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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities                      
Net income $ 4,288 $ 11,812 $ 12,025 $ 13,079 $ 12,208 $ 11,466 $ 12,137 $ 11,181 $ 41,204 $ 46,992 $ 45,868
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                 32,206 24,427 26,079
Share-based compensation expense                 1,918 1,333 3,131
Net cash provided by operating activities                 96,784 76,485 74,505
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                 0 941 360
Repurchases of common stock                 (26,559) (18,206) (93,533)
Dividends paid                 (21,299) (18,619) (26,143)
Net cash provided by financing activities                 197,295 204,878 234,823
Net increase (decrease) in cash and cash equivalents                 (2,048) 4,147 (5,813)
At beginning of year       84,341       80,194 84,341 80,194 86,007
At end of year 82,293       84,341       82,293 84,341 80,194
Parent                      
Cash flows from operating activities                      
Net income                 41,204 46,992 45,868
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                 (442) 15,683 670
Equity in undistributed income (loss) of subsidiary bank                 (1,748) (20,198) 60,150
Share-based compensation expense                 1,918 1,045 1,429
Other, net                 1,357 (697) 983
Net cash provided by operating activities                 42,289 42,825 109,100
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                 0 941 360
Repurchases of common stock                 (26,559) (18,206) (93,533)
Dividends paid                 (21,299) (18,619) (26,143)
Net cash provided by financing activities                 (47,858) (35,884) (119,316)
Net increase (decrease) in cash and cash equivalents                 (5,569) 6,941 (10,216)
At beginning of year       $ 19,500       $ 12,559 19,500 12,559 22,775
At end of year $ 13,931       $ 19,500       $ 13,931 $ 19,500 $ 12,559