs)/recoveries | 548 | 41 |  |
Balance | 9,245 | 26,466 | 9,245 | 26,466
Commercial Mortgage Loans [Member] |  |  |  |
Balance | 46,090 | 67,245 |  |
Provision/(credit) for possible credit losses | 3,132 | (11,762) |  |
Charge-offs | (4,626) | (97) |  |
Recoveries | 337 | 647 |  |
Net (charge-offs)/recoveries | (4,289) | 550 |  |
Balance | 44,933 | 56,033 | 44,933 | 56,033
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Balance | 15,503 | 12,323 | 11,145 | 11,578
Provision/(credit) for possible credit losses | (5,452) | 353 | (963) | 1,239
Charge-offs |  |  | (149) | (161)
Recoveries | 6 | 1 | 24 | 21
Net (charge-offs)/recoveries | 6 | 1 | (125) | (140)
Balance | 10,057 | 12,677 | 10,057 | 12,677
Reserve for impaired loans | 375 | 373 | 375 | 373
Reserve for non-impaired loans | 9,682 | 12,304 | 9,682 | 12,304
Reserve for off-balance sheet credit commitments | 80 | 37 | 80 | 37
Installment and Other Loans [Member ] |  |  |  |
Balance | 12 | 25 |  |
Provision/(credit) for possible credit losses | (4) | (2) |  |
Charge-offs |  |  |  |
Recoveries |  |  |  |
Net (charge-offs)/recoveries |  |  |  |
Balance | 8 | 23 | 8 | 23
Real Estate Construction Portfolio Segment [Member] |  |  |  |
Balance |  |  | 22,170 | 27,652
Provision/(credit) for possible credit losses |  |  | (20,796) | (1,349)
Charge-offs |  |  |  |
Recoveries |  |  | 7,871 | 163
Net (charge-offs)/recoveries |  |  | 7,871 | 163
Balance | 9,245 | 26,466 | 9,245 | 26,466
Reserve for impaired loans |  |  |  |
Reserve for non-impaired loans | 9,245 | 26,466 | 9,245 | 26,466
Reserve for off-balance sheet credit commitments |  | 477 |  | 477
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Balance |  |  | 49,440 | 74,673
Provision/(credit) for possible credit losses |  |  | 295 | (19,342)
Charge-offs |  |  | (5,681) | (3,613)
Recoveries |  |  | 879 | 4,315
Net (charge-offs)/recoveries |  |  | (4,802) | 702
Balance | 44,933 | 56,033 | 44,933 | 56,033
Reserve for impaired loans | 1,248 | 6,389 | 1,248 | 6,389
Reserve for non-impaired loans | 43,685 | 49,644 | 43,685 | 49,644
Reserve for off-balance sheet credit commitments | 35 | 202 | 35 | 202
Consumer Portfolio Segment [Member] |  |  |  |
Balance |  |  | 9 | 16
Provision/(credit) for possible credit losses |  |  | (1) | 7
Charge-offs |  |  |  |
Recoveries |  |  |  |
Net (charge-offs)/recoveries |  |  |  |
Balance | 8 | 23 | 8 | 23
Reserve for impaired loans |  |  |  |
Reserve for non-impaired loans | 8 | 23 | 8 | 23
Reserve for off-balance sheet credit commitments | 2 | 1 | 2 | 1
Balance | 122,948 | 153,437 | 138,963 | 161,420
Provision/(credit) for possible credit losses |  | (1,250) | (15,650) | (8,400)
Charge-offs | (7,903) | (3,407) | (17,865) | (10,528)
Recoveries | 2,897 | 1,296 | 12,494 | 7,584
Net (charge-offs)/recoveries | (5,006) | (2,111) | (5,371) | (2,944)
Balance | 117,942 | 150,076 | 117,942 | 150,076
Reserve for impaired loans | 2,943 | 14,323 | 2,943 | 14,323
Reserve for non-impaired loans | 114,999 | 135,753 | 114,999 | 135,753
Reserve for off-balance sheet credit commitments | $ 2,229 | $ 1,420 | $ 2,229 | $ 1,420

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

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- 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 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 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 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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