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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 2,485,613	$ 1,129,064
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,452,630	1,129,064
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,032,983	0
Commercial Real Estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	826,746	418,119
Commercial Real Estate: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	534,011	418,119
Commercial Real Estate: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	292,735	0
Commercial Real Estate: | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	45,673	14,695
Commercial Real Estate: | Construction and land development | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	28,892	14,695
Commercial Real Estate: | Construction and land development | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	16,781	0
Commercial Real Estate: | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	781,073	403,424
Commercial Real Estate: | Other commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	505,119	403,424
Commercial Real Estate: | Other commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	275,954	0
Commercial and Industrial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	379,423	151,240
Commercial and Industrial: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	268,004	151,240
Commercial and Industrial: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	111,419	0
Commercial and Industrial: | Other Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	266,120	103,586
Commercial and Industrial: | Other Commercial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	198,051	103,586
Commercial and Industrial: | Other Commercial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	68,069	0
Commercial and Industrial: | Agricultural and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	27,588	31,808
Commercial and Industrial: | Agricultural and other loans to farmers | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	27,588	31,808
Commercial and Industrial: | Agricultural and other loans to farmers | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	0	0
Commercial and Industrial: | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	85,715	15,846
Commercial and Industrial: | Tax exempt | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	42,365	15,846
Commercial and Industrial: | Tax exempt | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	43,350	0
Total Commercial Loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,206,169	569,359
Total Commercial Loans: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	802,015	569,359
Total Commercial Loans: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	404,154	0
Residential Real Estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,155,682	506,612
Residential Real Estate: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	591,411	506,612
Residential Real Estate: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	564,271	0
Residential Real Estate: | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,155,682	506,612
Residential Real Estate: | Residential mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	591,411	506,612
Residential Real Estate: | Residential mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	564,271	0
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	123,762	53,093
Consumer: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	59,204	53,093
Consumer: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	64,558	0
Consumer: | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	113,593	46,921
Consumer: | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	51,376	46,921
Consumer: | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	62,217	0
Consumer: | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	10,169	6,172
Consumer: | Other consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	7,828	6,172
Consumer: | Other consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 2,341	$ 0

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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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