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UNAUDITED QUARTERLY FINANCIAL INFORMATION (Details) (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
UNAUDITED QUARTERLY FINANCIAL INFORMATION |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 37,133 | $ 35,558 | $ 34,992 | $ 32,595 | $ 31,389 | $ 31,674 | $ 32,479 | $ 32,903 | $ 140,278 | $ 128,445 | $ 136,450
Total interest expense | 1,637 | 1,787 | 1,819 | 1,926 | 1,999 | 2,114 | 2,220 | 2,401 | 7,169 | 8,734 | 18,629
Net interest income | 35,496 | 33,771 | 33,173 | 30,669 | 29,390 | 29,560 | 30,259 | 30,502 | 133,109 | 119,711 | 117,821
Provision (credit) for loan and lease losses | (1,333) | (3,189) | (227) | (6,561) | (2,283) | (4,982) | (6,630) | (4,990) | (11,310) | (18,885) | (40,690)
Net interest income after provision for loan and lease losses | 36,829 | 36,960 | 33,400 | 37,230 | 31,673 | 34,542 | 36,889 | 35,492 | 144,419 | 138,596 | 158,511
Investment securities gains | 482 |  |  |  |  | 789 |  |  | 482 | 789 | 1,306
Income before income taxes | 13,731 | 12,378 | 16,212 | 17,507 | 12,410 | 10,721 | 10,812 | 13,478 | 59,828 | 47,421 | 36,571
Net income | $ 10,295 | $ 10,204 | $ 14,267 | $ 137,309 | $ 12,410 | $ 10,721 | $ 10,812 | $ 13,478 | $ 172,075 | $ 47,421 | $ 36,571
Basic earnings per share (in dollars per share) | $ 0.24 | $ 0.24 | $ 0.34 | $ 3.28 | $ 0.30 | $ 0.26 | $ 0.26 | $ 0.32 | $ 4.10 | $ 1.14 | $ 3.36
Diluted earnings per share (in dollars per share) | $ 0.24 | $ 0.24 | $ 0.34 | $ 3.25 | $ 0.29 | $ 0.26 | $ 0.26 | $ 0.32 | $ 4.07 | $ 1.13 | $ 3.31

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1, 2 , 3, 4, 5 -Article 9 + Details
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