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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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities                      
Net income $ 22,327 $ 20,815 $ 18,714 $ 18,038 $ 12,171 $ 6,859 $ 9,917 $ 8,326 $ 79,894 $ 37,273 $ 58,322
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                 10,828 (13,087) (3,965)
Share-based compensation expense                 3,231 3,231 2,735
Net Cash Provided by (Used in) Investing Activities [Abstract]                      
Contributions to subsidiary bank                 0 (46,750) 0
Distributions from unconsolidated entities                 480 330 246
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                 1,236 0 151
Net proceeds from subordinated debt                 0 53,838 0
Proceeds from long-term debt                 0 115,944 20,619
Repurchases of common stock                 (18,669) (4,749) (22,793)
Dividends paid                 (26,959) (25,935) (25,706)
Parent                      
Cash flows from operating activities                      
Net income                 79,894 37,273 58,322
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Deferred income tax benefit                 70 2,552 3,055
Net change in dividends receivable from subsidiary bank                 0 0 21,004
Equity in undistributed loss (income) of subsidiary bank                 (31,465) (15,900) (19,980)
Share-based compensation expense                 3,231 3,231 2,735
Other, net                 (85) (3,010) (2,900)
Net cash provided by operating activities                 51,645 24,146 62,236
Net Cash Provided by (Used in) Investing Activities [Abstract]                      
Distributions from unconsolidated entities                 0 0 622
Net cash provided by (used in) investing activities                 1,653 (46,750) 622
Cash flows from financing activities                      
Net proceeds from issuance of common stock and stock option exercises                 1,236 0 151
Proceeds from long-term debt                 0 0 20,619
Repurchases of common stock                 (18,669) (4,749) (22,793)
Dividends paid                 (26,959) (25,935) (25,706)
Net cash provided by financing activities                 (44,392) 23,154 (68,967)
Net increase (decrease) in cash and cash equivalents                 8,906 550 (6,109)
At beginning of year       $ 11,184       $ 10,634 11,184 10,634  
At end of year $ 20,090       $ 11,184       $ 20,090 $ 11,184 $ 10,634