IMPAIRED LOANS AND ALLOWANCE FOR LOAN LOSSES - Loan Portfolio and Related Allowance (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Carrying Value
Individually Evaluated for Impairment	$ 29,715	$ 32,727
Collectively Evaluated for Impairment	2,726,566	2,111,494
Total	2,756,281	2,144,221
Associated Allowance
Individually Evaluated for Impairment	2,045	2,517
Collectively Evaluated for Impairment	20,639	16,611
Total	22,684	19,128
PCI Loans [Member]
Carrying Value
Total	13,057	12,109
Associated Allowance
Total	0	0
Construction and Land Development [Member]
Carrying Value
Individually Evaluated for Impairment	796	942
Collectively Evaluated for Impairment	152,991	107,731
Total	153,787	108,673
Associated Allowance
Individually Evaluated for Impairment	42	84
Collectively Evaluated for Impairment	1,191	1,067
Total	1,233	1,151
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	7,387	9,450
Collectively Evaluated for Impairment	1,274,844	989,938
Total	1,282,231	999,388
Associated Allowance
Individually Evaluated for Impairment	346	429
Collectively Evaluated for Impairment	8,387	6,327
Total	8,733	6,756
Commercial Real Estate [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	11,281	9,990
Associated Allowance
Individually Evaluated for Impairment	0	0
Residential Real Estate [Member]
Carrying Value
Individually Evaluated for Impairment	20,985	21,703
Collectively Evaluated for Impairment	811,743	701,160
Total	832,728	722,863
Associated Allowance
Individually Evaluated for Impairment	1,608	1,964
Collectively Evaluated for Impairment	6,301	6,093
Total	7,909	8,057
Residential Real Estate [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	685	922
Associated Allowance
Individually Evaluated for Impairment	0	0
Commercial And Financial [Member]
Carrying Value
Individually Evaluated for Impairment	19	17
Collectively Evaluated for Impairment	341,505	227,417
Total	341,524	227,434
Associated Allowance
Individually Evaluated for Impairment	0	0
Collectively Evaluated for Impairment	3,036	2,042
Total	3,036	2,042
Commercial And Financial [Member] \| PCI Loans [Member]
Carrying Value
Individually Evaluated for Impairment	977	1,083
Associated Allowance
Individually Evaluated for Impairment	0	0
Consumer [Member]
Carrying Value
Individually Evaluated for Impairment	528	615
Collectively Evaluated for Impairment	145,483	85,248
Total	146,011	85,863
Associated Allowance
Individually Evaluated for Impairment	49	40
Collectively Evaluated for Impairment	1,724	1,082
Total	1,773	1,122
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.

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

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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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