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LOANS - Summary of Total Loans (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 2,729,417	$ 2,641,092
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,019,602	1,835,230
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	709,815	805,862
Acquired Loans | Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	14,800
Total note balances	18,700
Acquired Loans | Financial Asset Acquired and No Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	695,000
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,521,512	1,353,952
Total commercial loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,226,054	1,024,008
Total commercial loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	295,458	329,944
Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	982,070	930,661
Total commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	783,045	697,438
Total commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	199,025	233,223
Total commercial real estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	62,473	34,290
Total commercial real estate | Construction and land development | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	60,096	31,387
Total commercial real estate | Construction and land development | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,377	2,903
Total commercial real estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	919,597	896,371
Total commercial real estate | Other commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	722,949	666,051
Total commercial real estate | Other commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	196,648	230,320
Total commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	539,442	423,291
Total commercial and industrial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	443,009	326,570
Total commercial and industrial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	96,433	96,721
Total commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	454,339	298,764
Total commercial and industrial | Commercial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	384,390	239,692
Total commercial and industrial | Commercial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	69,949	59,072
Total commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,185	20,224
Total commercial and industrial | Agricultural | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,026	20,018
Total commercial and industrial | Agricultural | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	159	206
Total commercial and industrial | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	66,918	104,303
Total commercial and industrial | Tax exempt | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	40,593	66,860
Total commercial and industrial | Tax exempt | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	26,325	37,443
Total residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,083,708	1,151,857
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]
Loans	$ 725,450	740,687
Total residential real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	358,258	411,170
Total residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,083,708	1,151,857
Total residential real estate | Residential mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	725,450	740,687
Total residential real estate | Residential mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	358,258	411,170
Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	124,197	135,283
Total consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	68,098	70,535
Total consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	56,099	64,748
Total consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	114,099	122,401
Total consumer | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	59,413	59,368
Total consumer | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	54,686	63,033
Total consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	10,098	12,882
Total consumer | Other consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,685	11,167
Total consumer | Other consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,413	$ 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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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.

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