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Note 23 - Quarterly Results of Operations (Unaudited) (Detail) - Selected Unaudited Quarterly Financial Data (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Interest income | $ 105,281 | $ 106,747 | $ 107,581 | $ 110,135 | $ 111,076 | $ 114,379 | $ 114,339 | $ 113,777 |  |  |
Interest expense | 24,216 | 26,330 | 28,461 | 29,484 | 31,759 | 33,426 | 36,024 | 38,672 | 108,491 | 139,881 | 191,688
Net interest income | 81,065 | 80,417 | 79,120 | 80,651 | 79,317 | 80,953 | 78,315 | 75,105 | 321,253 | 313,690 | 297,906
(Reversal)/provision for credit losses |  |  | (5,000) | (4,000) | 2,000 | 9,000 | 10,000 | 6,000 | (9,000) | 27,000 | 156,900
Net-interest income after provision for loan losses | 81,065 | 80,417 | 84,120 | 84,651 | 77,317 | 71,953 | 68,315 | 69,105 | 330,253 | 286,690 | 141,006
Non-interest income | 12,202 | 15,622 | 9,852 | 8,831 | 8,986 | 16,827 | 12,453 | 12,626 | 46,507 | 50,892 | 32,251
Non-interest expense | 49,532 | 47,844 | 47,342 | 47,871 | 43,990 | 48,383 | 45,410 | 47,783 | 192,589 | 185,566 | 175,711
Income before income tax expense | 43,735 | 48,195 | 46,630 | 45,611 | 42,313 | 40,397 | 35,358 | 33,948 | 184,171 | 152,016 | (2,454)
Income tax expense | 15,276 | 17,686 | 16,619 | 16,547 | 14,459 | 14,162 | 10,906 | 11,734 | 66,128 | 51,261 | (14,629)
Net income | 28,459 | 30,509 | 30,011 | 29,064 | 27,854 | 26,235 | 24,452 | 22,214 | 117,438 | 100,150 | 11,565
Less: net income attributable to noncontrolling interest | 153 | 151 | 150 | 151 | 153 | 151 | 150 | 151 | 605 | 605 | 610
Net income attributable to Cathay General Bancorp | 28,306 | 30,358 | 29,861 | 28,913 | 27,701 | 26,084 | 24,302 | 22,063 | 118,043 | 100,755 | 12,175
Dividends on preferred stock | (4,127) | (4,123) | (4,121) | (4,117) | (4,114) | (4,111) | (4,107) | (4,105) | 16,488 | 16,437 | 16,388
Net income available to common stockholders | $ 24,179 | $ 26,235 | $ 25,740 | $ 24,796 | $ 23,587 | $ 21,973 | $ 20,195 | $ 17,958 | $ 100,950 | $ 83,713 | $ (4,823)
Basic net income attributable to common stockholders per common share (in Dollars per share) | $ 0.31 | $ 0.33 | $ 0.33 | $ 0.32 | $ 0.30 | $ 0.28 | $ 0.26 | $ 0.23 | $ 1.28 | $ 1.06 | $ (0.06)
Diluted net income attributable to commonstockholders per common share (in Dollars per share) | $ 0.31 | $ 0.33 | $ 0.33 | $ 0.32 | $ 0.30 | $ 0.28 | $ 0.26 | $ 0.23 | $ 1.28 | $ 1.06 | $ (0.06)

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