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Note 22 - Regulatory Matters (Details) - Capital and Leverage Ratios (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Company [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier I Capital (to risk- weighted assets) $ 1,406,511us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= caty_CompanyMember
$ 1,288,892us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= caty_CompanyMember
Tier I Capital (to risk- weighted assets) 14.96%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
15.04%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
Tier I Capital minimum requirement 376,072us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= caty_CompanyMember
342,899us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= caty_CompanyMember
Tier I Capital minimum requirement 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
Excess 1,030,439us-gaap_ExcessTierOneRiskBasedCapital
/ dei_LegalEntityAxis
= caty_CompanyMember
945,993us-gaap_ExcessTierOneRiskBasedCapital
/ dei_LegalEntityAxis
= caty_CompanyMember
Excess 10.96%us-gaap_ExcessTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
11.04%us-gaap_ExcessTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
Total Capital (to risk- weighted assets) 1,524,702us-gaap_Capital
/ dei_LegalEntityAxis
= caty_CompanyMember
1,401,319us-gaap_Capital
/ dei_LegalEntityAxis
= caty_CompanyMember
Total Capital (to risk- weighted assets) 16.22%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
16.35%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
Total Capital minimum requirement 752,144us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= caty_CompanyMember
685,799us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= caty_CompanyMember
Total Capital minimum requirement 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
Excess 772,558us-gaap_ExcessCapital
/ dei_LegalEntityAxis
= caty_CompanyMember
715,520us-gaap_ExcessCapital
/ dei_LegalEntityAxis
= caty_CompanyMember
Excess 8.22%us-gaap_ExcessCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
8.35%us-gaap_ExcessCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
Tier I Capital (to average assets) Leverage ratio 1,406,511us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= caty_CompanyMember
1,288,892us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= caty_CompanyMember
Tier I Capital (to average assets) Leverage ratio 12.99%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
12.48%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
Minimum leverage requirement 433,121us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= caty_CompanyMember
413,158us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= caty_CompanyMember
Minimum leverage requirement 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
Excess 973,390us-gaap_ExcessTierOneLeverageCapital
/ dei_LegalEntityAxis
= caty_CompanyMember
875,734us-gaap_ExcessTierOneLeverageCapital
/ dei_LegalEntityAxis
= caty_CompanyMember
Excess 8.99%us-gaap_ExcessTierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
8.48%us-gaap_ExcessTierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
Total average assets (1) 10,828,015caty_AverageAssetsTotal
/ dei_LegalEntityAxis
= caty_CompanyMember
[1] 10,328,952caty_AverageAssetsTotal
/ dei_LegalEntityAxis
= caty_CompanyMember
[1]
Risk-weighted assets 9,401,803us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
8,572,487us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= caty_CompanyMember
Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier I Capital (to risk- weighted assets) 1,353,481us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= caty_BankMember
1,244,480us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= caty_BankMember
Tier I Capital (to risk- weighted assets) 14.42%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
14.53%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
Tier I Capital minimum requirement 375,318us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= caty_BankMember
342,701us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= caty_BankMember
Tier I Capital minimum requirement 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
Excess 978,163us-gaap_ExcessTierOneRiskBasedCapital
/ dei_LegalEntityAxis
= caty_BankMember
901,779us-gaap_ExcessTierOneRiskBasedCapital
/ dei_LegalEntityAxis
= caty_BankMember
Excess 10.42%us-gaap_ExcessTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
10.53%us-gaap_ExcessTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
Total Capital (to risk- weighted assets) 1,471,337us-gaap_Capital
/ dei_LegalEntityAxis
= caty_BankMember
1,352,415us-gaap_Capital
/ dei_LegalEntityAxis
= caty_BankMember
Total Capital (to risk- weighted assets) 15.68%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
15.79%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
Total Capital minimum requirement 750,637us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= caty_BankMember
685,402us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= caty_BankMember
Total Capital minimum requirement 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
Excess 720,700us-gaap_ExcessCapital
/ dei_LegalEntityAxis
= caty_BankMember
667,013us-gaap_ExcessCapital
/ dei_LegalEntityAxis
= caty_BankMember
Excess 7.68%us-gaap_ExcessCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
7.79%us-gaap_ExcessCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
Tier I Capital (to average assets) Leverage ratio 1,353,481us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= caty_BankMember
1,244,480us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= caty_BankMember
Tier I Capital (to average assets) Leverage ratio 12.52%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= caty_BankMember
12.06%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= caty_BankMember
Minimum leverage requirement 432,350us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= caty_BankMember
412,815us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= caty_BankMember
Minimum leverage requirement 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= caty_BankMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= caty_BankMember
Excess 921,131us-gaap_ExcessTierOneLeverageCapital
/ dei_LegalEntityAxis
= caty_BankMember
831,665us-gaap_ExcessTierOneLeverageCapital
/ dei_LegalEntityAxis
= caty_BankMember
Excess 8.52%us-gaap_ExcessTierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= caty_BankMember
8.06%us-gaap_ExcessTierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= caty_BankMember
Total average assets (1) 10,808,747caty_AverageAssetsTotal
/ dei_LegalEntityAxis
= caty_BankMember
[1] 10,320,368caty_AverageAssetsTotal
/ dei_LegalEntityAxis
= caty_BankMember
[1]
Risk-weighted assets $ 9,382,961us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
$ 8,567,523us-gaap_RiskWeightedAssets
/ dei_LegalEntityAxis
= caty_BankMember
[1] Average assets represent average balances for the fourth quarter of each year presented.