LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Including Purchased Impaired Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 12,610,936	$ 9,716,207
Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,250,924	1,194,821
Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,041,243	1,337,345
Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,286,098	2,467,410
Multifamily Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	633,743	548,231
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,114,033	1,317,135
Residential 1-4 Family - Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	724,337	640,419
Residential 1-4 Family - Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	890,503	673,909
Residential 1-4 Family - Revolving
Financing Receivable, Recorded Investment [Line Items]
Total Loans	659,504	613,383
Auto
Financing Receivable, Recorded Investment [Line Items]
Total Loans	350,419	301,943
Consumer and all other
Financing Receivable, Recorded Investment [Line Items]
Total Loans	660,132	621,611
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	372,853	379,694
Other Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	287,279	241,917
Purchased Impaired
Financing Receivable, Recorded Investment [Line Items]
Total Loans	86,681	90,221
Purchased Impaired | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,944	8,654
Purchased Impaired | Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	27,438	25,644
Purchased Impaired | Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,565	17,335
Purchased Impaired | Multifamily Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	94	88
Purchased Impaired | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,579	2,156
Purchased Impaired | Residential 1-4 Family - Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	12,205	13,601
Purchased Impaired | Residential 1-4 Family - Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,713	16,872
Purchased Impaired | Residential 1-4 Family - Revolving
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,127	5,115
Purchased Impaired | Auto
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4	7
Purchased Impaired | Consumer and all other
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,012	749
Purchased Impaired | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	668	32
Purchased Impaired | Other Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	344	717
Purchased Impaired | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	32,922	35,658
Purchased Impaired | Pass | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,092	1,835
Purchased Impaired | Pass | Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	8,264	8,347
Purchased Impaired | Pass | Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,826	4,789
Purchased Impaired | Pass | Multifamily Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0
Purchased Impaired | Pass | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	127	762
Purchased Impaired | Pass | Residential 1-4 Family - Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,000	6,476
Purchased Impaired | Pass | Residential 1-4 Family - Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	9,947	9,930
Purchased Impaired | Pass | Residential 1-4 Family - Revolving
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,887	3,438
Purchased Impaired | Pass | Auto
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2	7
Purchased Impaired | Pass | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	657	17
Purchased Impaired | Pass | Other Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	120	57
Purchased Impaired | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	27,931	21,699
Purchased Impaired | Special Mention | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,692	1,308
Purchased Impaired | Special Mention | Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,524	6,685
Purchased Impaired | Special Mention | Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	9,415	7,992
Purchased Impaired | Special Mention | Multifamily Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	94	88
Purchased Impaired | Special Mention | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	25	134
Purchased Impaired | Special Mention | Residential 1-4 Family - Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,693	2,771
Purchased Impaired | Special Mention | Residential 1-4 Family - Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	557	1,030
Purchased Impaired | Special Mention | Residential 1-4 Family - Revolving
Financing Receivable, Recorded Investment [Line Items]
Total Loans	707	1,031
Purchased Impaired | Special Mention | Auto
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0
Purchased Impaired | Special Mention | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0
Purchased Impaired | Special Mention | Other Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	224	660
Purchased Impaired | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	25,828	32,864
Purchased Impaired | Substandard | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,160	5,511
Purchased Impaired | Substandard | Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	8,650	10,612
Purchased Impaired | Substandard | Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,324	4,554
Purchased Impaired | Substandard | Multifamily Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0
Purchased Impaired | Substandard | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,427	1,260
Purchased Impaired | Substandard | Residential 1-4 Family - Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,512	4,354
Purchased Impaired | Substandard | Residential 1-4 Family - Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,209	5,912
Purchased Impaired | Substandard | Residential 1-4 Family - Revolving
Financing Receivable, Recorded Investment [Line Items]
Total Loans	533	646
Purchased Impaired | Substandard | Auto
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2
Purchased Impaired | Substandard | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	11	15
Purchased Impaired | Substandard | Other Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0
Purchased Impaired | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Commercial Real Estate - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Commercial Real Estate - Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Multifamily Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Residential 1-4 Family - Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Residential 1-4 Family - Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Residential 1-4 Family - Revolving
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Auto
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Purchased Impaired | Doubtful | Other Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0