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LOANS - Summary of Total Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,562,885	$ 2,634,593
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,964,754	1,828,731
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	598,131	805,862
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,525,450	1,353,952
Total commercial loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,266,348	1,024,008
Total commercial loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	259,102	329,944
Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,084,381	930,661
Total commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	895,117	697,438
Total commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	189,264	233,223
Total commercial real estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	131,123	34,290
Total commercial real estate | Construction and land development | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	129,255	31,387
Total commercial real estate | Construction and land development | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,868	2,903
Total commercial real estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	953,258	896,371
Total commercial real estate | Other commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	765,862	666,051
Total commercial real estate | Other commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	187,396	230,320
Total commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	441,069	423,291
Total commercial and industrial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	371,231	326,570
Total commercial and industrial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	69,838	96,721
Total commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	360,688	298,764
Total commercial and industrial | Commercial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	315,005	239,692
Total commercial and industrial | Commercial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	45,683	59,072
Total commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	16,950	20,224
Total commercial and industrial | Agricultural | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	16,797	20,018
Total commercial and industrial | Agricultural | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	153	206
Total commercial and industrial | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	63,431	104,303
Total commercial and industrial | Tax exempt | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	39,429	66,860
Total commercial and industrial | Tax exempt | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	24,002	37,443
Total residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 923,891	1,145,358
Total residential real estate | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of families | item	4
Total residential real estate | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of families | item	1
Total residential real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 633,390	734,188
Total residential real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	290,501	411,170
Total residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	923,891	1,145,358
Total residential real estate | Residential mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	633,390	734,188
Total residential real estate | Residential mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	290,501	411,170
Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	113,544	135,283
Total consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	65,016	70,535
Total consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	48,528	64,748
Total consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	102,464	122,401
Total consumer | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	55,092	59,368
Total consumer | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	47,372	63,033
Total consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,080	12,882
Total consumer | Other consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	9,924	11,167
Total consumer | Other consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,156	$ 1,715

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

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