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ALLOWANCE FOR LOAN LOSSES - Loan losses on the basis of Company's impairment methodology (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Allowance for loan losses on the basis of Company's impairment methodology
Loans individually evaluated for impairment	$ 28,912,000	$ 29,655,000
Loans collectively evaluated for impairment	2,288,877,000	2,130,391,000
Total	2,317,789,000	2,160,046,000
Allowance allocated to specific reserves for loans individually evaluated for impairment	1,000,000	668,000
Commercial and industrial
Allowance for loan losses on the basis of Company's impairment methodology
Loans individually evaluated for impairment	7,292,000	12,315,000
Loans collectively evaluated for impairment	552,071,000	499,239,000
Total	559,363,000	511,554,000
Commercial real estate
Allowance for loan losses on the basis of Company's impairment methodology
Loans individually evaluated for impairment	9,293,000	6,264,000
Loans collectively evaluated for impairment	729,000,000	691,530,000
Total	738,293,000	697,794,000
Construction and development
Allowance for loan losses on the basis of Company's impairment methodology
Loans individually evaluated for impairment	251,000	476,000
Loans collectively evaluated for impairment	448,960,000	491,150,000
Total	449,211,000	491,626,000
One to four family residential
Allowance for loan losses on the basis of Company's impairment methodology
Loans individually evaluated for impairment	4,924,000	1,712,000
Loans collectively evaluated for impairment	253,660,000	235,170,000
Total	258,584,000	236,882,000
Multi‑family residential
Allowance for loan losses on the basis of Company's impairment methodology
Loans individually evaluated for impairment		7,000
Loans collectively evaluated for impairment	220,305,000	133,203,000
Total	220,305,000	133,210,000
Consumer
Allowance for loan losses on the basis of Company's impairment methodology
Loans collectively evaluated for impairment	40,433,000	39,694,000
Total	40,433,000	39,694,000
Agriculture
Allowance for loan losses on the basis of Company's impairment methodology
Loans individually evaluated for impairment		36,000
Loans collectively evaluated for impairment	11,256,000	11,070,000
Total	11,256,000	11,106,000
Other
Allowance for loan losses on the basis of Company's impairment methodology
Loans individually evaluated for impairment	7,152,000	8,845,000
Loans collectively evaluated for impairment	33,192,000	29,335,000
Total	$ 40,344,000	$ 38,180,000

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
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