Annual report pursuant to Section 13 and 15(d)

LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding Purchased Impaired Loans) (Details)

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Loans Receivables Related Risk Rating Excluding 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    
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
Excluding Purchased Impaired    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 12,524,255 9,625,986
Excluding Purchased Impaired | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 12,142,328 9,344,002
Excluding Purchased Impaired | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 316,317 201,174
Excluding Purchased Impaired | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 65,252 80,810
Excluding Purchased Impaired | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 358 0
Excluding Purchased Impaired | Construction and Land Development    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,239,980 1,186,167
Excluding Purchased Impaired | Construction and Land Development | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,197,066 1,130,577
Excluding Purchased Impaired | Construction and Land Development | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 37,182 43,894
Excluding Purchased Impaired | Construction and Land Development | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 5,732 11,696
Excluding Purchased Impaired | Construction and Land Development | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,013,805 1,311,701
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,916,492 1,231,422
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 87,004 50,939
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 10,309 29,340
Excluding Purchased Impaired | Commercial Real Estate - Owner Occupied | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,271,533 2,450,075
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,205,463 2,425,500
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 62,368 17,648
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 3,608 6,927
Excluding Purchased Impaired | Commercial Real Estate - Non-Owner Occupied | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 94 0
Excluding Purchased Impaired | Multifamily Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 633,649 548,143
Excluding Purchased Impaired | Multifamily Real Estate | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 613,844 537,572
Excluding Purchased Impaired | Multifamily Real Estate | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 19,396 10,571
Excluding Purchased Impaired | Multifamily Real Estate | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 409 0
Excluding Purchased Impaired | Multifamily Real Estate | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Commercial and Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,112,454 1,314,979
Excluding Purchased Impaired | Commercial and Industrial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,043,903 1,273,549
Excluding Purchased Impaired | Commercial and Industrial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 60,495 34,864
Excluding Purchased Impaired | Commercial and Industrial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 8,048 6,566
Excluding Purchased Impaired | Commercial and Industrial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 8 0
Excluding Purchased Impaired | Residential 1-4 Family - Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 712,132 626,818
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 680,894 606,955
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 24,864 14,876
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 6,374 4,987
Excluding Purchased Impaired | Residential 1-4 Family - Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Residential 1-4 Family - Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 875,790 657,037
Excluding Purchased Impaired | Residential 1-4 Family - Consumer | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 841,408 624,346
Excluding Purchased Impaired | Residential 1-4 Family - Consumer | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 13,592 17,065
Excluding Purchased Impaired | Residential 1-4 Family - Consumer | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 20,534 15,626
Excluding Purchased Impaired | Residential 1-4 Family - Consumer | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 256 0
Excluding Purchased Impaired | Residential 1-4 Family - Revolving    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 655,377 608,268
Excluding Purchased Impaired | Residential 1-4 Family - Revolving | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 641,069 598,444
Excluding Purchased Impaired | Residential 1-4 Family - Revolving | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 6,373 6,316
Excluding Purchased Impaired | Residential 1-4 Family - Revolving | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 7,935 3,508
Excluding Purchased Impaired | Residential 1-4 Family - Revolving | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Auto    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 350,415 301,936
Excluding Purchased Impaired | Auto | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 345,960 296,907
Excluding Purchased Impaired | Auto | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 2,630 3,590
Excluding Purchased Impaired | Auto | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,825 1,439
Excluding Purchased Impaired | Auto | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 372,185 379,662
Excluding Purchased Impaired | Consumer | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 371,315 378,873
Excluding Purchased Impaired | Consumer | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 550 547
Excluding Purchased Impaired | Consumer | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 320 242
Excluding Purchased Impaired | Consumer | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 0 0
Excluding Purchased Impaired | Other Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 286,935 241,200
Excluding Purchased Impaired | Other Commercial | Pass    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 284,914 239,857
Excluding Purchased Impaired | Other Commercial | Special Mention    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 1,863 864
Excluding Purchased Impaired | Other Commercial | Substandard    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans 158 479
Excluding Purchased Impaired | Other Commercial | Doubtful    
Financing Receivable, Recorded Investment [Line Items]    
Total Loans $ 0 $ 0