LOANS AND ALLOWANCE FOR LOAN LOSSES (Purchased Impaired Commercial and Consumer Loan Portfolios by Class) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	$ 5,236,282	$ 5,172,879
Fair value of loans acquired with a deterioration of credit quality	91,346	105,788	138,431
Commercial Construction [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	353,019	335,715
Fair value of loans acquired with a deterioration of credit quality	3,090	3,782
Commercial Real Estate - Owner Occupied [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	859,127	839,370
Fair value of loans acquired with a deterioration of credit quality	31,004	31,167
Commercial Real Estate - Non-Owner Occupied [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	1,494,032	1,470,076
Fair value of loans acquired with a deterioration of credit quality	19,575	28,869
Raw Land and Lots [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	190,243	201,056
Fair value of loans acquired with a deterioration of credit quality	6,055	7,427
Single Family Investment Real Estate [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	397,768	389,648
Fair value of loans acquired with a deterioration of credit quality	16,299	16,879
Commercial and Industrial [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	418,420	384,307
Fair value of loans acquired with a deterioration of credit quality	3,338	3,855
Other Commercial [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	78,136	78,732
Fair value of loans acquired with a deterioration of credit quality	1,794	2,256
Indirect Auto [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	201,571	197,238
Fair value of loans acquired with a deterioration of credit quality
Mortgage [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	439,141	447,026
Fair value of loans acquired with a deterioration of credit quality	6,381	7,394
Consumer Construction [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	63,508	72,688
Fair value of loans acquired with a deterioration of credit quality	504	516
HELOCs [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	484,204	493,464
Fair value of loans acquired with a deterioration of credit quality	1,889	2,000
Other Consumer [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
Current	189,322	197,054
Fair value of loans acquired with a deterioration of credit quality	1,417	1,643
Receivables Acquired with Deteriorated Credit Quality [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	5,616	6,181
Greater than 90 Days	8,461	10,013
Current	77,269	89,594
Fair value of loans acquired with a deterioration of credit quality	91,346	105,788
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Construction [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due
Greater than 90 Days	599	652
Current	2,491	3,130
Fair value of loans acquired with a deterioration of credit quality	3,090	3,782
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Real Estate - Owner Occupied [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	1,357	1,138
Greater than 90 Days	1,966	843
Current	27,681	29,186
Fair value of loans acquired with a deterioration of credit quality	31,004	31,167
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	747	523
Greater than 90 Days	321	1,255
Current	18,507	27,091
Fair value of loans acquired with a deterioration of credit quality	19,575	28,869
Receivables Acquired with Deteriorated Credit Quality [Member] | Raw Land and Lots [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	155	522
Greater than 90 Days	259
Current	5,641	6,905
Fair value of loans acquired with a deterioration of credit quality	6,055	7,427
Receivables Acquired with Deteriorated Credit Quality [Member] | Single Family Investment Real Estate [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	1,721	1,327
Greater than 90 Days	697	1,311
Current	13,881	14,241
Fair value of loans acquired with a deterioration of credit quality	16,299	16,879
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial and Industrial [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	214	144
Greater than 90 Days	174	538
Current	2,950	3,173
Fair value of loans acquired with a deterioration of credit quality	3,338	3,855
Receivables Acquired with Deteriorated Credit Quality [Member] | Other Commercial [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	66	107
Greater than 90 Days	803	1,133
Current	925	1,016
Fair value of loans acquired with a deterioration of credit quality	1,794	2,256
Receivables Acquired with Deteriorated Credit Quality [Member] | Mortgage [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	1,123	1,975
Greater than 90 Days	2,574	2,866
Current	2,684	2,553
Fair value of loans acquired with a deterioration of credit quality	6,381	7,394
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer Construction [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due
Greater than 90 Days	504	516
Current
Fair value of loans acquired with a deterioration of credit quality	504	516
Receivables Acquired with Deteriorated Credit Quality [Member] | HELOCs [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	146	356
Greater than 90 Days	527	728
Current	1,216	916
Fair value of loans acquired with a deterioration of credit quality	1,889	2,000
Receivables Acquired with Deteriorated Credit Quality [Member] | Other Consumer [Member]
Schedule of purchased impaired commercial and consumer loan portfolios, by class
30-89 Days Past Due	87	89
Greater than 90 Days	37	171
Current	1,293	1,383
Fair value of loans acquired with a deterioration of credit quality	$ 1,417	$ 1,643