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PARENT COMPANY AND REGULATORY RESTRICTIONS (Details 5) (USD $)
In Thousands, 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
Cash flows from operating activities                      
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)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:                      
Share-based compensation                 3,982 3,277 233
Net cash provided by operating activities                 39,388 23,123 221,433
Cash flows from investing activities                      
Proceeds from sales of investment securities available for sale   124,700             130,076 137,980 439,403
Net cash provided by (used in) investing activities                 (306,278) (687,244) 755,626
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                   323,538 (1,023)
Other, net                     147
Net cash provided by (used in) financing activities                 187,193 130,454 (674,687)
Net increase (decrease) in cash and cash equivalents                 (79,697) (533,667) 302,372
At beginning of year       257,072       790,739 257,072 790,739 488,367
At end of year 177,375       257,072       177,375 257,072 790,739
Parent company
                      
Cash flows from operating activities                      
Net income (loss)                 47,421 36,571 (250,953)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                     (73)
Equity in (income) loss of subsidiary banks                 (54,124) (42,377) 241,720
Equity in undistributed income of other subsidiaries                 (8) (14)  
Share-based compensation                 90 153 56
Other, net                 7,681 4,755 8,904
Net cash provided by operating activities                 1,060 (912) (346)
Cash flows from investing activities                      
Proceeds from sales of investment securities available for sale                     335
Investment in subsidiary bank                   (283,000)  
Net cash provided by (used in) investing activities                   (283,000) 335
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                   323,538 (1,023)
Other, net                     147
Net cash provided by (used in) financing activities                   323,538 (876)
Net increase (decrease) in cash and cash equivalents                 1,060 39,626 (887)
At beginning of year       45,626       6,000 45,626 6,000 6,887
At end of year $ 46,686       $ 45,626       $ 46,686 $ 45,626 $ 6,000