LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding Purchased Impaired Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 5,780,502	[1]	$ 5,671,462	[1]	$ 5,387,755
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	776,698		749,720		657,581
Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	849,202		860,086		898,222
Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,296,251		1,270,480		1,180,464
Multifamily Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	323,270		322,528		298,651
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	453,208		435,365		409,867
Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	978,478		978,469		970,928
Auto [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	241,737		234,061		211,293
HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	517,122		516,726		514,750
Consumer and all Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	344,536		304,027		$ 245,999
Excluding Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,710,397		5,597,725
Excluding Purchased Impaired [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,501,023		5,372,500
Excluding Purchased Impaired [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	146,786		161,222
Excluding Purchased Impaired [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	56,643		58,872
Excluding Purchased Impaired [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,945		5,131
Excluding Purchased Impaired [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	771,561		743,734
Excluding Purchased Impaired [Member] | Construction and Land Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	698,360		663,067
Excluding Purchased Impaired [Member] | Construction and Land Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	43,994		52,650
Excluding Purchased Impaired [Member] | Construction and Land Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	29,207		27,980
Excluding Purchased Impaired [Member] | Construction and Land Development [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income			37
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	821,942		832,698
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	791,197		800,979
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	22,297		20,856
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,685		8,931
Excluding Purchased Impaired [Member] | Commercial Real Estate - Owner Occupied [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,763		1,932
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,282,615		1,256,961
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,253,617		1,228,956
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	24,794		22,341
Excluding Purchased Impaired [Member] | Commercial Real Estate - Non-Owner Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,204		5,664
Excluding Purchased Impaired [Member] | Multifamily Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	321,138		320,973
Excluding Purchased Impaired [Member] | Multifamily Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	315,361		315,128
Excluding Purchased Impaired [Member] | Multifamily Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,975		2,017
Excluding Purchased Impaired [Member] | Multifamily Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,802		3,828
Excluding Purchased Impaired [Member] | Commercial & Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	451,637		433,552
Excluding Purchased Impaired [Member] | Commercial & Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	434,139		414,333
Excluding Purchased Impaired [Member] | Commercial & Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	14,668		16,724
Excluding Purchased Impaired [Member] | Commercial & Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,740		2,396
Excluding Purchased Impaired [Member] | Commercial & Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	90		99
Excluding Purchased Impaired [Member] | Residential 1-4 Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	960,173		957,310
Excluding Purchased Impaired [Member] | Residential 1-4 Family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	918,919		912,839
Excluding Purchased Impaired [Member] | Residential 1-4 Family [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	30,514		34,728
Excluding Purchased Impaired [Member] | Residential 1-4 Family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	8,170		8,037
Excluding Purchased Impaired [Member] | Residential 1-4 Family [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,570		1,706
Excluding Purchased Impaired [Member] | Auto [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	241,737		234,061
Excluding Purchased Impaired [Member] | Auto [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	239,838		230,670
Excluding Purchased Impaired [Member] | Auto [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,688		3,109
Excluding Purchased Impaired [Member] | Auto [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	77		194
Excluding Purchased Impaired [Member] | Auto [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	134		88
Excluding Purchased Impaired [Member] | HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	515,587		514,935
Excluding Purchased Impaired [Member] | HELOC [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	509,833		507,514
Excluding Purchased Impaired [Member] | HELOC [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,283		4,801
Excluding Purchased Impaired [Member] | HELOC [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,535		1,611
Excluding Purchased Impaired [Member] | HELOC [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	936		1,009
Excluding Purchased Impaired [Member] | Consumer and all Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	344,007		303,501
Excluding Purchased Impaired [Member] | Consumer and all Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	339,759		299,014
Excluding Purchased Impaired [Member] | Consumer and all Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,573		3,996
Excluding Purchased Impaired [Member] | Consumer and all Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	223		231
Excluding Purchased Impaired [Member] | Consumer and all Other [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 452		$ 260

[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.