LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding Purchased Impaired Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	$ 5,510,385	$ 5,345,996	$ 5,233,069
Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	378,204	341,280
Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	874,582	875,443
Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	1,569,306	1,509,159
Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	201,630	211,225
Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	435,068	412,494
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	450,682	393,776
Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	90,556	81,106
Excluding Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	3,922,509	3,730,248
Excluding Purchased Impaired [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	375,283	337,498
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	844,744	844,276
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	1,549,290	1,480,290
Excluding Purchased Impaired [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	196,527	203,798
Excluding Purchased Impaired [Member] | Single Family Investment Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	419,564	395,615
Excluding Purchased Impaired [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	447,657	389,921
Excluding Purchased Impaired [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	89,444	78,850
Excluding Purchased Impaired [Member] | 1-3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	944,887	805,908
Excluding Purchased Impaired [Member] | 1-3 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	34,756	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	183,155	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	407,562	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	11,696	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	66,052	59,638
Excluding Purchased Impaired [Member] | 1-3 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	195,917	138,973
Excluding Purchased Impaired [Member] | 1-3 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	45,749	31,571
Excluding Purchased Impaired [Member] | 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	2,757,857	2,662,344
Excluding Purchased Impaired [Member] | 4 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	310,970	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	629,284	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	1,081,215	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	132,386	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	333,533	311,900
Excluding Purchased Impaired [Member] | 4 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	231,994	230,084
Excluding Purchased Impaired [Member] | 4 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	38,475	40,913
Excluding Purchased Impaired [Member] | 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	86,878	89,056
Excluding Purchased Impaired [Member] | 5 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	17,583	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	14,460	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	22,487	22,358
Excluding Purchased Impaired [Member] | 5 [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	9,814	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	8,794	9,750
Excluding Purchased Impaired [Member] | 5 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	10,823	9,392
Excluding Purchased Impaired [Member] | 5 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	2,917	3,818
Excluding Purchased Impaired [Member] | 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	68,116	63,672
Excluding Purchased Impaired [Member] | 6 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	9,343	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	6,471	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	24,523	28,388
Excluding Purchased Impaired [Member] | 6 [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	16,359	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	6,190	6,680
Excluding Purchased Impaired [Member] | 6 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	4,319	4,383
Excluding Purchased Impaired [Member] | 6 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	911	844
Excluding Purchased Impaired [Member] | 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	63,189	109,268
Excluding Purchased Impaired [Member] | 7 [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	2,631	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	9,792	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	13,503	31,766
Excluding Purchased Impaired [Member] | 7 [Member] | Raw Land and Lots [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	26,272	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	4,995	7,647
Excluding Purchased Impaired [Member] | 7 [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	4,604	7,089
Excluding Purchased Impaired [Member] | 7 [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	1,392	$ 1,704
Excluding Purchased Impaired [Member] | 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans receivables related risk rating	$ 1,582
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	$ 1,582
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