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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 2,641,092	$ 2,490,227
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,835,230	1,630,897
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	805,862	859,330
Commercial real estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	930,661	826,699
Commercial real estate: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	697,438	579,734
Commercial real estate: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	233,223	246,965
Commercial real estate: | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	34,290	26,644
Commercial real estate: | Construction and land development | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	31,387	23,754
Commercial real estate: | Construction and land development | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	2,903	2,890
Commercial real estate: | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	896,371	800,055
Commercial real estate: | Other commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	666,051	555,980
Commercial real estate: | Other commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	230,320	244,075
Commercial and industrial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	423,291	404,870
Commercial and industrial: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	326,570	313,662
Commercial and industrial: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	96,721	91,208
Commercial and industrial: | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	298,764	287,227
Commercial and industrial: | Commercial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	239,692	234,757
Commercial and industrial: | Commercial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	59,072	52,470
Commercial and industrial: | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	20,224	22,317
Commercial and industrial: | Agricultural | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	20,018	22,317
Commercial and industrial: | Agricultural | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	206	0
Commercial and industrial: | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	104,303	95,326
Commercial and industrial: | Tax exempt | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	66,860	56,588
Commercial and industrial: | Tax exempt | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	37,443	38,738
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,353,952	1,231,569
Total commercial loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,024,008	893,396
Total commercial loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	329,944	338,173
Residential real estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,151,857	1,144,698
Residential real estate: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	740,687	670,189
Residential real estate: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	411,170	474,509
Residential real estate: | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,151,857	1,144,698
Residential real estate: | Residential mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	740,687	670,189
Residential real estate: | Residential mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	411,170	474,509
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	135,283	113,960
Consumer: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	70,535	67,312
Consumer: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	64,748	46,648
Consumer: | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	122,401	103,189
Consumer: | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	59,368	57,898
Consumer: | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	63,033	45,291
Consumer: | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	12,882	10,771
Consumer: | Other consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	11,167	9,414
Consumer: | Other consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 1,715	$ 1,357

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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=118952595&loc=d3e4428-111522

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