LOANS AND ALLOWANCE FOR LOAN LOSSES (Summary of Aging of the Acquired with Deteriorated Credit Quality Loan Portfolio by Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	$ 5,424,509	$ 5,172,879
Total	78,606	105,788	$ 119,743
Commercial Construction [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	424,978	335,715
Total	2,459	3,782
Commercial Real Estate - Owner Occupied [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	828,874	839,370
Total	28,695	31,167
Commercial Real Estate - Non-Owner Occupied [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	1,567,415	1,470,076
Total	15,172	28,869
Raw Land and Lots [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	181,455	201,056
Total	5,141	7,427
Single Family Investment Real Estate [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	419,217	389,648
Total	15,167	16,879
Commercial and Industrial [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	439,136	384,307
Total	2,249	3,855
Other Commercial [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	87,847	78,732
Total	793	2,256
Indirect Auto [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	$ 216,134	$ 197,238
Total
Mortgage [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	$ 450,142	$ 447,026
Total	5,561	7,394
Consumer Construction [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	54,398	72,688
Total	251	516
HELOCs [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	485,220	493,464
Total	1,812	2,000
Other Consumer [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	227,174	197,054
Total	1,306	1,643
Purchased Impaired [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	4,978	6,181
Greater than 90 Days	5,739	10,013
Current	67,889	89,594
Total	$ 78,606	$ 105,788
Purchased Impaired [Member] | Commercial Construction [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due
Greater than 90 Days	$ 459	$ 652
Current	2,000	3,130
Total	2,459	3,782
Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	1,024	1,138
Greater than 90 Days	1,752	843
Current	25,919	29,186
Total	28,695	31,167
Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	1,202	523
Greater than 90 Days	392	1,255
Current	13,578	27,091
Total	15,172	28,869
Purchased Impaired [Member] | Raw Land and Lots [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	196	$ 522
Greater than 90 Days	70
Current	4,875	$ 6,905
Total	5,141	7,427
Purchased Impaired [Member] | Single Family Investment Real Estate [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	1,225	1,327
Greater than 90 Days	646	1,311
Current	13,296	14,241
Total	15,167	16,879
Purchased Impaired [Member] | Commercial and Industrial [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	412	144
Greater than 90 Days	69	538
Current	1,768	3,173
Total	2,249	3,855
Purchased Impaired [Member] | Other Commercial [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	31	107
Greater than 90 Days	63	1,133
Current	699	1,016
Total	793	2,256
Purchased Impaired [Member] | Mortgage [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	597	1,975
Greater than 90 Days	1,612	2,866
Current	3,352	2,553
Total	$ 5,561	$ 7,394
Purchased Impaired [Member] | Consumer Construction [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due
Greater than 90 Days	$ 251	$ 516
Current
Total	251	$ 516
Purchased Impaired [Member] | HELOCs [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	244	356
Greater than 90 Days	365	728
Current	1,203	916
Total	1,812	2,000
Purchased Impaired [Member] | Other Consumer [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	47	89
Greater than 90 Days	60	171
Current	1,199	1,383
Total	$ 1,306	$ 1,643