LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding Purchased Impaired Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	$ 5,543,621	$ 5,345,996	$ 5,171,003
Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	429,645	341,280
Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	863,551	875,443
Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	1,586,334	1,509,159
Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	187,182	211,225
Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	436,340	412,494
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	444,199	393,776
Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	89,344	81,106
Excluding Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	3,966,919	3,730,248
Excluding Purchased Impaired [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	427,186	337,498
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	834,856	844,276
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	1,571,162	1,480,290
Excluding Purchased Impaired [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	182,041	203,798
Excluding Purchased Impaired [Member] | Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	421,173	395,615
Excluding Purchased Impaired [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	441,950	389,921
Excluding Purchased Impaired [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	88,551	78,850
Excluding Purchased Impaired [Member] | 0-3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	989,887
Excluding Purchased Impaired [Member] | 0-3 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	37,671
Excluding Purchased Impaired [Member] | 0-3 [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	179,846
Excluding Purchased Impaired [Member] | 0-3 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	467,026
Excluding Purchased Impaired [Member] | 0-3 [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	12,036
Excluding Purchased Impaired [Member] | 0-3 [Member] | Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	63,146
Excluding Purchased Impaired [Member] | 0-3 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	186,807
Excluding Purchased Impaired [Member] | 0-3 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	43,355
Excluding Purchased Impaired [Member] | 1-3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating		805,908
Excluding Purchased Impaired [Member] | 1-3 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating		22,512
Excluding Purchased Impaired [Member] | 1-3 [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating		185,789
Excluding Purchased Impaired [Member] | 1-3 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating		356,263
Excluding Purchased Impaired [Member] | 1-3 [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating		11,162
Excluding Purchased Impaired [Member] | 1-3 [Member] | Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating		59,638
Excluding Purchased Impaired [Member] | 1-3 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating		138,973
Excluding Purchased Impaired [Member] | 1-3 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating		31,571
Excluding Purchased Impaired [Member] | 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	2,764,246	2,662,344
Excluding Purchased Impaired [Member] | 4 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	355,150	289,064
Excluding Purchased Impaired [Member] | 4 [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	622,852	620,587
Excluding Purchased Impaired [Member] | 4 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	1,048,396	1,041,515
Excluding Purchased Impaired [Member] | 4 [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	122,236	128,281
Excluding Purchased Impaired [Member] | 4 [Member] | Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	339,683	311,900
Excluding Purchased Impaired [Member] | 4 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	235,543	230,084
Excluding Purchased Impaired [Member] | 4 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	40,386	40,913
Excluding Purchased Impaired [Member] | 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	85,364	89,056
Excluding Purchased Impaired [Member] | 5 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	22,661	11,932
Excluding Purchased Impaired [Member] | 5 [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	13,967	15,003
Excluding Purchased Impaired [Member] | 5 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	19,654	22,358
Excluding Purchased Impaired [Member] | 5 [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	7,307	16,803
Excluding Purchased Impaired [Member] | 5 [Member] | Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	8,430	9,750
Excluding Purchased Impaired [Member] | 5 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	10,732	9,392
Excluding Purchased Impaired [Member] | 5 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	2,613	3,818
Excluding Purchased Impaired [Member] | 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	64,321	63,672
Excluding Purchased Impaired [Member] | 6 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	8,857	10,906
Excluding Purchased Impaired [Member] | 6 [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	6,526	7,688
Excluding Purchased Impaired [Member] | 6 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	22,369	28,388
Excluding Purchased Impaired [Member] | 6 [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	15,792	4,783
Excluding Purchased Impaired [Member] | 6 [Member] | Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	5,210	6,680
Excluding Purchased Impaired [Member] | 6 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	4,669	4,383
Excluding Purchased Impaired [Member] | 6 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	898	844
Excluding Purchased Impaired [Member] | 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	60,869	109,268
Excluding Purchased Impaired [Member] | 7 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	2,847	3,084
Excluding Purchased Impaired [Member] | 7 [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	9,433	15,209
Excluding Purchased Impaired [Member] | 7 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	13,717	31,766
Excluding Purchased Impaired [Member] | 7 [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	24,670	42,769
Excluding Purchased Impaired [Member] | 7 [Member] | Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	4,704	7,647
Excluding Purchased Impaired [Member] | 7 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	4,199	7,089
Excluding Purchased Impaired [Member] | 7 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	1,299	$ 1,704
Excluding Purchased Impaired [Member] | 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	$ 2,232
Excluding Purchased Impaired [Member] | 8 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating
Excluding Purchased Impaired [Member] | 8 [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	$ 2,232
Excluding Purchased Impaired [Member] | 8 [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating
Excluding Purchased Impaired [Member] | 8 [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating
Excluding Purchased Impaired [Member] | 8 [Member] | Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating
Excluding Purchased Impaired [Member] | 8 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating
Excluding Purchased Impaired [Member] | 8 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating