Quarterly report pursuant to Section 13 or 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Purchased Impaired Commercial and Consumer Loan Portfolios by Class) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Purchased Impaired Commercial and Consumer Loan Portfolios by Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Current $ 5,662,251 $ 5,542,840  
Total loans held for investment, net 5,780,502 [1] 5,671,462 [1] $ 5,387,755
Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 70,105 73,737  
Current 61,827 64,455  
Total loans held for investment, net 70,105 73,737 91,346
Construction and Land Development [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Current 765,461 737,958  
Total loans held for investment, net 776,698 749,720 657,581
Construction and Land Development [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 5,137 5,986  
Current 4,544 5,376  
Total loans held for investment, net 5,137 5,986 9,529
Commercial Real Estate - Owner Occupied [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Current 816,180 826,859  
Total loans held for investment, net 849,202 860,086 898,222
Commercial Real Estate - Owner Occupied [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 27,260 27,388  
Current 24,434 24,837  
Total loans held for investment, net 27,260 27,388 31,004
Commercial Real Estate - Non-Owner Occupied [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Current 1,281,592 1,255,367  
Total loans held for investment, net 1,296,251 1,270,480 1,180,464
Commercial Real Estate - Non-Owner Occupied [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 13,636 13,519  
Current 12,686 12,562  
Total loans held for investment, net 13,636 13,519 16,648
Multifamily Real Estate [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Current 320,983 320,701  
Total loans held for investment, net 323,270 322,528 298,651
Multifamily Real Estate [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 2,132 1,555  
Current 2,132 1,555  
Total loans held for investment, net 2,132 1,555 3,021
Commercial & Industrial [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Current 449,136 431,916  
Total loans held for investment, net 453,208 435,365 409,867
Commercial & Industrial [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 1,571 1,813  
Current 1,336 1,583  
Total loans held for investment, net 1,571 1,813 3,251
Residential 1-4 Family [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Current 937,408 928,312  
Total loans held for investment, net 978,478 978,469 970,928
Residential 1-4 Family [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 18,305 21,159  
Current 15,340 17,093  
Total loans held for investment, net 18,305 21,159 24,654
HELOC [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Current 511,041 509,124  
Total loans held for investment, net 517,122 516,726 514,750
HELOC [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 1,535 1,791  
Current 826 923  
Total loans held for investment, net 1,535 1,791 1,889
Consumer and all Other [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Current 340,573 301,339  
Total loans held for investment, net 344,536 304,027 245,999
Consumer and all Other [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 529 526  
Current 529 526  
Total loans held for investment, net 529 526 $ 1,350
30 To 89 Days Past Due [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 4,776 5,025  
30 To 89 Days Past Due [Member] | Construction and Land Development [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 354 369  
30 To 89 Days Past Due [Member] | Commercial Real Estate - Owner Occupied [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 1,401 1,139  
30 To 89 Days Past Due [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 745 755  
30 To 89 Days Past Due [Member] | Commercial & Industrial [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 196 209  
30 To 89 Days Past Due [Member] | Residential 1-4 Family [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 1,917 2,143  
30 To 89 Days Past Due [Member] | HELOC [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 163 410  
Greater Than 90 Days and still Accruing [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 5,723 5,829  
Greater Than 90 Days and still Accruing [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 3,502 4,257  
Greater Than 90 Days and still Accruing [Member] | Construction and Land Development [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 544 128  
Greater Than 90 Days and still Accruing [Member] | Construction and Land Development [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 239 241  
Greater Than 90 Days and still Accruing [Member] | Commercial Real Estate - Owner Occupied [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 196 103  
Greater Than 90 Days and still Accruing [Member] | Commercial Real Estate - Owner Occupied [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 1,425 1,412  
Greater Than 90 Days and still Accruing [Member] | Commercial Real Estate - Non-Owner Occupied [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 723 723  
Greater Than 90 Days and still Accruing [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 205 202  
Greater Than 90 Days and still Accruing [Member] | Multifamily Real Estate [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due   272  
Greater Than 90 Days and still Accruing [Member] | Commercial & Industrial [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 422 124  
Greater Than 90 Days and still Accruing [Member] | Commercial & Industrial [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 39 21  
Greater Than 90 Days and still Accruing [Member] | Residential 1-4 Family [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 2,247 3,638  
Greater Than 90 Days and still Accruing [Member] | Residential 1-4 Family [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 1,048 1,923  
Greater Than 90 Days and still Accruing [Member] | HELOC [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 1,315 762  
Greater Than 90 Days and still Accruing [Member] | HELOC [Member] | Purchased Impaired [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due 546 458  
Greater Than 90 Days and still Accruing [Member] | Consumer and all Other [Member]      
Schedule of purchased impaired commercial and consumer loan portfolios, by class      
Past Due $ 223 $ 19  
[1] Loans, as presented, are net of deferred fees and costs totaling $3.6 million and $3.0 million as of March 31, 2016 and December 31, 2015, respectively.