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Note 24 - Quarterly Results of Operations (Unaudited) (Details) - Selected Unaudited Quarterly Financial Data (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Selected Unaudited Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 101,621 | $ 102,462 | $ 100,862 | $ 102,051 | $ 105,281 | $ 106,747 | $ 107,581 | $ 110,135 |  |  |
Interest expense | 19,659 | 19,854 | 20,868 | 21,919 | 24,216 | 26,330 | 28,461 | 29,484 | 82,300 | 108,491 | 139,881
Net interest income | 81,962 | 82,608 | 79,994 | 80,132 | 81,065 | 80,417 | 79,120 | 80,651 | 324,696 | 321,253 | 313,690
Reversal for credit losses |  | (3,000) |  |  |  |  | (5,000) | (4,000) | (3,000) | (9,000) | 27,000
Net-interest income after provision for loan losses | 81,962 | 85,608 | 79,994 | 80,132 | 81,065 | 80,417 | 84,120 | 84,651 | 327,696 | 330,253 | 286,690
Non-interest income | 8,345 | 16,720 | 20,361 | 14,881 | 12,202 | 15,622 | 9,852 | 8,831 | 60,307 | 46,507 | 50,892
Non-interest expense | 40,319 | 50,670 | 53,716 | 49,128 | 49,532 | 47,844 | 47,342 | 47,871 | 193,833 | 192,589 | 185,566
Income before income tax expense | 49,988 | 51,658 | 46,639 | 45,885 | 43,735 | 48,195 | 46,630 | 45,611 | 194,170 | 184,171 | 152,016
Income tax expense | 17,946 | 19,029 | 16,573 | 16,887 | 15,276 | 17,686 | 16,619 | 16,547 | 70,435 | 66,128 | 51,261
Net income | 32,042 | 32,629 | 30,066 | 28,998 | 28,459 | 30,509 | 30,011 | 29,064 | 123,143 | 117,438 | 100,150
Less: net income attributable to noncontrolling interest | 140 | 151 | 150 | 151 | 153 | 151 | 150 | 151 | 592 | 605 | 605
Net income attributable to Cathay General Bancorp | 31,902 | 32,478 | 29,916 | 28,847 | 28,306 | 30,358 | 29,861 | 28,913 | 123,735 | 118,043 | 100,755
Dividends on preferred stock |  | (2,434) | (2,067) | (5,184) | (4,127) | (4,123) | (4,121) | (4,117) | 9,685 | 16,488 | 16,437
Net income available to common stockholders | $ 31,902 | $ 30,044 | $ 27,849 | $ 23,663 | $ 24,179 | $ 26,235 | $ 25,740 | $ 24,796 | $ 113,458 | $ 100,950 | $ 83,713
Basic net income attributable to common stockholders per common share (in Dollars per share) | $ 0.40 | $ 0.38 | $ 0.35 | $ 0.30 | $ 0.31 | $ 0.33 | $ 0.33 | $ 0.32 | $ 1.44 | $ 1.28 | $ 1.06
Diluted net income attributable to common stockholders per common share (in Dollars per share) | $ 0.40 | $ 0.38 | $ 0.35 | $ 0.30 | $ 0.31 | $ 0.33 | $ 0.33 | $ 0.32 | $ 1.43 | $ 1.28 | $ 1.06

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