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LOANS - Summary of Total Loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 2,634,983	$ 2,641,092
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,908,558	1,835,230
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	726,425	805,862
Acquired Loans | Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	15,200
Total note balance	19,300
Acquired Loans | Financial Asset Acquired and No Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	711,200
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,374,535	1,353,952
Total commercial loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,092,108	1,024,008
Total commercial loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	282,427	329,944
Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	948,178	930,661
Total commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	729,735	697,438
Total commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	218,443	233,223
Total commercial real estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	51,579	34,290
Total commercial real estate | Construction and land development | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	49,157	31,387
Total commercial real estate | Construction and land development | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,422	2,903
Total commercial real estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	896,599	896,371
Total commercial real estate | Other commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	680,578	666,051
Total commercial real estate | Other commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	216,021	230,320
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	426,357	423,291
Commercial and industrial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	362,373	326,570
Commercial and industrial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	63,984	96,721
Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	340,795	298,764
Commercial and industrial | Commercial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	288,082	239,692
Commercial and industrial | Commercial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	52,713	59,072
Commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,797	20,224
Commercial and industrial | Agricultural | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,597	20,018
Commercial and industrial | Agricultural | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	200	206
Commercial and industrial | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	66,765	104,303
Commercial and industrial | Tax exempt | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	55,694	66,860
Commercial and industrial | Tax exempt | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,071	37,443
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,132,328	1,151,857
Residential real estate | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of families | item	4
Residential real estate | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of families | item	1
Residential real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 742,710	740,687
Residential real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	389,618	411,170
Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,132,328	1,151,857
Residential real estate | Residential mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	742,710	740,687
Residential real estate | Residential mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	389,618	411,170
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	128,120	135,283
Consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	73,740	70,535
Consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	54,380	64,748
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	117,544	122,401
Consumer | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	64,514	59,368
Consumer | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	53,030	63,033
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	10,576	12,882
Consumer | Other consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	9,226	11,167
Consumer | Other consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,350	$ 1,715

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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