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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities                      
Net income $ 12,208 $ 11,466 $ 12,137 $ 11,181 $ 10,932 $ 12,206 $ 12,335 $ 10,395 $ 46,992 $ 45,868 $ 40,453
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                 24,427 26,079 20,482
Share-based compensation                 1,333 3,131 4,218
Net cash provided by operating activities                 76,485 74,505 71,432
Cash flows from investing activities                      
Distributions from unconsolidated subsidiaries                 645 524 531
Net return of capital from (contributions to) unconsolidated subsidiaries                 (5) 0 466
Net cash used in investing activities                 (277,216) (315,141) (83,135)
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                 941 360 74
Repayments of long-term debt                 0 0 (14)
Repurchases of common stock                 (18,206) (93,533) (142,405)
Dividends paid                 (18,619) (26,143) (13,405)
Net cash provided by financing activities                 204,878 234,823 48,362
Net increase (decrease) in cash and cash equivalents                 4,147 (5,813) 36,659
At beginning of year       80,194       86,007 80,194 86,007 49,348
At end of year 84,341       80,194       84,341 80,194 86,007
Parent                      
Cash flows from operating activities                      
Net income                 46,992 45,868 40,453
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                 15,683 670 (2,520)
Equity in undistributed income (loss) of subsidiary bank                 (20,198) 60,150 116,657
Share-based compensation                 1,045 1,429 4,218
Other, net                 (697) 983 (923)
Net cash provided by operating activities                 42,825 109,100 157,885
Cash flows from investing activities                      
Distributions from unconsolidated subsidiaries                 0 0 479
Net return of capital from (contributions to) unconsolidated subsidiaries                 0 0 518
Net cash used in investing activities                 0 0 997
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                 941 360 74
Repurchases of common stock                 (18,206) (93,533) (142,405)
Dividends paid                 (18,619) (26,143) (13,405)
Net cash provided by financing activities                 (35,884) (119,316) (155,736)
Net increase (decrease) in cash and cash equivalents                 6,941 (10,216) 3,146
At beginning of year       $ 12,559       $ 22,775 12,559 22,775 19,629
At end of year $ 19,500       $ 12,559       $ 19,500 $ 12,559 $ 22,775