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Regulatory Matters (Summary Of The Bancorp's And The Bank's Capital And Leverage Ratios) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Tier I Capital (to risk-weighted assets), Balance $ 1,318,948 $ 1,228,184
Tier I Capital (to risk-weighted assets), Percentage 15.97% 15.37%
Tier I Capital minimum requirement, Balance 330,355 319,607
Tier I Capital minimum requirement, Percentage 4.00% 4.00%
Excess, Balance 988,593 908,577
Excess, Percentage 11.97% 11.37%
Total Capital (to risk-weighted assets), Balance 1,474,496 1,379,758
Total Capital (to risk-weighted assets), Percentage 17.85% 17.27%
Total Capital minimum requirement, Balance 660,710 639,214
Total Capital minimum requirement, Percentage 8.00% 8.00%
Excess Capital 813,786 740,544
Excess, Percentage 9.85% 9.27%
Leverage ratio, Balance 1,318,948 1,228,184
Leverage ratio, Percentage 12.93% 11.44%
Minimum leverage requirement, Balance 408,146 429,254
Minimum leverage requirement, Percentage 4.00% 4.00%
Excess, Balance 910,802 798,930
Excess, Percentage 8.93% 7.44%
Total average assets 10,203,647 [1] 10,731,357 [1]
Risk-weighted assets 8,258,878 7,990,176
Tier 1 capital ratio, minimum 6.00%  
Tier 1 leverage ratio, minimum 5.00%  
Total risk-based capital ratio, minimum 10.00%  
Cathay Bank [Member]
   
Tier I Capital (to risk-weighted assets), Balance 1,289,747 1,182,033
Tier I Capital (to risk-weighted assets), Percentage 15.64% 14.81%
Tier I Capital minimum requirement, Balance 329,928 319,209
Tier I Capital minimum requirement, Percentage 4.00% 4.00%
Excess, Balance 959,819 862,824
Excess, Percentage 11.64% 10.81%
Total Capital (to risk-weighted assets), Balance 1,444,165 1,333,610
Total Capital (to risk-weighted assets), Percentage 17.51% 16.71%
Total Capital minimum requirement, Balance 659,855 638,418
Total Capital minimum requirement, Percentage 8.00% 8.00%
Excess Capital 784,310 695,192
Excess, Percentage 9.51% 8.71%
Leverage ratio, Balance 1,289,747 1,182,033
Leverage ratio, Percentage 12.66% 11.03%
Minimum leverage requirement, Balance 407,643 428,667
Minimum leverage requirement, Percentage 4.00% 4.00%
Excess, Balance 882,104 753,366
Excess, Percentage 8.66% 7.03%
Total average assets 10,191,078 [1] 10,716,672 [1]
Risk-weighted assets $ 8,248,190 $ 7,980,219
[1] Average assets represent average balances for the fourth quarter of each year presented.