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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 2,428,862	$ 1,129,064
Business Activities Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,151	8,928
Current	1,351,365	1,120,136
Total loans	1,359,516	1,129,064
Past Due 90 days and Accruing	0	0
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,678	5,074
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	579	1,029
Business Activities Loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,894	2,825
Business Activities Loans | Commercial Real Estate:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,867	2,414
Current	487,672	415,705
Total loans	489,539	418,119
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial Real Estate: | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	637	0
Current	33,055	14,695
Total loans	33,692	14,695
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial Real Estate: | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,230	2,414
Current	454,617	401,010
Total loans	455,847	403,424
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial Real Estate: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	407	195
Business Activities Loans | Commercial Real Estate: | 30-59 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial Real Estate: | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	407	195
Business Activities Loans | Commercial Real Estate: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	121	554
Business Activities Loans | Commercial Real Estate: | 60-89 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial Real Estate: | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	121	554
Business Activities Loans | Commercial Real Estate: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,339	1,665
Business Activities Loans | Commercial Real Estate: | 90 Days or Greater Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	637	0
Business Activities Loans | Commercial Real Estate: | 90 Days or Greater Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	702	1,665
Business Activities Loans | Commercial and Industrial:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,410	538
Current	242,035	150,702
Total loans	243,445	151,240
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial and Industrial: | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	710	307
Current	171,476	103,279
Total loans	172,186	103,586
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial and Industrial: | Agricultural and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	700	231
Current	29,783	31,577
Total loans	30,483	31,808
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial and Industrial: | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	40,776	15,846
Total loans	40,776	15,846
Past Due 90 days and Accruing	0	0
Business Activities Loans | Commercial and Industrial: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,001	292
Business Activities Loans | Commercial and Industrial: | 30-59 Days Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	401	61
Business Activities Loans | Commercial and Industrial: | 30-59 Days Past Due | Agricultural and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	600	231
Business Activities Loans | Commercial and Industrial: | 30-59 Days Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial and Industrial: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	240	45
Business Activities Loans | Commercial and Industrial: | 60-89 Days Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	150	45
Business Activities Loans | Commercial and Industrial: | 60-89 Days Past Due | Agricultural and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	90	0
Business Activities Loans | Commercial and Industrial: | 60-89 Days Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial and Industrial: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	169	201
Business Activities Loans | Commercial and Industrial: | 90 Days or Greater Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	159	201
Business Activities Loans | Commercial and Industrial: | 90 Days or Greater Past Due | Agricultural and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10	0
Business Activities Loans | Commercial and Industrial: | 90 Days or Greater Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Total Commercial Loans:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,277	2,952
Current	729,707	566,407
Total loans	732,984	569,359
Past Due 90 days and Accruing	0	0
Business Activities Loans | Total Commercial Loans: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,408	487
Business Activities Loans | Total Commercial Loans: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	361	599
Business Activities Loans | Total Commercial Loans: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,508	1,866
Business Activities Loans | Residential Real Estate:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,336	5,851
Current	563,941	500,761
Total loans	568,277	506,612
Past Due 90 days and Accruing	0	0
Business Activities Loans | Residential Real Estate: | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,336	5,851
Current	563,941	500,761
Total loans	568,277	506,612
Past Due 90 days and Accruing	0	0
Business Activities Loans | Residential Real Estate: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,904	4,484
Business Activities Loans | Residential Real Estate: | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,904	4,484
Business Activities Loans | Residential Real Estate: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	172	429
Business Activities Loans | Residential Real Estate: | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	172	429
Business Activities Loans | Residential Real Estate: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,260	938
Business Activities Loans | Residential Real Estate: | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,260	938
Business Activities Loans | Consumer:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	538	125
Current	57,717	52,968
Total loans	58,255	53,093
Past Due 90 days and Accruing	0	0
Business Activities Loans | Consumer: | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	431	15
Current	50,179	46,906
Total loans	50,610	46,921
Past Due 90 days and Accruing	0	0
Business Activities Loans | Consumer: | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	107	110
Current	7,538	6,062
Total loans	7,645	6,172
Past Due 90 days and Accruing	0	0
Business Activities Loans | Consumer: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	366	103
Business Activities Loans | Consumer: | 30-59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	306	0
Business Activities Loans | Consumer: | 30-59 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	60	103
Business Activities Loans | Consumer: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	46	1
Business Activities Loans | Consumer: | 60-89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	25	0
Business Activities Loans | Consumer: | 60-89 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	21	1
Business Activities Loans | Consumer: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	126	21
Business Activities Loans | Consumer: | 90 Days or Greater Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	100	15
Business Activities Loans | Consumer: | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	26	6
Acquired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,411
Acquired Credit Impaired	14,376
Total loans	1,069,346
Past Due 90 days and Accruing	163
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,219
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	491
Acquired Loans | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,701
Acquired Loans | Commercial Real Estate:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	960
Acquired Credit Impaired	10,018
Total loans	304,033	0
Past Due 90 days and Accruing	0
Acquired Loans | Commercial Real Estate: | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	30
Acquired Credit Impaired	258
Total loans	15,593	0
Past Due 90 days and Accruing	0
Acquired Loans | Commercial Real Estate: | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	930
Acquired Credit Impaired	9,760
Total loans	288,440	0
Past Due 90 days and Accruing	0
Acquired Loans | Commercial Real Estate: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	334
Acquired Loans | Commercial Real Estate: | 30-59 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20
Acquired Loans | Commercial Real Estate: | 30-59 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	314
Acquired Loans | Commercial Real Estate: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	35
Acquired Loans | Commercial Real Estate: | 60-89 Days Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10
Acquired Loans | Commercial Real Estate: | 60-89 Days Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	25
Acquired Loans | Commercial Real Estate: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	591
Acquired Loans | Commercial Real Estate: | 90 Days or Greater Past Due | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Loans | Commercial Real Estate: | 90 Days or Greater Past Due | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	591
Acquired Loans | Commercial and Industrial:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	540
Acquired Credit Impaired	917
Total loans	113,627	0
Past Due 90 days and Accruing	163
Acquired Loans | Commercial and Industrial: | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	540
Acquired Credit Impaired	917
Total loans	68,090	0
Past Due 90 days and Accruing	163
Acquired Loans | Commercial and Industrial: | Agricultural and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Credit Impaired	0
Total loans	0	0
Past Due 90 days and Accruing	0
Acquired Loans | Commercial and Industrial: | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Credit Impaired	0
Total loans	45,537	$ 0
Past Due 90 days and Accruing	0
Acquired Loans | Commercial and Industrial: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	396
Acquired Loans | Commercial and Industrial: | 30-59 Days Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	396
Acquired Loans | Commercial and Industrial: | 30-59 Days Past Due | Agricultural and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Loans | Commercial and Industrial: | 30-59 Days Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Loans | Commercial and Industrial: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	144
Acquired Loans | Commercial and Industrial: | 60-89 Days Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	144
Acquired Loans | Commercial and Industrial: | 60-89 Days Past Due | Agricultural and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Loans | Commercial and Industrial: | 60-89 Days Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Loans | Commercial and Industrial: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Loans | Commercial and Industrial: | 90 Days or Greater Past Due | Other Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Loans | Commercial and Industrial: | 90 Days or Greater Past Due | Agricultural and other loans to farmers
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Loans | Commercial and Industrial: | 90 Days or Greater Past Due | Tax exempt
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Acquired Loans | Total Commercial Loans:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,500
Acquired Credit Impaired	10,935
Total loans	417,660
Past Due 90 days and Accruing	163
Acquired Loans | Total Commercial Loans: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	730
Acquired Loans | Total Commercial Loans: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	179
Acquired Loans | Total Commercial Loans: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	591
Acquired Loans | Residential Real Estate:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,970
Acquired Credit Impaired	3,398
Total loans	584,351
Past Due 90 days and Accruing	0
Acquired Loans | Residential Real Estate: | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,970
Acquired Credit Impaired	3,398
Total loans	584,351
Past Due 90 days and Accruing	0
Acquired Loans | Residential Real Estate: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,089
Acquired Loans | Residential Real Estate: | 30-59 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,089
Acquired Loans | Residential Real Estate: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13
Acquired Loans | Residential Real Estate: | 60-89 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13
Acquired Loans | Residential Real Estate: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	868
Acquired Loans | Residential Real Estate: | 90 Days or Greater Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	868
Acquired Loans | Consumer:
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	941
Acquired Credit Impaired	43
Total loans	67,335
Past Due 90 days and Accruing	0
Acquired Loans | Consumer: | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	736
Acquired Credit Impaired	40
Total loans	64,695
Past Due 90 days and Accruing	0
Acquired Loans | Consumer: | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	205
Acquired Credit Impaired	3
Total loans	2,640
Past Due 90 days and Accruing	0
Acquired Loans | Consumer: | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	400
Acquired Loans | Consumer: | 30-59 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	388
Acquired Loans | Consumer: | 30-59 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	12
Acquired Loans | Consumer: | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	299
Acquired Loans | Consumer: | 60-89 Days Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	155
Acquired Loans | Consumer: | 60-89 Days Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	144
Acquired Loans | Consumer: | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	242
Acquired Loans | Consumer: | 90 Days or Greater Past Due | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	193
Acquired Loans | Consumer: | 90 Days or Greater Past Due | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 49

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The carrying amount as of the balance sheet date of loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer, for which it was deemed probable at acquisition that the investor would be unable to collect all contractually required payments, and to which the income recognition total model was not applied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Financing receivables that are current.

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-Name Accounting Standards Codification
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+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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