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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities                      
Net income $ 15,792 $ 15,193 $ 14,224 $ 14,277 $ 4,288 $ 11,812 $ 12,025 $ 13,079 $ 59,486 $ 41,204 $ 46,992
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                 7,874 32,206 24,427
Share-based compensation expense                 2,778 1,918 1,333
Net cash provided by operating activities                 103,486 96,784 76,485
Net Cash Provided by (Used in) Investing Activities [Abstract]                      
Distributions from unconsolidated subsidiaries                 685 0 0
Net cash provided by investing activities                 (211,143) (296,127) (277,216)
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                 0 0 941
Proceeds from long-term debt                 20,619 0 0
Repurchases of common stock                 (32,824) (26,559) (18,206)
Dividends paid                 (24,143) (21,299) (18,619)
Net cash provided by financing activities                 127,550 197,295 204,878
Net increase (decrease) in cash and cash equivalents                 19,893 (2,048) 4,147
At beginning of year       82,293       84,341 82,293 84,341 80,194
At end of year 102,186       82,293       102,186 82,293 84,341
Parent                      
Cash flows from operating activities                      
Net income                 59,486 41,204 46,992
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                 450 (442) 15,683
Dividends receivable from subsidiary bank                 (21,004) 0 0
Equity in undistributed loss (income) of subsidiary bank                 38,986 (1,748) (20,198)
Share-based compensation expense                 2,778 1,918 1,045
Other, net                 (920) 1,357 (697)
Net cash provided by operating activities                 79,776 42,289 42,825
Net Cash Provided by (Used in) Investing Activities [Abstract]                      
Distributions from unconsolidated subsidiaries                 622 0 0
Net cash provided by investing activities                 622 0 0
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                 0 0 941
Proceeds from long-term debt                 20,619 0 0
Repurchases of common stock                 (32,824) (26,559) (18,206)
Dividends paid                 (24,143) (21,299) (18,619)
Net cash provided by financing activities                 (77,586) (47,858) (35,884)
Net increase (decrease) in cash and cash equivalents                 2,812 (5,569) 6,941
At beginning of year       $ 13,931       $ 19,500 13,931 19,500 12,559
At end of year $ 16,743       $ 13,931       $ 16,743 $ 13,931 $ 19,500