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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 2,376,647	$ 1,129,064
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,263,938	1,129,064
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,112,709	0
Commercial Real Estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	738,584	418,119
Commercial Real Estate: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	430,754	418,119
Commercial Real Estate: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	307,830	0
Commercial Real Estate: | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	43,895	14,695
Commercial Real Estate: | Construction and land development | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	27,428	14,695
Commercial Real Estate: | Construction and land development | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	16,467	0
Commercial Real Estate: | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	694,689	403,424
Commercial Real Estate: | Other commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	403,326	403,424
Commercial Real Estate: | Other commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	291,363	0
Commercial and Industrial:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	350,002	151,240
Commercial and Industrial: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	228,151	151,240
Commercial and Industrial: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	121,851	0
Commercial and Industrial: | Other Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	238,501	103,586
Commercial and Industrial: | Other Commercial | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	158,434	103,586
Commercial and Industrial: | Other Commercial | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	80,067	0
Commercial and Industrial: | Agricultural and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	31,459	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	31,459	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	80,042	15,846
Commercial and Industrial: | Tax exempt | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	38,258	15,846
Commercial and Industrial: | Tax exempt | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	41,784	0
Total Commercial Loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,088,586	569,359
Total Commercial Loans: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	658,905	569,359
Total Commercial Loans: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	429,681	0
Residential Real Estate:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,160,832	506,612
Residential Real Estate: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	549,578	506,612
Residential Real Estate: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	611,254	0
Residential Real Estate: | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,160,832	506,612
Residential Real Estate: | Residential mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	549,578	506,612
Residential Real Estate: | Residential mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	611,254	0
Consumer:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	127,229	53,093
Consumer: | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	55,455	53,093
Consumer: | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	71,774	0
Consumer: | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	116,469	46,921
Consumer: | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	47,762	46,921
Consumer: | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	68,707	0
Consumer: | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	10,760	6,172
Consumer: | Other consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	7,693	6,172
Consumer: | Other consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 3,067	$ 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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