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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Past Due Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 15,728 | $ 21,403
Current | 2,535,336 | 2,541,482
Total loans | 2,551,064 | 2,562,885
Past Due More Than 90 days and Accruing | 189 | 267
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 9,236 | 12,307
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,722 | 4,263
90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,770 | 4,833
Total commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans |  | 1,084,381
Total commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans |  | 441,069
Commercial construction | Total commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due |  | 75
Current | 117,464 | 117,807
Total loans | 117,464 | 117,882
Commercial construction | Total commercial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due |  | 74
Commercial construction | Total commercial loans | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due |  | 1
Commercial real estate owner occupied | Total commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 341 | 2,211
Current | 233,506 | 217,006
Total loans | 233,847 | 219,217
Commercial real estate owner occupied | Total commercial real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 10 | 1,309
Commercial real estate owner occupied | Total commercial real estate | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due |  | 464
Commercial real estate owner occupied | Total commercial real estate | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 331 | 438
Commercial real estate non-owner occupied | Total commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,140 | 1,801
Current | 732,367 | 714,975
Total loans | 733,507 | 716,776
Past Due More Than 90 days and Accruing | 50 |
Commercial real estate non-owner occupied | Total commercial real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 644 | 503
Commercial real estate non-owner occupied | Total commercial real estate | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 179 | 674
Commercial real estate non-owner occupied | Total commercial real estate | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 317 | 624
Tax exempt |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 46,541 | 47,862
Total loans | 46,541 | 47,862
Commercial and industrial | Total commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 763 | 354
Current | 375,632 | 355,330
Total loans | 376,395 | 355,684
Past Due More Than 90 days and Accruing | 15 |
Commercial and industrial | Total commercial and industrial | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 364 | 161
Commercial and industrial | Total commercial and industrial | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 399 | 193
Residential mortgages | Total residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 12,354 | 14,889
Current | 927,773 | 980,327
Total loans | 940,127 | 995,216
Past Due More Than 90 days and Accruing | 24 |
Residential mortgages | Total residential real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 7,815 | 9,178
Residential mortgages | Total residential real estate | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,345 | 2,511
Residential mortgages | Total residential real estate | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,194 | 3,200
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,026 | 2,051
Current | 92,599 | 98,045
Total loans | 93,625 | 100,096
Past Due More Than 90 days and Accruing |  | 267
Home equity | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 399 | 1,062
Home equity | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 198 | 614
Home equity | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 429 | 375
Consumer other | Total consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 104 | 22
Current | 9,454 | 10,130
Total loans | 9,558 | 10,152
Past Due More Than 90 days and Accruing | 100 |
Consumer other | Total consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4 | 20
Consumer other | Total consumer | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 100 | $ 2

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