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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, 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
UNAUDITED QUARTERLY FINANCIAL INFORMATION                      
Total interest income $ 31,389 $ 31,674 $ 32,479 $ 32,903 $ 33,573 $ 34,330 $ 34,184 $ 34,363 $ 128,445 $ 136,450 $ 160,754
Total interest expense 1,999 2,114 2,220 2,401 2,761 4,501 5,205 6,162 8,734 18,629 42,101
Net interest income 29,390 29,560 30,259 30,502 30,812 29,829 28,979 28,201 119,711 117,821 118,653
Credit for loan and lease losses (2,283) (4,982) (6,630) (4,990) (11,215) (19,116) (8,784) (1,575) (18,885) (40,690) 159,548
Net interest income (loss) after provision for loan and lease losses 31,673 34,542 36,889 35,492 42,027 48,945 37,763 29,776 138,596 158,511 (40,895)
Investment securities gains   789     1,045   261   789 1,306 831
Income before income taxes 12,410 10,721 10,812 13,478 12,095 11,626 8,211 4,639 47,421 36,571 (250,953)
Net income (loss) $ 12,410 $ 10,721 $ 10,812 $ 13,478 $ 12,095 $ 11,626 $ 8,211 $ 4,639 $ 47,421 $ 36,571 $ (250,953)
Basic earnings per share (in dollars per share) $ 0.30 $ 0.26 $ 0.26 $ 0.32 $ 0.29 $ 0.28 $ 0.20 $ 4.59 $ 1.14 $ 3.36 $ (171.13)
Diluted earnings per share (in dollars per share) $ 0.29 $ 0.26 $ 0.26 $ 0.32 $ 0.29 $ 0.28 $ 0.20 $ 4.58 $ 1.13 $ 3.31 $ (171.13)