IMPAIRED LOANS AND ALLOWANCE FOR LOAN LOSSES - Loan Portfolio and Related Allowance (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Carrying Value
Individually Evaluated for Impairment	$ 30,386	$ 32,718
Collectively Evaluated for Impairment	3,286,557	2,833,822
Total	3,316,943	2,866,540
Associated Allowance
Individually Evaluated for Impairment	1,911	2,454
Collectively Evaluated for Impairment	24,089	20,946
Total	26,000	23,400
PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	13,132	12,996
Associated Allowance
Individually Evaluated for Impairment	0	0
Construction and Land Development [Member]
Carrying Value
Individually Evaluated for Impairment	932	277
Collectively Evaluated for Impairment	229,529	159,839
Total	230,461	160,116
Associated Allowance
Individually Evaluated for Impairment	145	0
Collectively Evaluated for Impairment	1,429	1,219
Total	1,574	1,219
Construction and Land Development [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	113	114
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial Real Estate [Member]
Carrying Value
Individually Evaluated for Impairment	7,755	10,204
Collectively Evaluated for Impairment	1,444,850	1,335,832
Total	1,452,605	1,346,036
Associated Allowance
Individually Evaluated for Impairment	244	395
Collectively Evaluated for Impairment	9,679	8,878
Total	9,923	9,273
Commercial Real Estate [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	11,463	11,257
Associated Allowance
Individually Evaluated for Impairment	0	0
Residential Real Estate [Member]
Carrying Value
Individually Evaluated for Impairment	20,459	22,038
Collectively Evaluated for Impairment	969,983	814,250
Total	990,442	836,288
Associated Allowance
Individually Evaluated for Impairment	1,255	2,059
Collectively Evaluated for Impairment	6,168	5,424
Total	7,423	7,483
Residential Real Estate [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	702	684
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial And Financial [Member]
Carrying Value
Individually Evaluated for Impairment	758	199
Collectively Evaluated for Impairment	463,526	369,449
Total	464,284	369,648
Associated Allowance
Individually Evaluated for Impairment	209	0
Collectively Evaluated for Impairment	5,251	3,636
Total	5,460	3,636
Commercial And Financial [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	854	941
Associated Allowance
Individually Evaluated for Impairment	0	0
Consumer [Member]
Carrying Value
Individually Evaluated for Impairment	482	0
Collectively Evaluated for Impairment	178,669	154,452
Total	179,151	154,452
Associated Allowance
Individually Evaluated for Impairment	58	0
Collectively Evaluated for Impairment	1,562	1,789
Total	1,620	1,789
Consumer [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	0	0
Associated Allowance
Individually Evaluated for Impairment	$ 0	$ 0

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

+ References

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

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

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-Publisher FASB
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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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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.

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