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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 2,464,419	$ 2,485,613
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,471,016	1,452,630
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	993,403	1,032,983
Total Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	824,721	826,746
Total Commercial Real Estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	543,166	534,011
Total Commercial Real Estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	281,555	292,735
Total Commercial Real Estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	45,873	45,673
Total Commercial Real Estate | Construction and land development | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	31,073	28,892
Total Commercial Real Estate | Construction and land development | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	14,800	16,781
Total Commercial Real Estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	778,848	781,073
Total Commercial Real Estate | Other commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	512,093	505,119
Total Commercial Real Estate | Other commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	266,755	275,954
Total Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	387,205	379,423
Total Commercial and Industrial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	279,705	268,004
Total Commercial and Industrial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	107,500	111,419
Total Commercial and Industrial | Other Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	275,502	266,120
Total Commercial and Industrial | Other Commercial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	210,304	198,051
Total Commercial and Industrial | Other Commercial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	65,198	68,069
Total Commercial and Industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	26,309	27,588
Total Commercial and Industrial | Agricultural | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	26,309	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	85,394	85,715
Total Commercial and Industrial | Tax exempt | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	43,092	42,365
Total Commercial and Industrial | Tax exempt | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	42,302	43,350
Total Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,211,926	1,206,169
Total Commercial Loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	822,871	802,015
Total Commercial Loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	389,055	404,154
Total Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,132,977	1,155,682
Total Residential Real Estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	588,465	591,411
Total Residential Real Estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	544,512	564,271
Total Residential Real Estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,132,977	1,155,682
Total Residential Real Estate | Residential mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	588,465	591,411
Total Residential Real Estate | Residential mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	544,512	564,271
Total Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	119,516	123,762
Total Consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	59,680	59,204
Total Consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	59,836	64,558
Total Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	109,866	113,593
Total Consumer | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	52,100	51,376
Total Consumer | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	57,766	62,217
Total Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	9,650	10,169
Total Consumer | Other consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	7,580	7,828
Total Consumer | Other consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 2,070	$ 2,341

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+ References

No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-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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