IMPAIRED LOANS AND ALLOWANCE FOR LOAN LOSSES - Loan Portfolio and Related Allowance (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Carrying Value
Individually Evaluated for Impairment	$ 31,424	$ 32,718
Collectively Evaluated for Impairment	2,929,353	2,833,822
Total	2,960,777	2,866,540
Associated Allowance
Individually Evaluated for Impairment	1,782	2,454
Collectively Evaluated for Impairment	22,780	20,946
Total	24,562	23,400
PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	12,982	12,996
Associated Allowance
Individually Evaluated for Impairment	0
Collectively Evaluated for Impairment		0
Construction and Land Development [Member]
Carrying Value
Individually Evaluated for Impairment	760	277
Collectively Evaluated for Impairment	174,117	159,839
Total	174,877	160,116
Associated Allowance
Individually Evaluated for Impairment	21	0
Collectively Evaluated for Impairment	1,331	1,219
Total	1,352	1,219
Construction and Land Development [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	114	114
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial Real Estate [Member]
Carrying Value
Individually Evaluated for Impairment	8,521	10,204
Collectively Evaluated for Impairment	1,334,340	1,335,832
Total	1,342,861	1,346,036
Associated Allowance
Individually Evaluated for Impairment	275	395
Collectively Evaluated for Impairment	9,586	8,878
Total	9,861	9,273
Commercial Real Estate [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	11,279	11,257
Associated Allowance
Individually Evaluated for Impairment	0	0
Residential Real Estate [Member]
Carrying Value
Individually Evaluated for Impairment	21,277	22,038
Collectively Evaluated for Impairment	871,709	814,250
Total	892,986	836,288
Associated Allowance
Individually Evaluated for Impairment	1,427	2,059
Collectively Evaluated for Impairment	5,637	5,424
Total	7,064	7,483
Residential Real Estate [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	689	684
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial And Financial [Member]
Carrying Value
Individually Evaluated for Impairment	409	199
Collectively Evaluated for Impairment	383,880	369,449
Total	384,289	369,648
Associated Allowance
Individually Evaluated for Impairment	25	0
Collectively Evaluated for Impairment	4,610	3,636
Total	4,635	3,636
Commercial And Financial [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	900	941
Associated Allowance
Individually Evaluated for Impairment	0	0
Consumer [Member]
Carrying Value
Individually Evaluated for Impairment	457	0
Collectively Evaluated for Impairment	165,307	154,452
Total	165,764	154,452
Associated Allowance
Individually Evaluated for Impairment	34	0
Collectively Evaluated for Impairment	1,616	1,789
Total	1,650	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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-Topic 310
-SubTopic 10
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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