XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Note 6 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities available-for-sale, gross unrealized gains | $ 10,444 | $ 12,301 |
Securities available-for-sale, gross unrealized losses | 8,717 | 14,968 |
Securities available-for-sale | 1,368,351 | 1,314,345 | [1]
Securities available-for-sale, amortized cost | 1,366,624 | 1,317,012 |
US Treasury Securities [Member] |  |  |
Securities available-for-sale, gross unrealized gains |  | 35 |
Securities available-for-sale, gross unrealized losses | 524 | 857 |
Securities available-for-sale | 569,045 | 489,017 |
Securities available-for-sale, amortized cost | 569,569 | 489,839 |
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Securities available-for-sale, gross unrealized gains |  |  |
Securities available-for-sale, gross unrealized losses | 5,369 | 9,669 |
Securities available-for-sale | 394,631 | 390,331 |
Securities available-for-sale, amortized cost | 400,000 | 400,000 |
Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available-for-sale, gross unrealized gains | 221 | 309 |
Securities available-for-sale, gross unrealized losses | 2,480 | 3,290 |
Securities available-for-sale | 306,907 | 336,260 |
Securities available-for-sale, amortized cost | 309,166 | 339,241 |
Corporate Debt Securities [Member] |  |  |
Securities available-for-sale, gross unrealized gains | 549 | 247 |
Securities available-for-sale, gross unrealized losses | 109 | 862 |
Securities available-for-sale | 75,410 | 74,350 |
Securities available-for-sale, amortized cost | 74,970 | 74,965 |
Collateralized Mortgage Obligations [Member] |  |  |
Securities available-for-sale, gross unrealized gains |  |  |
Securities available-for-sale, gross unrealized losses |  | 20 |
Securities available-for-sale |  | 28 |
Securities available-for-sale, amortized cost |  | 48 |
Mutual Funds [Member] |  |  |
Securities available-for-sale, gross unrealized gains |  |  |
Securities available-for-sale, gross unrealized losses | 235 | 270 |
Securities available-for-sale | 6,265 | 6,230 |
Securities available-for-sale, amortized cost | 6,500 | 6,500 |
Preferred Stock of Government Sponsored Entities [Member] |  |  |
Securities available-for-sale, gross unrealized gains | 2,413 | 4,497 |
Securities available-for-sale, gross unrealized losses |  |  |
Securities available-for-sale | 5,224 | 7,308 | [2]
Securities available-for-sale, amortized cost | 2,811 | 2,811 |
Other Equity Securities [Member] |  |  |
Securities available-for-sale, gross unrealized gains | 7,261 | 7,213 |
Securities available-for-sale, gross unrealized losses |  |  |
Securities available-for-sale | 10,869 | 10,821 | [2]
Securities available-for-sale, amortized cost | $ 3,608 | $ 3,608 |
[1] | Preferred stock of government sponsored entities and other equity securities as of December 31, 2015 were reclassified as level 1 rather than level 2 as originally classified due to the availability of quoted prices in active markets.
[2] | Preferred stock of government sponsored entities and other equity securities as of December 31, 2015 were reclassified as level 1 rather than level 2 as originally classified due to the availability of quoted prices in active markets.

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CollateralizedMortgageObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=caty_MutualFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=caty_PreferredStockOfGovernmentSponsoredEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=caty_OtherEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |