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PARENT COMPANY AND REGULATORY RESTRICTIONS (Condensed Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities                      
Net income $ 10,932 $ 12,206 $ 12,335 $ 10,395 $ 13,265 $ 8,230 $ 9,150 $ 9,808 $ 45,868 $ 40,453 $ 172,075
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                 26,079 20,482 (112,138)
Share-based compensation                 3,131 4,218 4,931
Net cash provided by operating activities                 74,505 71,432 84,531
Cash flows from investing activities                      
Distributions from unconsolidated subsidiaries                 524 531 9,615
Net return of capital from (contributions to) unconsolidated subsidiaries                 0 466 (9,050)
Net cash used in investing activities                 (315,141) (83,135) (442,050)
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                 360 74 74
Repayments of long-term debt                 0 (14) (15,482)
Repurchases of common stock                 (93,533) (142,405) 0
Dividends paid                 (26,143) (13,405) (6,735)
Net cash provided by financing activities                 234,823 48,362 229,492
Net increase (decrease) in cash and cash equivalents                 (5,813) 36,659 (128,027)
At beginning of year       86,007       49,348 86,007 49,348 177,375
At end of year 80,194       86,007       80,194 86,007 49,348
Parent                      
Cash flows from operating activities                      
Net income                 45,868 40,453 172,075
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                 670 (2,520) (25,707)
Equity in undistributed income (loss) of subsidiary bank                 60,150 116,657 (143,945)
Equity in undistributed income of other subsidiaries                 0 0 (5)
Share-based compensation                 1,429 4,218 4,931
Accrued interest payable                 0 0 (11,919)
Other, net                 983 (923) (362)
Net cash provided by operating activities                 109,100 157,885 (4,932)
Cash flows from investing activities                      
Distributions from unconsolidated subsidiaries                 0 479 9,000
Net return of capital from (contributions to) unconsolidated subsidiaries                 0 518 (9,000)
Net cash used in investing activities                 0 997 0
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                 360 74 74
Repayments of long-term debt                 0 0 (15,464)
Repurchases of common stock                 (93,533) (142,405) 0
Dividends paid                 (26,143) (13,405) (6,735)
Net cash provided by financing activities                 (119,316) (155,736) (22,125)
Net increase (decrease) in cash and cash equivalents                 (10,216) 3,146 (27,057)
At beginning of year       $ 22,775       $ 19,629 22,775 19,629 46,686
At end of year $ 12,559       $ 22,775       $ 12,559 $ 22,775 $ 19,629