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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 2,483,590	$ 2,485,613
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,587,172	1,452,630
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	896,418	1,032,983
Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	840,018	826,746
Total commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	585,166	534,011
Total commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	254,852	292,735
Total commercial real estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	40,451	45,673
Total commercial real estate | Construction and land development | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	37,525	28,892
Total commercial real estate | Construction and land development | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	2,926	16,781
Total commercial real estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	799,567	781,073
Total commercial real estate | Other commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	547,641	505,119
Total commercial real estate | Other commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	251,926	275,954
Total commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	385,814	379,423
Total commercial and industrial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	293,021	268,004
Total commercial and industrial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	92,793	111,419
Total commercial and industrial | Other Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	279,506	266,120
Total commercial and industrial | Other Commercial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	225,965	198,051
Total commercial and industrial | Other Commercial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	53,541	68,069
Total commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	24,478	27,588
Total commercial and industrial | Agricultural | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	24,478	27,588
Total commercial and industrial | Agricultural | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	0	0
Total commercial and industrial | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	81,830	85,715
Total commercial and industrial | Tax exempt | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	42,578	42,365
Total commercial and industrial | Tax exempt | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	39,252	43,350
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,225,832	1,206,169
Total commercial loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	878,187	802,015
Total commercial loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	347,645	404,154
Total residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,140,519	1,155,682
Total residential real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	643,038	591,411
Total residential real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	497,481	564,271
Total residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,140,519	1,155,682
Total residential real estate | Residential mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	643,038	591,411
Total residential real estate | Residential mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	497,481	564,271
Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	117,239	123,762
Total consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	65,947	59,204
Total consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	51,292	64,558
Total consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	105,193	113,593
Total consumer | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	55,538	51,376
Total consumer | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	49,655	62,217
Total consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	12,046	10,169
Total consumer | Other consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	10,409	7,828
Total consumer | Other consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 1,637	$ 2,341

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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=82891408&loc=d3e4428-111522

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