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REVENUE (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Non-interest income (in-scope of Topic 606)                 $ 49,698 $ 48,653 $ 44,954
Non-interest income (out-of-scope of Topic 606)                 34,304 25,671 29,290
Total non-interest income $ 23,362 $ 21,406 $ 17,512 $ 21,722 $ 15,775 $ 20,034 $ 19,623 $ 18,892 84,002 74,324 74,244
Service charges on deposit accounts                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Non-interest income (in-scope of Topic 606)                 23,122 21,046 17,591
Insurance commissions and fees                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Non-interest income (in-scope of Topic 606)                 10,957 10,983 10,589
Total non-interest income                 10,957 10,983 10,589
Wealth management fees                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Non-interest income (in-scope of Topic 606)                 9,353 9,447 9,395
Total non-interest income                 9,353 9,447 9,395
Interchange income                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Non-interest income (in-scope of Topic 606)                 $ 6,266 $ 7,177 $ 7,379