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BUSINESS SEGMENTS (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Number of Operating Segments | segment                 2    
Net interest income $ 29,385 $ 28,142 $ 29,243 $ 28,393 $ 28,586 $ 29,992 $ 26,972 $ 25,591 $ 115,163 $ 111,141 $ 96,435
Noninterest income                 44,193 34,627 28,918
Total income                 159,356 145,768 125,353
Provision for loan losses 1,500 500 300 1,250 1,650 400 2,200 1,600 3,550 5,850 7,500
Compensation and benefits                 62,802 53,956 45,003
Premises and equipment expense                 13,497 11,988 11,245
FDIC expense                 2,443 2,366 4,758
Other noninterest expense                 19,344 17,301 14,106
Total noninterest expense                 101,636 91,461 82,612
Income before income tax expense 13,616 14,341 15,742 14,021 13,291 16,462 12,848 11,706 57,720 54,307 42,741
Income tax expense 2,887 3,617 3,832 3,214 2,922 6,256 4,908 3,724 13,550 17,810 16,264
Net income 10,729 $ 10,724 $ 11,910 $ 10,807 10,369 $ 10,206 $ 7,940 $ 7,982 44,170 36,497 26,477
Total assets at period end 4,617,858       4,260,547       4,617,858 4,260,547 3,878,633
Banking [Member]                      
Net interest income                 110,001 105,353 91,334
Noninterest income                 10,013 10,943 10,217
Total income                 120,014 116,296 101,551
Provision for loan losses                 3,550 5,850 7,500
Compensation and benefits                 44,875 42,917 36,028
Premises and equipment expense                 11,747 10,682 10,213
FDIC expense                 2,443 2,366 4,758
Other noninterest expense                 10,267 9,466 8,565
Total noninterest expense                 72,882 71,281 67,064
Income before income tax expense                 47,132 45,015 34,487
Income tax expense                 11,065 14,763 13,123
Net income                 36,067 30,252 21,364
Total assets at period end 4,547,179       4,202,957       4,547,179 4,202,957 3,832,765
Wealth Management Division [Member]                      
Net interest income                 5,162 5,788 5,101
Noninterest income                 34,180 23,684 18,701
Total income                 39,342 29,472 23,802
Provision for loan losses                 0 0 0
Compensation and benefits                 17,927 11,039 8,975
Premises and equipment expense                 1,750 1,306 1,032
FDIC expense                 0 0 0
Other noninterest expense                 9,077 7,835 5,541
Total noninterest expense                 28,754 20,180 15,548
Income before income tax expense                 10,588 9,292 8,254
Income tax expense                 2,485 3,047 3,141
Net income                 8,103 6,245 5,113
Total assets at period end $ 70,679       $ 57,590       $ 70,679 $ 57,590 $ 45,868